Repeater Technologies OC80002 Distributed Antenna Systems User Manual users manual

Repeater Technologies Inc Distributed Antenna Systems users manual

users manual

OfficeCell Manual, Rev. E3

Operating Manual

OfficeCell



 Distributed Antenna System

iii

Table of Contents

1 LINK DESCRIPTION........................................................................................................................................1-1

1.1 CAUTIONS AND WARNINGS...........................................................................................................................1-1

1.2 GENERAL DESCRIPTION.................................................................................................................................1-1

1.2.1 Basic Principles ..................................................................................................................................1-2

1.2.2 Functional Description .......................................................................................................................1-3

1.3 SPECIFICATIONS............................................................................................................................................1-7

2 INSTALLATION ...............................................................................................................................................2-1

2.1 GENERAL PROCEDURE...................................................................................................................................2-1

2.2 INSTALL FIBEROPTIC CABLES ........................................................................................................................2-4

2.2.1 Minimizing Optical Reflections ..........................................................................................................2-4

2.2.2 Cleaning Optical Connectors..............................................................................................................2-5

2.3 SYSTEM ALARMS ..........................................................................................................................................2-6

2.4 HUB SHELF AND REMOTE POWER SUPPLY BATTERY CHARGE MONITORING AND BATTERY REPLACEMENT....2-6

2.4.1 Replacing the Hub Shelf Battery.........................................................................................................2-6

2.4.2 Replacing the Remote Power Supply Battery .....................................................................................2-7

2.5 INSTALLATION CHECKLIST............................................................................................................................2-7

2.5.1 Inspect Received Items........................................................................................................................2-7

2.5.2 Recommended Tools............................................................................................................................2-8

2.6 INSTALLING THE HUB SHELF..........................................................................................................................2-8

2.7 INSTALLING THE REMOTE TRANSCEIVERS......................................................................................................2-9

3 MONITORING AND TROUBLESHOOTING...............................................................................................3-1

3.1 FIELD SUPPORT NUMBERS .............................................................................................................................3-1

3.2 TROUBLESHOOTING TIPS...............................................................................................................................3-2

1-1

1 Link Description

1.1 Cautions and Warnings

Throughout this manual, these terms appear which highlight the care that should be exercised to ensure

personal safety and proper operation of the equipment.

WARNING: Warning statements identify conditions or practices

that could result in injury or loss of life.

CAUTION: Caution statements identify conditions or practices

that could result in damage to this product or other property.

NOTE: this equipment has been tested and found to comply with the limits for a Class B digital

device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable

protection against harmful interference in a residential installation. This equipment generates, uses

and can radiate radio frequency energy and if not installed and used in accordance with the

instructions, may cause harmful interference to radio communications. However, there is no

guarantee that interference will not aoccur in a particular installation. If this equipment does cause

harmful interference to radio or television reception, which can be determined by turning the

equipment off and on, the user is encouraged to try to correct the interference by one or more of the

following measures:

- Reorient or relocate the receiving antenna

- Increase the separation between the equipment and receiver

- Connect the equipment into an outlet on a circuit different from that to which the receiver is

connected

- Consult the dealer or an experienced radio/TV technician for help.

CAUTION: any modifications to this device not expressly

authorized by Repeater Technologies, Inc. could void the user’s

authority to operate this device.

1.2 General Description

The OFFICECELL Fiberoptic Distributed Antenna System provides extended coverage of cellular and PCS

networks throughout buildings and campus environments. The Hub Shelf is the HUB SHELF which is a 3U

(5.25 inch) high, 19 inch wide rack-mounted chassis. The HUB SHELF holds up to 8 HUB TRANSCEIVER

Plug-Ins. The Hub Shelf is located in a communications equipment room in the building and is connected to

the cellular/PCS base station or repeater via hardline connection. The Hub Shelf may also be connected to

the radios of a wireless PBX. Each Hub Shelf is configured with up to eight HUB TRANSCEIVER plug-in

cards. Each card is connected to up to two Remote Transceivers. The REMOTE TRANSCEIVER Units are

1-2

distributed throughout the building as necessary to provide coverage. The Remote Transceivers are mounted,

generally, above the suspended ceiling but may be mounted near the ceiling inside the room if need be. The

aesthetic and low-profile design of the Remote Power Supply makes it relatively unobtrusive. The plastic

cover may even be removed and/or painted to match the décor. Each REMOTE TRANSCEIVER is

connected to Hub Shelf via two singlemode optical fibers. Each REMOTE TRANSCEIVER has one RF port

which is connected to a user-supplied indoor coverage antenna. This port may also be routed through an N-

way RF splitter to provide coverage from a number N antennas for the one Remote Transceiver. This reduces

the output power and sensitivity at that Remote Transceiver but, in some cases, this could be the most cost-

effective way to provide unifirm coverage. The REMOTE TRANSCEIVER is powered by +12 to 24 VDC

which can be supplied by the customer or by the Remote Power Supply. This is a universal AC power supply

with battery backup and is installed with the REMOTE TRANSCEIVER on a wall mounting bracket supplied

with the unit. If DC power is supplied by the customer, it can be distributed from a power supply at the Hub

location using the conductor pairs in a composite fiber/conductor cable. The DC connector utilized at the

Remote Transceiver can accommodate up to 14 AWG wire.

The OFFICECELL design is very versatile but certain options are available that target specific signal types

and applications. In addition to the single band versions, there is an 800 MHz/1900 MHz dual band and a

GSM900/GSM1800 dual band option. There is also a high power 800MHz and GSM900 option. This option

provides a +22 dBm single carrier output for GSM900 or, for 800 MHz, 10 carriers of IS-136 at +10

dBm/carrier or +12 dBm for single carrier CDMA. The system performance is specified for 4 dB optical

loss.

OFFICECELL installation and setup is very simple. First, standard telcom grade singlemode fiberoptic cable

that is most suitable for the site is installed. The cable installer can terminate the cable on site easily with the

OptoClip optical connectors. The Plug-Ins and Remote Transceivers of a given type are completely

interchangeable. The OptoClip plugs directly into the Remote Transceiver at one end. The other end plugs

into an optical patch panel or directly into the Hub Shelf via an OptoClip-to-SC/UPC adapter. If the patch

panel is used, OptoClip-to-SC/UPC jumpers must be used to connect the HUB SHELF to the patch panel.

Built-in optical loss compensation automatically equalizes the gain in both the transmit and receive paths so

the transmit RF power is known for a given input RF power and the receive path sensitivity is optimized. The

only adjustment available is a manual setting for the static transmit power at the Remote Transceiver which

may be used to optimize coverage, if necessary. This is a one time adjustment during set up.

1.2.1 Basic Principles

The OFFICECELL

operation is based on an

analog RF fiberoptic link.

The principles are

illustrated in Figure 1.

Input RF signals are

converted to light by

direct intensity

modulation of a

semiconductor laser. This

modulated light is

transmitted over optical

fiber and detected by a

semiconductor PIN

photodiode. The

photodiode converts

optical power to

electrical current. This

current is AC coupled

Figure 0. Laser diode and photodiode characteristics illustrating the

eration of an analo

fibero

tic link.

bias

I (mA) I (mA)

P (mW)

out

Input

Output (ac coupled

to remove dc component)

Optical

Output

Opti ca

Input

P (mW)

LASER DIODE

CHARACTERISTIC PHOTODIODE

CHARACTERISTIC

1-3

and passed through a load to recover the RF signal.

The basic RF loss in this link is determined by the inefficiencies of the conversions of RF to optical and

back. The fiber also contributes an RF loss equal to twice the optical loss. This is because the photodiode

converts optical power to electrical current and RF power is proportional to the square of the current. So,

for 1 km of fiber with a loss of 0.4 dB/km (this is typical at 1310 nm wavelength) the optical loss is 0.4 dB

and the contribution to the RF loss is 0.8 dB. In a real installation, two optical connectors will add

approximately 0.5 dB of optical loss.

The laser and, to a much lesser degree, the photodiode, add noise and distortion to the RF signal. This RF

performance is characterized just as any RF link in terms of dB loss, noise figure, third order intercept, etc.

The fiber path itself can contribute noise and distortion. In the OFFICECELL, the laser used is a Fabry-Perot

(FP) laser instead of a Distributed Feedback (DFB). The DFB has a single spectral component. The FP laser

has multiple spectral components which can contribute noise and distortion for longer fiber runs. For the

distances used in the OFFICECELL, this effect is not significant. Also, optical backscattering back into the

laser from less than perfect connections can cause additional noise and distortion. The FP lasers used in the

OFFICECELL are much less sensitive to this than are DFB lasers. DFB lasers are also considerably more

expensive. However, if optical reflections are severe enough from a bad connection, the resulting optical

reflection may cause performance degradation. To minimize this, SC/UPC optical connectors with a return

loss > 50 dB are used at the Hub Shelf and OptoClip connectors with a return loss of > 60 dB are used at the

Remote Transceiver. Following standard practices in cleaning of the removable optical connectors (see

procedure outlined below) will keep the connections in spec and will avoid the problems of performance

degradation.

1.2.2 Functional Description

The OFFICECELL Fiberoptic Antenna System connects to the mobile coverage RF ports of a repeater or

Figure 2. System Block Diagram

1-4

base station as an extended coverage antenna. The Hub Shelf mounts in a standard 19 inch rack close to the

repeater or base station transmit and receive RF ports. These RF connections are made via the RF connectors

on the rear panel. Inside the chassis, the transmit signal is split and routed to the Hub Transceiver Plug-Ins.

Each plug-in is a fiberoptic transceiver. The Hub Shelf holds up to eight plug-ins. Each plug-in interfaces

with up to two Remote Transceivers by way of fiberoptic connections on the Hub Shelf rear panel.

The HUB TRANSCEIVER Plug-Ins are connected to the Remote Transceivers via singlemode fiber at 1310

nm wavelength. Separate fibers are needed for the transmit and receive signals. SC/UPC optical connectors

(SC/PC snap-in connectors with an “ultra-polish”) are used at the Hub Shelf. These connectors are used

because they are compatible with the optical blindmate connectors used on the HUB TRANSCEIVER Plug-

Ins. The bulkhead connectors are polished to a return loss of > 50 dB.

The Remote Transceiver is a fiberoptic transceiver that connects to an external indoor coverage antenna.

Depending on coverage and cost requirements, an RF splitter may be used to connect the Remote Transceiver

to two or more antennas. The Remote Transceiver uses field-installable OptoClip II optical connectors. The

Remote Transceiver optical output is the green connector. The REMOTE TRANSCEIVER units are generally

mounted above the false ceiling on a bulkhead or post. Each REMOTE TRANSCEIVER is connected to an

indoor coverage antenna by way of a customer-supplied flexible RF cable. Some indoor antennas are

available with flexible RF cable pigtails and an SMA connector termination. These units are distributed

throughout the building or campus as necessary to get full coverage. After installation, the transmit power

from each Antenna Unit may be adjusted manually by way of an potentiometer on the unit. This is

Figure 3. OfficeCell RF Path Block Diagram.

1-5

Figure 4. The Remote Transceivers are normally mounted

above the false ceiling but may be mounted in the room.

Each Remote Power Supply is connected to the Hub Shelf

via 2 singlemode fibers. The Remote Power Supply is

connected to a user-supplied antenna via flexible RF cable.

The Remote Transceivers may be powered using the

optional universal Remote Power Supply with battery

backup, or using a central power supply that distributes DC

power along with the fiber over a composite fiber/conductor

potentiometer indented in 2 dB steps. This is a one time adjustment. For dual band units, there is a separate

adjustment for each band.

Several versions of the REMOTE TRANSCEIVER are available that are optimized for specific formats such

as DAMPS, GSM900, GSM1800, etc. Dual band versions are available; one providing simultaneous

coverage for GSM900 and GSM1800 and one for PCS1900 and 800 MHz. In these versions, a single RF port

feeds a dual band antenna.

The block diagram of the OFFICECELL Fiberoptic Antenna System is shown in Figures 2 and 3. The input

transmit RF signal is split eight ways in the Hub Shelf. Each of these signals is routed to a Hub Transceiver

Plug-In where it is split in two and each path modulates the optical output of a solid state laser diode. This

optical output is routed through a

singlemode optical fiber to one Remote

Transceiver. The photodiode in the

REMOTE TRANSCEIVER detects this

optical signal and outputs a proportional

electrical current. This current is ac

coupled and passed through a load to

recover the RF signal. The RF signal is

amplified, filtered and output to the

antenna. The output RF signal path

includes a variable attenuator to adjust

the output level for optimum coverage.

The RF subcarrier is detected at the

photodiode output. This level is used by

the transmit AGC to set the downlink

gain. The subcarrier is also amplified and

inserted into the uplink path. This signal

is detected at the Hub Shelf Plug-In for

the uplink AGC and Node Function

Alarm. A failure of any amplifier in the

downlink path in the Remote Transceiver,

shuts off the subcarrier in the return path

which, in turn, triggers the Node Function

Alarm at the Hub.

The receive or uplink RF signal from the

antenna is filtered and amplified then

routed to the Remote Transceiver laser.

A fast ALC is included in this path which

prevents RF overdrive damage to the

laser while recovering fast enough to

minimize blocking for TDMA and GSM

signals. The laser output in the Remote

Transceiver is then modulated by the

receive RF signal and is transmitted

through another singlemode optical fiber

back to the Hub Shelf Plug-In. Each of the

two photodiodes in the Hub Transceiver

Plug-In recovers the RF signals from

each of two Remote Transceivers. The

pilot tone on each signal is split off and

detected. This is used for the Node

Function alarm. This LED is normally

green and turns red if the pilot tone is not

detected. This alarm also appears at the

1-6

Hub Shelf rear panel DB37 connector as a TTL level critical alarm. It would also be reported to the NOC or

service technician by the modem card depending on how the user configured the system alarms.

The receive RF signal from each photodiode is combined in the HUB TRANSCEIVER Plug-In. These

combined outputs are combined again in the and output to the rear panel RF uplink connectors. The Hub Shelf

is divided into two halves. The RF signals from each half are combined and routed to separate rear panel N

connectors. The combined uplink signals from one half can be routed to the BTS main receive port while the

other RF output is routed to the BTS receive diversity port. This method provides an overall 3 dB system

sensitivity improvement compared to routing all of the uplink signals into one receive port (see Figure 2).

Alternatively, both outputs may be combined and routed to a single BTS receive port.

1-7

1.3 Specifications

Description

This specification defines the uplink and downlink performance of the OfficeCell Fiberoptic Antenna System.

The terminal equipment consists of the Remote Transceiver and the Hub Transceiver Plug-In. The latter is

installed in the Hub Shelf. This system meets and exceeds the requirements for GSM900, GSM1800 and

GSM1900 Class M3 micro-BTS as well as IS-136 TDMA and IS-95 CDMA for wireless PBX, in-building

and campus coverage applications.

There are four frequency options for the OfficeCell: 850 MHz (AMPS), GSM900, GSM1800 and PCS1900.

There are two downlink output power options: the P1 power option meets GSM 900 micro-BTS M3

requirements and is available for the 850MHz and 900MHz versions only. The P2 power option meets

micro-BTS M3 requirements for 1800MHz and 1900MHz. For 850MHz and 900MHz, the High Power meets

GSM micro-BTS power class M1 requirements and IS-136 in-building requirements for +20 dBm composite

power. All of these system standards specifications are met for optical loss of up to 4 dB.

RF Parameters (up to 4 dB optical loss)

Uplink

Frequency Range 850 MHz 824 - 849 MHz

GSM900 890 - 915 MHz

GSM1800 1710 - 1785 MHz

PCS1900 1850 - 1910 MHz

Amplitude Flatness

824 – 849, 890 - 915 MHz; Full band ± 1.5 dB

(Any 15 MHz band) ± 1.0 dB

1710 – 1785, 1850 - 1910 MHz; Full band ± 2.5 dB

(Any 15 MHz band) ± 1.0 dB

Noise Figure ≤ 13 dB

Low Noise Option ≤ 7 dB

Input Third Order Intercept (IIP3), 2 carriers, -43 dBm/carrier ≥ -15 dBm

Low Noise Option ≥ -25 dBm

Link Gain (with external 20 dB attenuator; 30 dB attenuator with Low Noise Option)

824 - 915 MHz 4 ± 1 dB

1710 - 1910 MHz 4 ± 1 dB

Uplink Input ALC

Input RF Threshold - 25 dBm

Low Noise Option -35 dBm

Range 30 dB

Response Time < 5 µsec w/o ringing

Gain Stability ± 1 dB

Input/Output Impedance 50 Ω

Input/Output VSWR ≤ 2 : 1

Downlink

Frequency Range 850 MHz 869 - 894 MHz

GSM900 935 - 960 MHz

GSM1800 1805 - 1880 MHz

PCS1900 1930 - 1990 MHz

Amplitude Flatness

1-8

869 – 894, 935 - 960 MHz; Full band ± 2.5 dB

(any 15 MHz band) ± 1.0 dB

1805 – 1880, 1930 - 1990 MHz; Full band ± 2.5 dB

(any 15 MHz band) ± 1.0 dB

Output Noise ≤ -92 dBm/Hz

Output Third Order Intermodulation Product

(Interfering CW carrier 30 dB below main carrier,

for single carrier at max output power) ≤ -38 dBm

2 Equilevel Carriers at +17 dBm/carrier ≤ -42 dBc

Output Power, Maximum (dBm)

Std Single Carrier 2 Equilevel Carriers

(Power/Carrier)

GSM +14 +5

IS-136 +12 +9

CDMA +4 +1

GSM +22 +13

IS-136 +20 +17

CDMA +12 +9

Output Power Range ≥ 12 dB user adjustable (in 2 dB

increments at TR102 Remote

Transceiver)

Input Power Threshold for Input Power Protect 8.5 to 11.5 dBm

Attenuation Step for Input Power Protect 10 dB

Gain at Maximum Output Power (output attenuator set at min)

Output Power Option P1 2 ± 1 dB

Output Power Option P2 14 ± 1 dB

Gain Stability ± 1 dB

Input/Output Impedance 50 Ω

Input/Output VSWR ≤ 2 : 1

General

Loop back Carrier Frequency 99 MHz ± 10 MHz

Optical Parameters

Wavelength 1310 ± 20 nm

Output Power

Remote Transceiver 1.8 mW

Hub Transceiver Plug-In 1.8 mW

Optical Connector

Hub Shelf SC/UPC, > 50 dB return loss

Remote Transceiver Optoclip II®, > 55 dB return loss

Fiber Singlemode

Absolute Maximum Ratings

RF Input Power

Uplink +5 dBm

Low Noise Option -5 dBm

Downlink +26 dBm total

Photodiode Input Optical Power +2.3 mW

1-9

Electrical

Remote Transceiver +12 V to +24 V, 12 W (single

band), 20 W (dual band)

Remote Power Supply 100 to 240 VAC, 47 – 63 Hz

Hub Transceiver Plug-In 6 W

Hub Shelf 100 - 240 VAC, 47 - 63 Hz

1-10

Mechanical

Remote Transceiver See outline drawing below

1-11

Hub Shelf Plug-In (HUB TRANSCEIVER) Plug-in card with 5.06” H x 1.2” W front

panel for HUB SHELF Chassis.

Hub Shelf (HUB SHELF) 19”, 3U (5.25”) H, 15.75” D rack mount

1-12

1-13

Alarms and Monitors

Remote Transceiver

Description

Power On (Green LED)

Laser Optical Power Low Alarm (active if laser output < 90% of factory set point:

Red Front panel LED)

Received Optical Power Low Warning (active if optical loss > 4.2 dB: Yellow

front panel LED)

Transmit Amplifier Failure Alarm (active if any amplifier in transmit path fails as

detected by bias current: Red LED. Also causes shutoff of subcarrier in uplink path

which triggers Node Function Alarm at plug-in.)

Hub Transceiver Plug-In Node Function (loopback carrier detect:

Front panel LED; normally Green, Red if RF

subcarrier level drops more than 10 dB)

Received Optical Power Low Warning

(active if optical loss > 4.2 dB: Yellow front

panel LED, normally OFF)

Laser Optical Power Low Alarm (active if

laser optical output power drops 10%): Red

Front panel LED, normally OFF)

Hub Shelf

LEDs Power On (Green, Normally ON)

Main Power Alarm (Red Front panel LED;

normally OFF)

Backup Power Alarm (Red Front panel LED;

normally OFF)

Battery Alarm (Yellow front panel LED,

active if battery backup charge is low;

normally OFF)

Alarms, Rear Panel DB-37 (See Table) Critical Alarms: these include all Node

Function Alarms and the Main and Backup

Power Supply Alarms.

Summary Contact Closure Alarm: active if

any alarm is active in chassis or plug-ins.

RepeaterNet Any critical alarm prompts the system to dial up

Remote Power Supply NOC. This is configured at

installation with a laptop computer via the front panel

Craft interface. Dial up connection is made with RJ-11

interface on rear panel. The system may also be polled

through dial up connection to get status of all alarms

and warnings.

Craft Interface (Front Panel) Used to set up RepeaterNet interface.

Includes setting telephone number of master Hub Shelf

as well as the NOC or service pager. Also configures

Hub Shelf as master or slave. Master provides dial up

1-14

connection for itself and daisy-chained slave units.

Connection to slave units via RJ-45 jacks on rear.

DB-37 Pin Signal name Type Sense

1 1-A Node Function Alarm TTL Active Low

2 2-A Node Function Alarm TTL Active Low

3 3-A Node Function Alarm TTL Active Low

4 4-A Node Function Alarm TTL Active Low

5 5-A Node Function Alarm TTL Active Low

6 6-A Node Function Alarm TTL Active Low

7 7-A Node Function Alarm TTL Active Low

8 8-A Node Function Alarm TTL Active Low

9 Master P.S. Alarm TTL Active Low

10 Battery Alarm TTL Active Low

11 n.c.

12 n.c.

13 n.c.

14 n.c.

15 RTN

16 RTN

17 RTN

18 n.c.

19 n.c.

20 1-B Node Function Alarm TTL Active Low

21 2-B Node Function Alarm TTL Active Low

22 3-B Node Function Alarm TTL Active Low

23 4-B Node Function Alarm TTL Active Low

24 5-B Node Function Alarm TTL Active Low

25 6-B Node Function Alarm TTL Active Low

26 7-B Node Function Alarm TTL Active Low

27 8-B Node Function Alarm TTL Active Low

28 Back-up Power Supply Alarm TTL Active Low

29 n.c.

30 n.c.

21 n.c.

32 n.c.

33 n.c.

34 Summary Alarm N.C. Relay contact Connect to Common if O.K.

35 Summary Alarm Common Relay contact

36 Summary Alarm N.O. Relay contact Open if O.K.

37 n.c.

1-15

Environmental

Operating (ETSI EN 300 019-1-3)

Temperature Range +5 to +45ΕC

Rate of Temperature Change 0.5 °C/minute

Relative Humidity 5 to 85% RH, non-

condensing

Storage and Transportation

(ETSI 300 019-1-1 STORAGE, class 1.2)

(ETSI 300 019-1-2 TRANSPORTATION, class 2.3)

Temperature Range -40 to +70°C

Rate of Temperature Change 0.5°C/minute

Relative Humidity 10 to 100%

Vibration (Storage)

Vibration Test (Transportation)

Shock Test (Transportation)

Drop Test (Transportation)

Free Fall 30 - 40 0.4 1 on each face or 2 in normal attitude

Free fall 40 - 50 0.3 1 on each face or 2 in normal attitude

Regulatory UL, CSA, FCC Type

Acceptance for 800 MHz

and PCS versions.

CE Mark for GSM900 and

GSM1800 versions

PARAMETER FREQUENCY RANGE SEVERITY DURATION

(Hz) Vel; mm/s Accel; m/s2

Sinusoidal 5 – 62 5.0 3x5 sweep cycles

Sinusoidal 62 - 200 2 3x5 sweep cycles

PARAMETER FREQUENCY RANGE SEVERITY DURATION

(Hz) ASD: m2/s3Rolloff: dB/oct

Random 5 – 20 0.96 3 x 10 mins

Random 20 - 500 -3 3 x 10 mins

PARAMETER SHOCK SPECTRUM SEVERITY DURATION

(Hz) Accel: m/s2Number ms

Shock (m≤100kg) Half Sine 400 500 in each of

6 directions

1000 in

normal

attitude

PARAMETER MASS DROP HEIGHT NUMBER OF DROPS

(kg) (m)

Free Fall < 30 0.5 1 on each face or 2 in normal attitude

2-1

2 Installation

2.1 General Procedure

Before installing and, in fact, before even receiving the OfficeCell units, one can have the fiberoptic cables

installed and tested. The network planning has been completed which has determined the type, number and

location of Remote Transceivers needed for optimum coverage and capacity.

Install and check the fiberoptic cables first. Use any high quality, telcom grade singlemode fiberoptic cable.

The OptoClip II optical connectors are installed easily on site (contact Molex or Huber+Suhner for

installation kits and training for the OptoClip II). General practice is to terminate the fiberoptic cables at a

patch panel near the Hub Shelf. In this case, optical jumper cables will be needed to make the connection

between the patch panel and the Hub Shelf. These jumpers will be terminated with an OptoClip II connector

at one end and an SC/UPC at the other.

! Make sure to specify SC/UPC, not SC/PC. The standard SC/PC has an optical return loss < 27 dB

which can cause degradation of the system noise performance. SC/UPC specifies an “ultra” polish for

a return loss > 50 dB.

During this process, label each cable at each end to indicate whether it is transmit or receive and which

Remote Transceiver it is associated with. It is good practice to pull one or two additional fiber pairs to each

Remote Transceiver to allow for future expansion. Next, mount the Hub Shelf in the rack and connect the

fiberoptic cables. Do not connect the RF cables yet.

Mount the Remote Transceivers. Install the wall mounting brackets first. For mounting above a false ceiling,

orient the bracket so that the end of the Remote Transceiver with the connectors is pointing downwards.

When mounting inside the room, place the Remote Transceiver near the ceiling with the connectors pointing

upwards. This permits the most aesthetic routing of the cables. The plastic cover on the Remote Transceiver

may be removed by loosening the four screws on the back of the Unit. This permits the user to paint the cover

to match the room décor. If the REMOTE TRANSCEIVER is to be installed with the Remote Power Supply,

install the two mounting brackets next to each other linking them with the connector piece supplied with the

power supply mounting bracket. This will give the most aesthetic mounting with the proper spacing for an

easy DC power connection. Orient the bracket so that the threaded tab will be at the same end as the

connectors on the REMOTE TRANSCEIVER. Place the REMOTE TRANSCEIVER so that the rear panel

studs slide into the keyhole slots on the mounting bracket. Secure the unit by tightening the captive

thumbscrew on the REMOTE TRANSCEIVER to the threaded hole in the mounting bracket. The Remote

Power Supply installs in the same way. For the Remote Power Supply, if the red NO AC LED is on, press the

reset switch located next to the AC power connector which turns off the battery backup (when the mains is

not connected). For AC powered units, connect the AC power cords to the building mains according to local

building electrical codes. Connect DC power to the REMOTE TRANSCEIVER by connecting the shielded

cable with the twinax termination to the DC input connector on the REMOTE TRANSCEIVER.

Mount the indoor coverage antenna to the ceiling or wall as needed and connect it to the Remote Transceiver

with a flexible RF cable. The RF cable must have an SMA male connector for the connection to the Remote

Transceiver. If the antenna has a different RF connector, say, N or TNC, an RF adapter must be used. Plug in

the transmit (downlink) fiberoptic cable connector into the OPTICAL IN on the Remote Transceiver and the

receive (uplink) fiberoptic cable connector into the OPTICAL OUT (Green) on the Remote Transceiver.

From the initial network design, the output power required from each Remote Transceiver should be known.

This can be preset before power is turned on by turning the Output Power adjustments on each Remote

2-2

Transceiver. From the maximum output power rating for each Remote Transceiver, the power can be reduced

in 2 dB using the indented potentiometer.

Turn the power on to the Remote Transceivers and on the Hub Shelf. Proper operation of the optical system

is indicated by a green Node Function LED on each of the Hub Transceiver Plug-Ins that is connected to an

active Remote Transceiver. All other alarm indicators should be OFF. A yellow LED at the plug-in or at the

Remote Transceiver indicates that the optical loss in that path is > 4 dB and is, therefore, out of the range of

the guaranteed specification.

Before connecting the Hub Shelf to the BTS or Repeater, check that the RF transmit power from the source

(BTS or repeater) is within the safe operating range of the OFFICECELL and that it is at the level required

for proper noise and distortion performance according to the network design (see Table 1).

Table 1. Transmit (Downlink) Input RF Levels/carrier

GSM (05.05) TDMA (IS-136) CDMA (IS-95)

+12 dBm, 1 carrier +11 dBm, 2 carriers +3 dBm, 1 carrier800MHz/900MHz

Power P1 (2 dB gain) +4 dBm, 2 carriers +8 dBm, 4 carriers 0 dBm, 2 carriers

+8 dBm, 1 carrier +3 dBm, 4 carriers -2 dBm, 1 carrier

-1 dBm, 2 carriers 0 dBm, 8 carriers -5 dBm, 2 carriers

GSM1800/1900MHz,

800MHz/GSM900

Power P2 (14 dB gain) -4 dBm, 4 carriers -3 dBm, 10 carriers -8 dBm, 4 carriers

Connect the RF cables between the BTS or repeater and the Hub Shelf. The Remote Transceivers and the

plug-ins have been calibrated at the factory and the optical loss compensation in each Remote Power Supply

and plug-in automatically equalizes the gain in each link so that the specified link gain is always met. The

system is now operational and no further adjustment is necessary.

2-3

2-4

2.2 Install Fiberoptic Cables

Once the location for each of the Remote Transceivers has been determined, the fiberoptic cable can be

installed between the Hub Shelf and these locations. The cable length can be up to 5 km.

You need to know the following:

Optical Fiber Singlemode, 1310nm wavelength

Optical Loss Good quality fiber should have an optical loss of <

0.4 dB/km at 1310nm. There will be additional optical

loss due to connectors and splices but there should be

no more than about 0.5 dB loss through a connector

mating (optical connections are sexless) and less

through a splice.

Optical Connectors OptoClip II® connectors. These connectors are easily

installed on site. Contact Molex or Huber+Suhner for

installation kits and training. The Hub Shelf uses

SC/UPC connectors so an OptoClip-to-SC/UPC

adapter must be used. Alternatively, connect the Hub

Shelf to an OptoClip patch panel using optical jumpers

with an OptoClip termination at one end and an

SC/UPC termination at the other. IMPORTANT

NOTE: MAKE SURE TO USE AN SC/UPC

TERMINATION: THIS CONNECTOR IS AN

“ULTRA-POLISHED” CONNECTOR WITH AN

OPTICAL RETURN LOSS > 50 dB. A STANDARD

SC/PC TERMINATION HAS A HIGH RETURN

LOSS AND WILL DEGRADE LINK NOISE AND

LINEARITY PERFORMANCE.

Once the cable has been installed, the installer should check the quality of the optical path using an Optical

Time Domain Reflectometer (OTDR). This will check the optical path loss and the magnitude and location of

any reflections. The total return loss should be > 45 dB.

While checking the cables in this way, it is useful to label each cable near the connector as to which Remote

Transceiver it is for and whether it is for the transmit or receive path. Labelling the cable in this way permits

complete interconnection during installation with the system powered off. Otherwise, the Remote

Transceivers will have to be installed with the Hub Shelf power on with all fiberoptic cables connected to it.

This allows the installer to check which fiber is transmit by using an IR sensitive card (see Recommended

Tools).

2.2.1 Minimizing Optical Reflections

As discussed in the Functional Description, optical reflections can degrade the noise and linearity of a

fiberoptic link. In particular, reflections that reach the laser can be a problem. Keep all discrete reflections to

> 45 dB. For the Hub Shelf, the SC/UPC connectors are polished to a return loss >50 dB. At the Remote

Transceivers, the OptoClip connectors have a return loss of > 55 dB.

2-5

2.2.2 Cleaning Optical Connectors

Optical reflections from a discontinuity such as a poor connector interface appear on an RF spectrum

analyzer trace as stable variations in the noise floor amplitude that are periodic with RF frequency. If the

reflection is bad enough, it could impact the system performance. By far, the most common cause for a large

discrete reflection is a dirty optical connector. Remember that the optical aperture at the tip of the fiberoptic

connector is only 9 :m in diameter. A bit of dust or oil from a finger can easily interfere with or block this

light. Fortunately, it very easy to clean the connector. The procedures are indicated in the Figure. Be sure to

use the correct procedure for the given connector. When disconnected, cap the SC/UPC connector to keep it

clean and prevent scratching the tip of the ferrule. The OptoClip is “self-capping”.

Figure1. Keeping the tip of the optical connectors clean is a simple way to ensure optimum system

erformance.

2-6

2.3 System Alarms

The OfficeCell has three ways of indicating alarms.

1. LEDs: the Hub Shelf and the Remote Transceiver have status indicators for power on and alarm

conditions.

2. Hub Shelf Rear Panel DB37 Connector: The “critical” alarms are available here as TTL levels.

In addition, three pins provide a contact closure summary alarm (see Alarms in the

specifications).

3. Modem connection: The system status may be monitored locally with a computer through the

front panel Craft port. The main purpose of this port is to set the system initially. This includes

specifying which alarms are critical, setting the local system telephone number and specifying

the action to be taken when there is a critical alarm (dial up the NOC or a service technician’s

pager). With the RepeaterNet OA&M software, up to 5000 systems can be Remote Power

Supplyly monitored.

Using the alarms provided, the cause of a critical failure can be determined with high confidence. For

instance, if the Node Function alarm is associated with a Plug-In laser alarm, the Plug-In has failed and must

be replaced. If the Node Function alarm is associated with a Received Optical Power Low at the Plug-In,

either the Remote Transceiver laser has failed or the fiberoptic cable has been broken or damaged. The

service technician would come with a replacement Remote Transceiver. If, upon inspecting the Remote

Power Supply in question, the LEDs indicate no failure, the fiber path would have to be inspected. This

should be relatively easy to track down since damage would have to be associated with some other work

going on at the site or someone had deliberately disconnected the optical cable from the unit. Finally, a Node

Function alarm not associated with any other alarm at the Hub Shelf would indicate a failure of the Remote

Transceiver downlink amplifier chain. This would be confirmed by inspection of the Remote Power Supply

in question for that particular LED. The complete troubleshooting matrix is given at the end of this manual

and can be used to program the OA&M software to recommend the proper action to be taken.

2.4 Hub Shelf and Remote Power Supply Battery Charge Monitoring and

Battery Replacement

Both the Hub Shelf and the Remote Power Supply have a battery backup. While connected to mains power,

the battery is kept charged by a charging circuit. Once AC mains power is first connected, the charging circuit

waits 48 hours before starting the battery test circuit. This circuit checks to open circuit battery voltage every

ten seconds. Once the circuit detects the battery voltage drops below approximately 12 Volts, the BATT

LOW alarm is activated. At the beginning of life, the battery provides approximately 15 to 20 minutes of

system backup. At end of life, the backup time is about 8 to 10 minutes. It is expected that the batteries

should be replaced every 1.5 to 2 years.

2.4.1 Replacing the Hub Shelf Battery

The battery must be replaced with the AC mains power off.

1. Turn off the AC mains power (rear panel switch)

2. Disconnect AC mains power cable

2-7

3. Press the BATT OFF switch on the rear panel to switch off the battery power to the Hub Shelf

4. Pull the Hub Shelf out of the rack from the front on the chassis rack mount slides. Be careful not

to pull on rear panel cable assemblies, especially the fiberoptic cables.

5. Remove the Hub Shelf top cover.

6. Locate the battery on the left behind the power supplies.

7. Remove the battery bracket by loosening the screws. Lift off the bracket.

8. Disconnect the battery terminal wires by pulling them off.

9. Lift the battery out.

10. Install the replacement battery by reversing the process.

2.4.2 Replacing the Remote Power Supply Battery

The battery must be replaced with the AC mains power off.

1. Disconnect the AC mains power cable.

2. Press the BATT OFF switch on the power supply to switch off the battery power.

3. Disconnect the DC power connector from the Remote Transceiver.

4. Loosen the thumbscrew that secures the power supply to the mounting bracket.

5. Slide the power supply housing so as to release from the mounting bracket keyhole slots.

6. Remove the smaller cover on the back of the housing (the far end from the connectors).

7. Lift out the battery and pull off the terminal wires.

8. Install the replacement battery by reversing the process.

2.5 Installation Checklist

Once the fiberoptic cable has been installed properly, the OfficeCell installation and set up is simple.

2.5.1 Inspect Received Items

Packing List Checklist (as applicable)

!Hub Shelf w/mounting hardware and AC power cord

! Hub Transceiver Plug-In (s); these are installed in the chassis unless they are spares

! Plug-In Termination Cards: these are plug-ins behind blank front panels installed on unused slots.

They provide 50Ω RF terminations to the internal RF splitters and combiners ensuring a balanced

load.

! Two 1:2 RF splitter/combiners (supplied with the Hub Shelf)

! Remote Transceiver (s): These will be in a separate box.

! Remote Power Supplies (not included if user is supplying DC power to REMOTE

TRANSCEIVER).

! Mounting Brackets for REMOTE TRANSCEIVER and REMOTE POWER SUPPLY. Included with

REMOTE TRANSCEIVER and REMOTE POWER SUPPLY.

!1 Operating Manual

Inspect all received items thoroughly. If any item has been damaged during shipping, report it to

the shipping company and to Repeater Technologies in the U. S. at 408-747-1946. Also, contact the

factory immediately if any item is missing.

2-8

2.5.2 Recommended Tools

!OptoClip II installation kit

!Fiberoptic Connector Cleaning Kit: For the SC/UPC: cotton swabs, alcohol, For the OptoClip:

OptoClip cleaning tool

!IR sensitive card: used to detect active laser port and active fiber. (eg. Quantex Model Q-42-R)

!Small screwdriver or Adjustment Tool for transmit output power potentiometer

! Screwdriver for mounting chassis in rack and Remote Transceivers on the wall

! 4 #6 panhead or M3.5 mounting screws for each Remote Transceiver.

! Appropriate screws, washers and mounting hardware for rack mounting the Hub Shelf.

2.6 Installing the Hub Shelf

The Hub Shelf mounts in a standard 19 inch rack close to the RF source (BTS or repeater). The chassis

should be supported at the sides as well as from the front flanges. The HUB SHELF 3U high chassis is

available with rails. Before turning on the AC (or DC) power to the chassis, connect the fiberoptic cables at

the rear panel.

During installation of the fiberoptic cables, each fiber should have been labelled as to which Remote

Transceiver it is to be connected to and whether it is for transmit or receive. The transmit or downlink fibers

are connected to the optical outputs on the rear panel. These are the red connectors with the laser light

warning labels. Make sure that the connectors used are associated with an active plug-in installed in the

chassis.

For ease of installation, the cable has been terminated with the OptoClip optical connector. The optical

IN RF

OUT RF

OUT

Alarms

The cable clam

s at each corner

of the rear panel ease cable

management and help protect

the optical connectors from undue

strain.

The minimum bend radius of

the fiber is 2 inches (5 cm). Do

The optical connector for the

transmit (downlink) path

is red with the laser warning

label. The black connector

is for the receive path.

Figure 0. Connecting Fiberoptic Cables to Hub Shelf.

2-9

connectors for the Hub Shelf are SC/UPC so an OptoClip-to-SC/UPC adapter must be used. Alternatively,

use optical jumpers with an SC/UPC termination at one end and an OptoClip at the other to connect the Hub

Shelf to an optical patch panel (recommended). First, clean the tip of the connector on the cable according to

the procedures in 2.2.2 above. Lift the spring loaded cover on the Hub Shelf rear panel connector and push in

the SC/UPC cable connector until firmly seated (the connector may or may not “click” into place; do not push

too hard). You may want to use the cable clamps located on the four corners of the rear panel to manage and

protect the cables.

The front panel of each Plug-In has two 1.75” x 0.5” (4.4 cm x 1.3 cm) outlines labelled A and B which can

be used to affix standard “address” size labels (Avery 5167) to designate which Remote Transceiver is

connected to that path.

Do not connect the RF cables yet.

If more than one Hub Shelf is being used, connect the SERIAL DATA ports together using CAT-5 jumpers

with RJ-45 connectors. The two SERIAL DATA ports on the rear panel are coonected together; two are

provided to permit the use of simple jumpers when daisy-chaining several units.

Connect the LINE port to a POTS telephone jack for the dial-up modem connection.

If it is being used, connect the chassis to the local OA&M interface by way of the 37 pin D-Sub connector on

the rear panel of the Hub Shelf (see section 2.3: System Alarms).

Turn on the chassis power. Powering up the chassis will “light up” the fiber allowing those installing the

Remote Transceivers to identify the transmit and receive cables using an IR sensitive card (see

Recommended Tools) to see which fiber is emitting light. The fiber emitting light at the Remote Transceiver

end is the transmit path and is connected to the OPTICAL IN connector on the Remote Transceiver (after

proper cleaning; see section 2.2.2).

If the transmit RF signal from the BTS or repeater is to be routed to all the plug-ins in both sides of the Hub

Shelf, connect the external 1:2 RF splitter supplied with the Hub Shelf to both RF IN ports on the rear panel.

If the receive RF signals from all of the plug-ins in both halves of the Hub Shelf are to be routed to a single

receive port on the BTS or repeater, connect the other 2:1 RF combiner to both of the RF OUT ports on the

rear panel. If one of the RF OUT ports is to be connected to the BTS or repeater receive diversity port, do

not connect the RF combiner.

Connect the RF OUT to the BTS or repeater receive port(s).

Before connecting the RF transmit cables from the BTS or repeater to the RF IN of the Hub Shelf, verify that

the BTS or repeater RF output power levels are consistent with the desired output power at the Remote

Power Supply and will not overdrive or damage the OfficeCell Plug-Ins. Connect the BTS or repeater RF

transmit cables to the Hub Shelf.

2.7 Installing the Remote Transceivers

Each Remote Transceiver is mounted above the false ceiling against the wall with the connectors pointing

down for easy access. In an area with no false ceiling, it can be mounted in the room near the ceiling with the

connectors pointing up. This permits a more aesthetic routing of the cables in the wall-ceiling corner. The

REMOTE TRANSCEIVER is connected to the Hub Shelf with a singlemode fiberoptic cable with a

maximum optical loss of 4 dB, including connectors and patch panels.

! The minimum bend radius of the fiber is 2 inches (5 cm). Be careful not to kink the fiber.

2-10

To mount the Remote Transceiver, first install the mounting bracket. Two mounting brackets are available.

One is smaller and accomodates a single Remote Transceiver. The other, larger bracket accomodates one

Remote Transceiver and one Remote Power Supply. The bracket is attached to a wall or bulkhead using #6

pahhead or M3.5 screws. The Remote Transceiver (and Power Supply, if applicable) are mounted on the

bracket by inserting the rear panel studs into the keyhole slots in the bracket. Each Unit is secured to the

bracket by threading the captive thumscrew (located at the connector end of the unit) into the threaded hole in

the tab on the bracket. See the figures below for more detail.

The Remote Transceiver takes +15 to +24 VDC power through a field-installable Molex connector. If the

Remote Power Supply is being used, the DC connection is provided by simply plugging in the DC cable from

the REMOTE POWER SUPPLY to the REMOTE TRANSCEIVER. The REMOTE POWER SUPPLY should

be powered through a sheilded AC power cable installed according to local building codes.

For DC versions , the terminals can take wires 18 AWG to 14 AWG. The choice will depend on the voltage

used and the distance from the power supply (see Specification, Electrical).

Next, install the indoor coverage antenna according to the manufacturer’s instructions. Connect the antenna to

the Remote Transceiver RF SMA connector using a flexible RF cable with VSWR < 1.5 : 1 at the frequencies

in use.

! RF SMA connectors should be tightened with a torque wrench set to 8 in-lbs. Do not

overti

hten!

Figure 3. Mounting the Remote Transceiver: Mounting Bracket.

Any antenna connected to this device must result in an ERP < 1.5W(800 and 900MHz) or <

3.0W

(

800

and

900

z)!

2-11

Connect the optical cable. The fiber for the transmit (downlink) path connects to the OPTICAL IN connector.

The fiber for the receive (uplink) path connects to the OPTICAL OUT connector (Green with laser DANGER

label). The fibers should be labelled accordingly during installation of the fiberoptic cables. If not, they can

be identified by turning the Hub Shelf power on with the plug-ins and fiberoptic cables installed. Then, use

an IR sensitive card (see Recommended Tools) to detect the light emitted from the transmit fiber. Point the

optical connector on each fiber at the card to see which fiber is emitting light (you see a glowing spot on the

card). This is the fiber for the transmit path. The other is for the receive path.

Knowing the desired output power level from each Remote Transceiver as determined by the network design,

the Output RF Power can be preset before the system is powered up. Given the rated maximum power from

the Remote Transceiver, the antenna gain an the loss in the RF cable, the output RF power is maximum when

the Output Power adjustment is set at 0. The static output power can be reduced by turning the adjustment.

The adjustment is indented and each indent changes the output power by 2 dB.

Once all connections have been made, turn on the AC power (or DC power, depending on the option used) to

Hub Shelf and Remote Transceivers. Before connecting the transmit RF input from the source, check that the

level is that needed for optimum signal to noise and distortion as determined in the network design (see Table

1 above). Connect the RF cables to the Hub Shelf.

WARNING: Do not look directly into the end of the fiberoptic connector. Laser light

invisible

and

can

cause

eye

damage.

! To prevent damage to the Hub Shelf plug-ins, do not exceed the maximum ratings for RF input to

the

Shelf

3-1

3 Monitoring and Troubleshooting

3.1 Field Support Numbers

The tips given below should help pinpoint most link problems. Often, problems are a result of a poor optical

interface which is easily fixed by properly seating a connector or cleaning the connector. There are no user

serviceable parts in the OFFICECELL. Faulty units must be returned to Repeater Technologies Inc. for repair

or replacement. For technical support call 800-938-1901 in the U. S. or 408-747-1946.

3-2

3.2 Troubleshooting Tips

Alarms Probable Cause Action*

Node Function 1. Remote Transceiver Downlink Tx

amplifier chain failure

2. Pilot tone oscillator malfunction

3. Pilot tone detector malfunction

1. If Remote Transceiver Rcvd

Opt Pwr LED is OFF, this

indicates downlink amplifier

chain failure: replace Remote

Transceiver.

2. Repair/replace failed Plug-In

3. Repair/replace failed Plug-In

1. Node Function

2. Received Opt Pwr

Low (Remote

Transceiver)

1. Problem in downlink fiber path:

optical loss too high: fiber run is

too long, connector not seated

properly, damaged or in need of

cleaning, damaged splice

2. Remote Transceiver photodiode

failure

1. Check Rcvd Optical

Power LED at Remote

Transceiver. If active

(Yellow), disconnect

downlink fiber and check

optical output with light

sensitive card. If no light

detected, inspect fiber

path, esp. any connector

recently disconnected.

Inspect for proper

seating. Clean

connectors. If necessary,

disconnect fiber from

OFFICECELLand check

fiber path with OTDR to

locate problem.

2. If fiber is OK, indicates

Remote Transceiver

photodiode failure:

replace Remote

Transceiver.

1. Node Function

2. Received Opt Pwr

Low (Plug-In)

1. Remote Transceiver laser failure

2. Problem in uplink fiber path:

optical loss too high: fiber run is

too long, connector not seated

properly, damaged or in need of

cleaning, damaged splice

3. Plug-In photodiode failure

1. Check Laser Alarm in

Remote Transceiver. If

active (Red), replace

Remote Power Supply.

2. If not, inspect fiber path,

esp. any connector

recently disconnected.

Inspect for proper

seating. Clean

connectors. If necessary,

disconnect fiber from

OFFICECELLand check

fiber path with OTDR to

locate problem.

3. Replace Plug-In

3-3

1. Node Function

2. Received Opt Pwr

Low

3. Laser Pwr Low (both

Hub Shelf Plug-In and

Remote Transceiver)

Failing or failed Plug-In laser Replace Plug-In

Laser Pwr Low (Hub

Shelf Plug-In) Failing laser Replace unit Hub Shelf Plug-In

1. Laser Pwr Low (either

in Hub Shelf Plug-In or

Remote Transceiver)

2. Received Opt Pwr

Low (opposite end)

Failing laser Repair/replace unit (Hub Shelf

Plug-In or Remote Transceiver)

Received Opt Pwr Low

(Hub Shelf Plug-In) 1. Failed/failing laser in Remote

Transceiver

2. Optical loss too high, link may not

be operating within

specifications. Fiber path may be

too long. Problem in fiber path:

connector not seated properly,

damaged or in need of cleaning,

damaged splice

1. Inspect Remote

Transceiver for Laser

Alarm LED on (Red). If

so, replace Remote

Transceiver

2. Inspect fiber path, esp.

any connector recently

disconnected. Inspect for

proper seating. Clean

connectors. If necessary,

disconnect fiber from

system and check fiber

path with OTDR to

locate problem.

Hub Shelf: Main Power

Alarm Main Power Supply Failure (voltage

dropped more than 1 V from +15V) Replace Main Power Supply

Hub Shelf: Backup

Power Supply Alarm Backup Power Supply Failure (voltage

dropped more than 1 V from +15V) Replace Backup Power Supply

Battery Alarm 1. During battery only operation this

would be normal after unit has been on

for 10 to 20 minutes. Should go off

after main power is restored and

battery charges up.

2. If main and/or backup power supplies

are OK, this indicates battery or

recharging circuit failure

1. No Problem

2. Replace Chassis

* All repairs of OFFICECELL components must be performed by the factory

Repeater Technologies OC80002 Distributed Antenna Systems User Manual users manual

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