Andrew Wireless Innovations Group BCP-TFAM26 Model TFAM26 Downlink Booster User Manual

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Document Description	Users manual part 2 of 3
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Date Submitted	2004-06-25 00:00:00
Date Available	2004-06-25 00:00:00
Creation Date	2004-06-24 14:56:53
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2004-06-24 14:57:30
Document Title	User Manual
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Document Author:	tekmar sistemi

Fig. 8: TKA layout with quote for wall anchors
26
User Manual
TFAxxx behaviour at system start-up
Before the TFAxxx remote unit is switched on, make sure that:
• the modules hosted by the Master unit have been connected each other with the RF jumpers,
according to what has been planned in the system design
• every TFLN local unit has been connected to its remote units
• each remote unit has been connected to its coverage antennas
For a correct system start-up, all the remote units are to be switched on before the Master Unit.
For proper operations, the Master Unit can be turned on only when all the remote units are already on.
Once the TFAxxx has been switched on, its behaviour can be summarized in the following steps:
1. when the Remote Unit is turned on, both the LEDs upon the warm side turn on for a couple
of seconds
2. After that, the unit green LED remains on (thus indicating proper power supply), while the
red LED switches off as soon as the Master Unit is turned on (meaning that DL optical
power is OK and no alarms are present).
3. Once the Master Unit has been switched on, the status of both LEDs have to be as reported in
table 2. In case the red LED remains on, please refer to the troubleshooting section.
Led colour
Green
Red
Status and Meaning
ON
(when power supply is on)
OFF
(when no major failure affects TFAxxx operations)
Tab. 2: Status of TFAxxx LEDs in working conditions
4. After being switched on the remote unit starts working correctly. Anyway, in order to be
recognized by the maintenance and supervision software, it is necessary for the corresponding
TFLN local unit to carry out the discovery phase (please refer to Supervision System Manual
for more details). During this phase which can last at max. 4min, depending on the system
complexity, the TFLN LED ┌┘ blinks. Do not connect/disconnect any cable or any piece of
equipment during the discovery phase! This may result in failing the identification of the
remote unit.
TFAxxx troubleshooting
Faults can be revealed by LEDS on the TFAxxx front panel as well as by LMT or supervision system
(running on the agent)
Both LMT and supervision system provide full information about the device causing the alarm. As a
consequence, troubleshooting procedure can be very immediate when failure detection is directly
carried out through LMT or supervision system.
Britecell Plus modules are designed in order to exchange information so that each remote unit can
receive failure notifications from its external equipment (e.g. a TFBW booster) through dry-contact
connections. Moreover, the TFAxxx constantly monitors the optical signal received from its TFLN unit
to control optical losses.
The following table reports a brief description of alarms related to each remote unit, together with a
reference to the corresponding alerted LEDs on the triple band remote unit front. Single band and dual
band units have similar alarms, where applicable.
MN024-04
27
Alarm description
Failure on external equipment connected to dry-contact 1
Failure on external equipment connected to dry-contact 2
Internal power supply failure
Breakdown in communications inside the TFAxxx board
The optical power received on DL port is too low (ie, the AGC
can no more compensate the optical losses on DL input signal)
The optical power received on DL port is near to critical level,
but the system still works (ie, AGC still compensates losses)
GSM DL power amplifier failure
DCS DL power amplifier failure
UMTS DL power amplifier failure
Too high TFAxxx temperature
Red LED status Priority
On
High
On
High
On
High
On
High
On
High
No detection
Low
On
On
On
No detection1
High
High
High
Low
Tab. 3: Alarm Description
This temperature alarm can be revealed by supervision or maintenance software if the TFAxxx board overheats.
Keeping environmental conditions between +5°C and +40°.is an important key factor to get a proper TFAxxx
temperature.
As the table shows minor alarms (low priority alarms) are revealed only by LMT or supervision
system, but not by LEDs. Minor alarms detect critical situations which should be checked and tested in
order to avoid future possible system faults.
Each remote unit is provided with an AGC system which comes in after the optical-to-RF conversion.
This AGC can correctly compensate optical losses when these are estimated to be < 3 dB. In case
optical losses are in the 3dB- 4dB range, the whole system still works, but AGC is near to its borderline
levels. The red LED switches on when the estimated optical losses are > 4dB, the AGC not being able
to compensate these losses any more.
As shows in the previous table, the same red LED switches on to reveal any major failure. Following
the troubleshooting procedure reported hereinafter it is possible to better understand what the problem
is.
Main troubleshooting procedure
(The following procedure is summarized by the flow-chart in fig. 8)
In case the red LED is ON, please follow these steps:
1. first of all, refer to dry-contact troubleshooting, so as to understand whether the alarm can depend
on any external equipment failure (e.g. a TFBW booster failure) or not.
2. in case dry-contact troubleshooting has not revealed any failure, clean the optical adapter
3. if the problem still persists, refer to the fibre optic UL troubleshooting in order to check if optical
cables or optical connections have any problem on UL path.
4. if previous action didn’t make the LED switch off replace the unit with a new one or contact for
assistance.
28
User Manual
Is the red LED
ON upon the
TFAxxx?
start
No
Yes
Verify if any external
equipment or any dry contact
port have some problems.
Refer to dry-contact
troubleshooting (fig. 10)
No
Is red LED upon
TFAxxx still
ON?
Yes
Clean the SC-APC
optical adapters
and connectors
Is red LED upon
TFAxxx still
ON?
No
Yes
Optical cable or optical connections
are supposed to have problems on
UL path. Refer to fibre optic UL
troubleshooting (fig. 11)
end
Fig. 9: Flow-chart describing the main troubleshooting procedure on TFAxxx
Dry contact troubleshooting
(The following procedure is summarized by the flow-chart in fig. 10)
This procedure needs to be considered if at least one TFAxxx dry-contact is connected to some external
equipment. If not, return to main troubleshooting procedure.
Follow steps 1, 2 for each dry contact connected to any external equipment. These steps aim to detect
any failure inside the external equipment or inside the dry-contact port. If dry-contacts don’t reveal
equipment malfunction or a port failure, return to the main troubleshooting procedure.
For any dry-contact connected to some external equipment, follow these steps:
1. Disconnect it, and check the TFAxxx LED status after the disconnection.
2. If the red LED has switched off, external equipment connected to the dry contact port should be
faulty. Please test it.
3. If the TFAxxx red LED still remains on after the disconnection, measure voltage between the
terminals of the dry contact port.
a. If the terminals are electrically closed, the dry-contact port sis faulty. Contact the
manufacturer for assistance.
b. If the terminals are open, this means neither the analysis of the present dry contact nor the
one of its external equipment has revealed failures. Re-connect the present dry contact port
to its external equipment. In case the TFAxxx has another unchecked dry-contact
connected to some external equipment, apply the whole procedure (ie steps 1-3) to this
new port
MN024-04
29
Is any dry contact
connected to some
external equipment?
start
No
Yes
Disconnect the
dry contact port
Is red LED
upon TFAxxx
still ON?
External equipment
connected to this dry
contact port should be
faulty. Test it.
No
Yes
Measure voltage between
the terminals of this dry
contact port
Is this dry contact
electrically closed?
Yes
The dry contact port
is faulty. Contact
the manufacturer
for assistance.
No
Analysis about this dry
contact and its external
equipment has not revealed
any failures.
Re-connect dry contact port
to its external equipment.
Is the other dry
contact connected
to external
equipment?
No
Yes
end
Fig. 10: Flow-chart describing the dry-contact troubleshooting.
Fibre optic UL troubleshooting
(The following procedure is summarized by the flow-chart in fig. 11)
Check if there is any point where the fibre experiences a small radius of curvature. In this case,
rearrange the optical path in order to avoid sharp bends (if necessary, replace the optical cable with
a longer one). If this makes the TFLN red LED switch off, troubleshooting has been successful.
Otherwise, follow next steps.
Check if the SC-APC connectors are properly installed at both fibre ends (i.e. TFLN and TFAxxx
ports). In case they are not, fix better SC-SPC connectors to relevant adapters. If this makes the
TFLN red LED switch off, troubleshooting has been successful. Otherwise, follow next steps.
Disconnect the optical fibre and clean it at both fibre ends (i.e. TFLN side and TFAxxx side) then
reconnect the fibre to relevant ports. In case this makes the TFLN red LED switch off,
troubleshooting has been successful. Otherwise, follow next steps.
Disconnect the optical SC-APC connector from TFLN UL port, and measure the output power
Pout(UL) at corresponding fibre end (i.e. the power coming out of SC-APC UL connector). Then, go to
the TFAxxx side, disconnect the optical SC-APC connector from TFAxxx UL port and measure the
input power Pin(UL) coming out of the TFAxxx UL port (i.e. the optical power entering the fibre).
Calculate the UL fibre attenuation AUL as: AUL [dB] = P in(UL) – P out(UL)
If AUL > 4dB, the fibre optic cable has some problems or cable path is too long. Replace it.
If AUL < 4dB, then TFAxxx remote unit should be faulty. Before replacing it, check the
TFAxxx status on supervision system and contact for assistance.
30
User Manual
Is there any small
radius of curvature
of the fibre?
start
Rearrange the optical path in order to
avoid sharp bends. If necessary
replace the optical cable with a
longer one.
Yes
No
Yes
Are SC-APC
connectors properly
installed at both fibre
ends?
Is the red LED
upon TFLN still
ON?
No
Fix SC-APC connectors
properly to adapters
No
Yes
Yes
Yes
Disconnect the optical SC-APC
connector from TFLN UL port.
Measure the output power
at the corresponding fibre
end (i.e. coming out of this
SC-APC UL connector)
Calculate the UL fibre attenuation:
AUL[dB]=input power - output power
No
Yes
Go to the
TFAxxx
side
No
Re-connect the
fibre to relevant
ports.
Clean the optical SC-APC
ports both on TFLN and
TFAxxx side.
Disconnect the optical fibre
and clean it at both ends.
Is AUL > 4dB?
Is the red LED
upon TFLN still
ON?
Is the red LED
upon TFLN still
ON?
No
Disconnect the optical
SC-APC connector
from TFAxxx UL port.
Measure the input power entering
the fibre (i.e., coming out of the
TFAxxx UL port)
Fibre optic cable has some problems.
Replace it.
The TFAxxx remote unit should be faulty. Before
replacing it, verify its status through supervision
system and contact for assistance.
end
Fig. 11: Flow-chart describing the fibre optic UL troubleshooting
MN024-04
31
4. Master Unit
32
User Manual
4.1. 19” Subrack TPRNxy
MN024-04
33
Name:
TPRN
Major TPRN features
The TPRNxy is a 19”subrack where all the Britecell Plus plug-in
modules can be inserted. Britecell Plus equipment provides a wide
variety of these subrack models, differentiated by power supply and by
communication ports placing. Each one is provided with:
• 12 free slots, each with Height=4HE, Width=1HE
• Power supply 220 Vac or -48 Vdc
• Locally or remotely connectible through:
RS232 serial port
RS485 two-wire bus
sub-D 15 pin male-connector
• Internal microcontroller for I2CBUS alarm collection
• Manual reset button, able to re-initialize both the inserted modules
and the TPRN microcontroller
• Manual stand-by button, able to re-initialize the inserted modules,
while keeping the TPRN microcontroller working.
Front view of the TPRN sub-rack with
power supply and communication ports
on the back
sub D 15
connector
RS485
ports
Back view of the TPRN sub-rack with power supply
and communication ports on the back
buttons
RS232
port
Power supply (picture
shows 220Vac version)
Front view of the TPRN sub-rack with
power supply and/or communication
ports on the front through TFM board
TFM
board
allowing
communication ports and
power supply (according
to relevant versions) on
the front of the subrack.
34
User Manual
TPRN models
A brief description of all the available TPRN master units is reported hereinafter.
Passive subrack (TPRN04)
• TPRN04 is a passive subrack. It does not provide power supply to any inserted module, and
therefore it is designed to host passive modules only. It can be useful in a multi-subrack
system, in case the customer decides to put all the active modules in an active subrack, to be
chosen among the following ones.
220 Vac powered TPRNs (TPRN14 / TPRN24 / TPRN14F / TPRN24F)
•
TPRN14 is an active subrack designed to be fed through 220 Vac universal mains. Both the
connector for 220Vac power supply and the communication ports are placed on the subrack
rear. The 220 Vac power supply is not redundant (ie, no spare adapter is provided).
•
TPRN24 is an active subrack designed to be fed through 220 Vac universal mains. Both the
connector for 220Vac power and the communication ports are placed on the subrack rear, and
the 220 Vac power supply is redundant: i.e., a spare adapter guarantees the correct system
operations even in case the main 220Vac adapter has a breakdown.
•
TPRN14F is an active subrack designed to be fed through 220 Vac universal mains. The
connector for 220Vac power supply is on the subrack rear, while the communication ports are
on a TFM module, inserted in the 12th master unit slot. The 220 Vac power supply is not
redundant (i.e. no spare adapter is provided).
•
TPRN24F is an active subrack designed to be fed through 220 Vac universal mains. The
connector for 220Vac power supply is on the subrack rear, while the communication ports are
on a TFM module, inserted in the 12th master unit slot. The 220 Vac power supply is
redundant: i.e., a spare adapter guarantees the correct system operations even in case the main
220Vac adapter has a breakdown.
-48Vdc powered TPRNs (TPRN34 / TPRN34F)
•
TPRN34 is an active subrack designed to be fed through –48 Vdc negative supply. Both the
connector for -48Vdc power supply and the communication ports are placed on the subrack
rear.
•
TPRN34F is an active subrack designed to be fed through –48 Vdc negative supply. Both the
connector for –48 Vdc power supply and the communication ports are on a TFM module,
occupying the 12th master unit slot. This allows an easier maintenance, in case the -48 Vdc
power supply has a breakdown.
MN024-04
35
TPRN power supply
All the TPRN models refer to one of the following power supplies.
Universal mains
(85 ÷ 264Vac, 50/60Hz).
This connector is mounted on the TPRN back panel either
for the redundant version or the simple one. A ground
terminal and a couple of fuses are also included. Fuses
have to be replaced in case they fail (when it happens both
the green LED on TPRN panel and the supervision system
detect the failure).
Fuses
Ground terminal
Fig. 12: 85÷264Vac connector
-48 Vdc
(-72 ÷ -36 Vdc)
This connector can be mounted on TPRN back panel or on
TPRN front, depending on the TPRN model.
A fuse is present under the –48 Vdc connector, and has to
be replaced in case it fails (when it happens, both the green
LED on TPRN panel, and the supervision system detect the
failure).
black terminal: 0V
blue terminal:-72÷ -36Vdc
Fuse
Fig. 13: -72÷-36Vdc connector
Whatever power supply is chosen (85 ÷ 264 Vac or -72 ÷ 36 Vdc), an additional external ground terminal is
provided on the TPRN rear (see fig. 14).
Fig. 14: ground terminal on the rear
The external power supply (220Vac or -48Vdc) is converted into a +12Vdc voltage allowing
feeding the active modules inserted into the TPRN.
36
User Manual
TPRN ports
The TPRN subrack is provided with a set of I/0 ports which allow the connection to any external
device. All these ports (RS232, RS485, sub-D 15 pin male connector) can be placed both on TPRN
back and on TPRN front, depending on chosen version.
RS232 serial port
The RS232 serial port can be used to connect the TPRN subrack to the agent.
The connection baud rate can be set to 9600 bps or 19200 bps, by properly setting the dip-switch 5
standing on the interior TPRN backplane (see fig. 15). The baud-rate setting through dip-switch 5 is
shown in table 4.
Baud-rate dip-switch (5)
RS485-addressing dip-switches (1-4)
Fig. 15: Dip-switches on TPRN backplane.
Baud rate [bps]
9600
19200
Dip-switch 5
OFF
ON
Tab. 4: Setting RS232 baud-rate through dip-switch 5
Whichever baud rate you choose through dip-switch 5, remember that:
•
the same RS232 connection speed must be set up on the agent
•
the baud-rate which is selected through the dip-switch 5 sets the connection speed for both the
RS232 port and the RS485 port as the TPRN uses both ports with the same rate.
RS485 port
The RS485 port consists of two RJ-45 connectors, which work as input and output ports towards a
RS485 bus.
This RS485 bus has to be used in order to connect a multi-subrack system to the agent. In this case:
•
the TPRN subracks have to be connected one another via RS485 bus;
•
In order to monitor the whole system, the agent has to be connected to one of the TPRN
subracks through RS232 port.
MN024-04
37
Before connecting one another the TPRN subracks belonging to a multi-subrack system, remember
to assign an exclusive binary address to each one. This is essential in order to let the supervision
system recognize the different master units.
The binary address assignment can be done through dip-switches 1,2,3,4, which stand on interior
TPRN backplane (see figure 15). A list of the correspondences between the addresses and the dipswitches is provided by table 5: simply note that dip-switch 1 is the least significant binary digit,
while dip-switch 4 is the most significant one.
Address
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
Dip-switch 1
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Dip-switch 2
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
Dip-switch 3
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
Dip-switch 4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
Tab. 5: Dip-switches address settings
The baud rate of the RS485 ports is the same of the RS232 port as per the setting of dip-switch 5
(see before)
Whichever baud rate you choose, remember that:
•
the same RS485 connection speed has to be set up on all the connected device (TPRN
subracks or TSUN);
•
the baud-rate which is selected through the dip-switch 5 sets the connection speed for both
the RS485 port and the RS232 port.
Sub-D 15 pins male connector
The TPRN subrack provides a sub-D 15 pins male connector, shown in fig. 4.17.
PIN 1
PIN 9
PIN 8
PIN 15
Fig. 16: sub-D 15 pin male connector
38
User Manual
This connector provides:
•
4 optoisolated input ports which can be used to reveal any failure on remote equipment. The
default status of these input ports can be defined through the supervision system. After that,
any change from default status will be revealed as a failure signal and cause the
corresponding Auxiliary Input LED to switch on upon the TFM board (on TPRN front
panel)
•
a summary of major and minor alarms related to failures detected not only on the TPRN
subrack, but also on any active module hosted by the TPRN itself.
•
2 relay output ports, which be can used to drive any external device connected to subD-15
pins adapter. By using the supervision system each of these output ports can set up on
“open” or “close” conditions.
A more detailed description of the meaning and functionality of each pin is reported in table 6. The
pins are numbered from left to right, and from top to bottom (refer to fig. 16).
PIN
Name
Meaning
Ground
It is a ground terminal for digital inputs, i.e. for pin 2, 3, 9, 10.
Digital input n°1
(SW assignable)
5,6
7,8
10
11
This port can be used to monitor external equipment status. Once a
default working status has been assigned (through supervision system) to
this input port, any change is detected as a failure signal causes the
Auxiliary Input LED 1 to switch on upon the TFM board.
This port can be used to monitor external equipment status. Once a
Digital input n°2 default working status has been assigned (through supervision system) to
(SW assignable) this input port, any change is detected as a failure signal causes the
Auxiliary Input LED 2 to switch on upon the TFM board.
Disconnected pin No meaning
Summary of
These pins present an open circuit if a major alarm is active on the
major alarms
TPRN subrack or on any module hosted by it.
Summary of
These pins present an open circuit if a minor alarm is active on the
minor alarms
TPRN subrack or on any module hosted by it.
This port can be used to monitor external equipment status. Once a
Digital input n°3 default working status has been assigned (through supervision system) to
(SW assignable) this input port, any change is detected as a failure signal causes the
Auxiliary Input LED 3 to switch on upon the TFM board
This port can be used to monitor external equipment status. Once a
Digital input n°4 default working status has been assigned (through supervision system) to
(SW assignable) this input port, any change is detected as a failure signal causes the
Auxiliary Input LED 4 to switch on upon the TFM board
Disconnected pin No meaning
These pins are terminals of an output port (output relay 1), which can be
Digital output n°1 driven through the supervision system. The output port can be set to
12,13
(SW assignable) “open” or “close” condition. These 2 statuses can be used to pilot any
external device connected to subD-15 connector.
These pins are terminals of an output port (output relay 2), which can be
Digital output n°2 driven through the supervision system. The output port can be set to
14,15
(SW assignable) “open” or “close” condition. These 2 statuses can be used to pilot any
external device connected to subD-15 connector.
Tab. 6: Functional description of pins provided by sub D male connector.
Note: The TPRN subrack uses I2Cbus standard protocol to collect status and alarm information from
hosted modules. Thanks to that, the alarm summaries (provided through pins 5-6 and 7-8) report
major and minor failures related not only to TPRN subrack but also to any hosted module.
MN024-04
39
TPRN visual alarms (where available)
A full description of all TPRN alarms is provided by the Supervision system. All TPRN subracks
including a TFM board (i.e. TPRN14F, TPRN24F, TPRN34F models) also provide alarm
monitoring through the LED front panel (see fig. 17).
MAJOR
ALARM
MINOR
ALARM
ON
STANDBY
AUX
IN
Label
LED colour Meaning
MAJOR
ALARM
MINOR
ALARM
ON
STANDY
Red
Yellow
ON when a major alarm is detected on
TPRN
ON when a minor alarm is detected on
TPRN
Green
ON when TPRN is on
Red
Red
Red
Red
ON if any external alarm is detected through
the input port 1 of sub D connector.
ON if any external alarm is detected through
the input port 2 of sub D connector.
ON if any external alarm is detected through
the input port 3 of sub D connector.
ON if any external alarm is detected through
the input port 4 of sub D connector.
Fig. 17: LED panel on TFM board
Tab. 7: alarm description
Major and minor LED alarms upon TFM board refer only to major and minor failures on the TPRN
itself and do not detect any fault on the hosted modules.
Note: Being able to collect module status through I2Cbusl, the TPRN also knows any alarm
information about the hosted modules. However, as each active module controls its internal failures
through its own LEDs panel, the LEDs upon TPRN subrack only refer o its circuitry.
Auxiliary input LEDs reveal an alert condition when corresponding pins recognize any alarm on the
external device connected through sub D 15 connector.
Warning (recommended for system designing and installing)
Providing a correct heat dissipation
For a correct use of the TPRN subrack, it is important to verify that:
40
•
the system is designed in order to put no more than 8 active modules inside a TPRN
subrack. This guarantees a proper heating dissipation for the system. In case you want to
install more than 8 active modules inside a TPRN subrack, it is important to provide the
subrack with a proper ventilation system;
•
active and passive modules should be alternated as much as possible inside the TPRN
subrack avoiding too many active cards being inserted close together;
•
in case the system consists of more than one TPRN subrack, a minimum distance of 1 HE
has to be kept between nearby TPRN subracks to ensure proper heat dissipation. The rack
containing the TPRN subracks has to be large enough to guarantee this correct distance
between master units.
User Manual
Minimizing equipment costs
In order to reduce the cost of Britecell Plus equipment, a multi-subrack system should be designed
according to the following guidelines:
•
a passive subrack (TPRN04) may be used to house only passive modules;
•
an active subrack (TPRN14, TPRN14F, TPRN24, TPRN 24F, TPRN34) may be used to
sustain all the active modules, and some of the passive ones (as stated above, it is advisable
to alternate active and passive cards into an active subrack).
Setting the dip-switches in a multi-subrack system
If you are installing a multi-subrack system, remember to assign each subrack an exclusive binary
address, by properly setting dip-switches 1,2,3,4 on the interior TPRN backplane (see fig. 15 and
tab.5). Dip-switch 5 has to be set on each TPRN subrack in order to fix the baud rate for RS485 and
RS232 port. Connecting TPRNs through RS485 port is necessary when supervising the whole
multi-subrack system through the SNMP agent which has also to be set at the same baud rate.
TPRN Installation
The TPRN kit provides:
•
1 Sub rack TPRN
•
1 suitable power cable
•
1 Britecell Plus User Manual
First of all insert the subrack into the cabinet and apply 4
screws (not provided) in order to fix it.
To have a correct TPRN installation, distance between the
front door of the rack and the front side of the TPRN should be
at least 15cm otherwise RF and optical cables can be damaged
when cabinet door is closed.
Leave at least 1HE distance between two subracks in
order to facilitate the air circulation.
Leave at least a 1HE free space between the bottom or
the top of the cabinet and the TPRNs.
MN024-04
Screw
1HE
41
Connect the ground to the safety ground terminal.
Then, connect the power supply connector to the mains.
Power
supply
Ground
terminal
TPRN behaviour at system Start-up
Before switching on the TPRN subrack, make sure that:
•
all expected modules have been inserted
•
the modules have been connected each other by RF jumpers, according to what has been
planned during system design
•
every TFLN contained in the Master Unit has been connected to its TFAxxx remote units
•
each TFAxxx remote unit has been connected to its coverage antennas
•
the agent (if present) has been connected/housed to/into the Master Unit
•
different subracks have been connected each other via bus RS485 and each of them should
have different addresses
•
the rack housing the TPRN is large enough to leave a minimum distance of 1HE between
contiguous TPRN subracks
Remember that TFAxxx remote units have to be switched on before relevant Master Unit. Only
when all the TFAxxx remote units are on, the Master Unit can be turned on.
Once the TPRN subrack has been switched on, the system behaviour can be summarized as per the
following steps:
1. when TPRN subrack is turned on, all seven LEDs upon the TPRN front panel (provided
that TPRN is equipped with a TFM board) go on for a couple of seconds
2. After that, the green LED remains ON (indicating proper power supply), while the other
LEDs indicate the remote units status, according to the following table 8
Note: Some of the AUX IN LEDs 1, 2, 3, 4 can remain ON if the corresponding input statuses are
wrongly associated to external equipment working condition. In this case, once the step 4 has
finished, remember to properly set the default status by the supervision system.
3. About 10sec after the TPRN subrack has been switched on, all TFLN modules housed in
the TPRN itself begin a “discovery” phase in order to identify and collect status of the
connected TFAxxx remote units. While the discovery phase is working (at max. 4min.
depending on the system complexity) each TFLN general alarm (i.e., LED “┌┘”) blinks,
whereas the other TFLN LEDs go on showing the detected status.
Do not connect/disconnect any cable or piece of equipment until all the TFLN modules
have finished the discovery phase. This may result in failing the identification of
TFAxxx. Anyway during the discovery phase, the whole system can still work correctly
as discovery process aims to collect information about TFAxxx but doesn’t affect the
basic working of the system.
42
User Manual
Label
LED colour
ON
Green
STANDY
MAJOR
Red
ALARM
MINOR
Yellow
ALARM
Red
Red
Red
Red
Status
ON
(when power supply is on)
OFF
(if no major alarm is detected on TPRN subrack)
OFF
(if no minor alarm is detected on TPRN subrack)
OFF
(if no external alarm is detected through the input port 1 of
the sub D 15 pin connector)
OFF
(if no external alarm is detected through the input port 2 of
the sub D 15 pin connector.
OFF
(if no external alarm is detected through the input port 3
of the sub D 15 pin connector)
OFF
(if no external alarm is detected through the input port 4
of the sub D 15 pin connector)
Tab. 8: subrack LED status in full-working condition.
4.
Once the discovery has finished, the general alarm (i.e. the LED “┌┘”) on each TFLN
panel stops blinking, and switches OFF (provided that the TFLN local unit is not affected
by a general failure).
TPRN troubleshooting
In case a TPRN subrack shows any problem, this will be revealed through LEDs upon TPRN front
panel. A more detailed status and alarm description could be provided through the SNMP agent.
It should be noted that TPRN minor and major alarm LEDs just refer to TPRN subrack itself and
detect errors on TPRN circuitry, but do not signal alert situations on the hosted active modules
Active modules are monitored by their own LED panels.
A complete overview of TPRN alarms is reported in the following table.
Alarm description
LED
LED colour
Redundant power supply active
Minor alarm LED
Major alarm LED
Minor alarm LED
Minor alarm LED
AUX IN LED 1
AUX IN LED 2
AUX IN LED 3
AUX IN LED 4
Yellow
Red
Yellow
Yellow
Red
Red
Red
Red
+12V degradation
I2Cbus error
Temperature out of range
Alarm revealed on auxiliary input port 1
Alarm revealed on auxiliary input port 2
Alarm revealed on auxiliary input port 3
Alarm revealed on auxiliary input port 4
Tab. 9: Brief description of alarms detected through TPRN LED panels.
Red major alarm LED refers to power supply degradation and switches on in case the +12Vdc
power falls below a threshold level in factory set. In this case, TPRN automatically turns to
standby mode so that alarm LED remains on while no over-current gets through the circuitry of
hosted modules, thus preserving the system integrity. Once power supply has been repaired, the
MN024-04
43
TPRN needs to be rebooted. In case the TPRN subrack is equipped with a redundant power supply
(TPRN24, TPRN24F), a degradation of the +12 Vdc power results in an automatic switching from
main to spare converter and yellow minor alarm LED switches on to highlight that the redundant
power supply is active. In case also redundant power supply degrade the TPRN automatically
turns to stand-by mode and major alarm red LED switches on to signal no-working situation. Once
the power supply has been repaired the TPRN needs to be rebooted.
I2Cbus alarm is a minor alarm which turns on when TPRN subrack cannot communicate with one
or more hosted module. Each TPRN slot is provided with 2 pins, which automatically detect the
presence of a module inside the slot. If the module is detected but TPRN is not able to
communicate with it through I2Cbus the minor alarm LED switches on.
Note: at commissioning remember to mask the unused slots through LMT software (please refer to
the relevant manual for more information) to avoid not significant alarm being switched on.
In case one of TPRN LED alarms switches on please refer to the troubleshooting procedure
reported hereinafter to recognize the failure. This procedure is valid in case the TPRN includes the
TFM module showing LEDs on the front panel otherwise please check LMT or supervision
system handbooks.
TPRN main troubleshooting procedure
(The following troubleshooting procedure is summarized by the flow-chart in fig. 18)
•
When the TPRN is correctly supplied, the green LED on TFM board is switched on. In case
the TPRN does not switch on, check the fuse upon the power supply connector. If it is burned,
just replace it with a new one, and restart the TPRN. If it is not, the power supply system may
be faulty, contact the manufacturer for assistance.
•
In case the major alarm LED (red LED) is on, the system experiences power supply
degradation. In this case, the TPRN automatically has turned to stand-by mode, in order to
preserve the internal circuitry from over-current. Contact the manufacturer for assistance.
•
In case the minor alarm LED (yellow LED) is on, please refer to Minor Alarm
Troubleshooting reported in the following.
•
In case any AUX IN LED (red LED) is on, an alarm condition is revealed through the
corresponding input port of sub D 15 pin connector, if any external device has been connected
to the TPRN master unit through sub D port, it may have some problems. Test it. If you do not
detect any failure on external device, the input port of subD-15 connector shouldn’t have been
set to the correct default status through the supervision system.
Minor alarm troubleshooting
(The following troubleshooting procedure is summarized by the flow-chart in fig. 19)
•
In case the TPRN is provided with a redundant power supply, the main power supply may
have failed. Check the fuse, and replace it if burned.
•
If the minor alarm LED is still on, disconnect one module at a time from the TPRN backplane.
After having disconnected each module, check if the minor alarm LED is still one.
44
In case the yellow LED switches off after disconnecting any card, the disconnected
module may be faulty. Test it or contact the manufacturer for assistance.
If the minor alarm LED remains still on, the TPRN may have problems either in internal
I2Cbus communications or in overheating. Contact manufacturer for assistance.
User Manual
start
Is green LED
ON?
No
Check the fuse status on power
supply connector. In case it is
faulty replace it with a new one.
Yes
Is green LED
still OFF?
No
Yes
Please contact the
manufacturer for assistance.
Is MAJOR
ALARM red LED
ON?
Yes
The system experiences power
supply degradation.
Power supply should be faulty,
please contact the
manufacturer for assistance.
No
Is MINOR
ALARM yellow
LED ON?
Yes
Refer to Minor Alarm
Troubleshooting
(fig.19).
No
Is any AUX IN
red LED ON?
No
Yes
Is any external
No
equipment connected
to subD port?
Please contact the
manufacturer for assistance.
Yes
The external equipment may be faulty. Test it. If no problem
is detected the input ports of subD connector are to be set to
the correct default status through supervision system.
end
Fig. 18: Flow-chart for TPRN main troubleshooting procedure
MN024-04
45
start
In case TPRN redundant power supply
is provided the main power supply
Yesif a fuse is
could have failed. Check
burned and replace it with a new one.
Is MINOR
ALARM yellow
LED still ON?
Yes
Disconnect one module at a time
from TPRN backplane and check if
MINOR ALARM LED is still ON.
No
Yes
Are there other
modules connected
to the TPRN
backplane?
Is the MINOR Yes
ALARM LED still
on?
No
The disconnected module
may have some problem.
Test it or contact
manufacturer for assistance.
No
I2Cbus backplane may
have some problems or
temperature may be
out of range. Contact
the manufacturer for
assistance.
end
Fig. 19: Flow-chart for Minor alarm troubleshooting
46
User Manual
4.2. Local Unit TFLN
MN024-04
47
Module name:
TFLN
Main processes carried out by the TFLN module
In Downlink (DL) operations:
• RF-to-optical conversion of the input RF signal
• Optical splitting: input RF signal is split onto 4 optical outputs
In Uplink (UL) operations:
• Optical-to-RF conversion of the 4 input optical signals
• Automatic Gain Control (AGC) of each converted signal to
compensate optical losses (provided they are < 4dB);
• RF combining of the 4 adjusted signals into a single RF output
RF ports
1 DL RF input port
1 auxiliary DL RF
input port, dedicated to
WLAN services
1 UL RF output port
1 auxiliary UL RF
output port, dedicated
to WLAN services
Note: nominal input levels
at RF port require a
maximum input RF power.
of 3dBm (please refer to
datasheet
for
further
information), as well as RF
outputs may require a
power adjustment to fill
within the BTS receiving
range.
In order to fulfil these
requirements, external UL
and DL attenuations may
be required (see TBSI
module).
Optical ports
UL RF Auxiliary
Output (SMB-m)
Status and
Alarm LED
DL RF Auxiliary
Input (SMB-m)
UL Optical Fibre
Adapters (SC-APC)
UL RF Main
Output (SMA-f)
DL RF Main
Input (SMA-f)
DL Optical Fibre
Adapters (SC-APC)
4 DL optical output
ports (SC/APC)
4 UL optical input ports
(SC/APC)
48
User Manual
TFLN visual alarms
The TFLN front panel is
provided with 6 LEDs (see
on the right), showing status
and alarm information.
LED meaning is reported on
the rightward table.
Further information about
alarm status is delivered by
Britecell Plus supervision
system.
Note: In case the four TFLN
optical output ports are not
all connected to Remote
Units, the unused ports must
be properly masked at
commissioning in order to
avoid
spurious
alarms
(please refer to LMT
manual).
Label LED colour
Meaning
Green
Power supply status OK
┌┘
Red
Red
Red
Red
Red
General TFLN failure, it can be:
- TFLN laser failure
- UL or DL amplifier failure
- TFLN short circuit
Low UL optical power received
from Remote Unit 1 (fault in
optical link 1 or Remote Unit 1
failure)
Low UL optical power received
from Remote Unit 2 (fault in
optical link 2 or Remote Unit 2
failure)
Low UL optical power received
from Remote Unit 3 (fault in
optical link 3 or Remote Unit 3
failure)
Low UL optical power received
from Remote Unit 4 (fault in
optical link 4 or Remote Unit 4
failure)
Tab. 10: summary of TFLN LED meanings.
TFLN power supply
Each TFLN local unit is supplied by the subrack back-plane (12V).
The power consumption of each TFLN local unit is 9W.
Warnings (to be read before the TFLN installation)
Dealing with optical output ports
• The TFLN local unit contains semiconductor lasers. Invisible laser beams may be emitted from
the optical output ports. Do not look towards the optical ports while equipment is switched on.
Handling optical connections
• When inserting an optical connector, take care to handle it so smoothly that the optical fibre is not
damaged. Optical fibres have to be single-mode (SM) 9.5/125µm.
• Typically, Britecell Plus equipment is provided with SC-APC optical connectors. As an
alternative, FC-APC connectors may be provided. Inserting any other connectors will result in
severe damages.
• Do not force or stretch the fibre pigtail with radius of curvature less than 5 cm. See fig. 20 for
optimal fibre cabling.
• Remove adapter caps only just before making connections. Do not leave SC-APC adapters open,
as they attract dust. Unused SC-APC adapters must always be covered with their caps.
• Do not touch the adapter tip. Clean it with a proper tissue before inserting each connector into the
sleeve. In case adapter tips need to be better cleaned, use pure ethyl alcohol
MN024-04
49
WRONG
OPTIMAL
Fig. 20: Fibre Optic bending
Inserting or removing TFLN modules
• Do not remove or insert any TFLN module into TPRN subrack before having switched off main
power supply.
• The TFLN modules must be handled with care, in order to avoid damage to electrostatic sensitive
devices.
• When installing TFLN modules in the subrack, take care to alternate active and passive cards in
order to ensure proper heat dissipation.
• In a multi-subrack system, remember to assign to each subrack a proper RS485 bus address
before installing the modules (please refer to TPRN section for further details).
TFLN positioning in system design
• In case no ventilation system is installed, do not insert more than 8 active modules into a subrack.
• In case more than 8 active cards have to be housed into the TPRN subrack, it’s advisable to install
the TPRN subrack inside a rack with forced ventilation.
• Take care to meet expected requirements on RF ports. An adjustable attenuator could be
necessary when the power coming from the BTS exceeds the required levels to avoid causing
damages in Britecell Plus circuitry or increase of spurious emissions.
TFLN installation
The TFLN local unit is housed in a TPRN subrack and its dimensions are 19” width and 4HE height.
A TFLN module can be accommodated in any of these 12 slots.
Note: In case a new TFLN module has to be
installed in a still working Master Unit, switch off
the subrack before inserting the plug-in TFLN
module
Firstly, gently insert the TFLN in one of the 12
available slots, and lock the 4 screws on the front
corners.
50
User Manual

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