UTStarcom Korea Technologies UTS-800FSU Wireless Local Loop Fixed Subscriber Unit User Manual Fixed Subscriber Unit

UTStarcom Korea Technologies Ltd. Wireless Local Loop Fixed Subscriber Unit Fixed Subscriber Unit

FSU Manual

Introduction to This Manual Fixed Subscriber Unit Installation Manual Release 1.00 10/03/97 Airstar-Wireless Local Loop 1-1 1. Introduction to This Manual This manual contains all the information necessary to install and maintain the Fixed Subscriber Unit (FSU). 1.1 Organization This manual is organized to assist the installer and technician in gaining an understanding of the Fixed Subscriber Unit in terms of the system’s physical characteristics, installation instructions, and maintenance methods. Listed below are descriptions of each chapter in this manual : Introduction - Describes the contents of this manual. General Description - Provides a high level description of the Fixed Subscriber Unit System. System Construction - Provides a more detailed system description of physical characteristics. Installation Instructions - Details all the steps necessary to install the device. Acronyms and Abbreviations List - Provides definitions for each abbreviation and acronym used in this manual. Appendix A : Specifications - Lists the specifications for the FSU.
1-2 Introduction to This Manual Fixed Subscriber Unit Installation Manual 10/03/97 Release 1.00 Airstar-Wireless Local Loop
Fixed Subscriber Unit Installation Manual General Description Release 1.00 10/03/97 Airstar-Wireless Local Loop 2-3 2. General Description The Fixed Subscriber Unit (FSU) is the radio equipment that connects to fixed standard telephones and is located in the subscriber’s residence. FSUs consist of a Radio Frequency (RF) interface and a telephone line interface. Together they manage the supplied line voltage, the ringing signal, Dial Tone (DT) and Busy Tone (BT) to the telephone, detect off-hook and on-hook states, and dialing. In a zone near the Radio Port (RP), the FSU uses a 4.5 dBi, omni-directional, attached antenna. In zones far from the RP, the FSU uses a 10 dBi, directional, Yagi type, attached antenna. In mid-range zones, the FSU uses a 7 dBi omni-directional antenna. The telephone line interface consists of a BRSH (Battery supply, Ringing Supervision, Hybrid) circuit, service tone generator, DTMF receiver, and ADPCM CODEC. The number of fixed standard connected telephones from the same battery supply circuit is three. The power of FSU is fed from the external DC power generated by AC adapter. Figure 2-1 shows the FSU in the Airstar-WLL system architecture. PhoneFAXComputerModemFixedSsubscriberUnitPhoneFAXComputerModemIndoor RPOutdoor RPRadio Port Controller Up to 32Copper Pair Up to 5KmCopper Pair Up to 5Km…..…..…..Personal StationAir InterfaceRCR STD-28Main Distribution FrameCentralOffice Terminal4 E1s…..…..…..Personal StationFixedSsubscriberUnit Figure 2-1 : Overview of FSU in Airstar-WLL System The following sections describe the air interface call handling procedures for outgoing and incoming calls. In addition, brief descriptions of the
General Description Fixed Subscriber Unit Installation Manual 10/03/97 Release 1.00 Airstar-Wireless Local Loop 2-4 authentication, hooking signal transmission, and meter pulsing signal transmission functions are provided. 2.1 Outgoing calls The call handling procedure for an outgoing call is depicted in Figure 2-2 and is described following the figure. A terminal on an FSU sends dialing information with standard in-band DTMF tones after recognizing dial tone. FSU1CO COT RPCRPRP34532SwitchMDF MDF Figure 2-2 : Outgoing Call 1. When the fixed standard telephone connected to the FSU goes off-hook, the FSU detects the off-hook state, seizes the radio link to the RP, and generates a signal to the standard telephone. If all radio channels are occupied, a Busy Tone is heard. Otherwise the FSU stores the dial code from the standard telephone, converts the outgoing message with the telephone’s number of Personal Handyphone System (PHS) protocol, and transmits the message to the RP. 2. The RP receives the message from that FSU through the radio link.
Fixed Subscriber Unit Installation Manual General Description Release 1.00 10/03/97 Airstar-Wireless Local Loop 2-5 3. The RP resends the received message to the Radio Port Controller (RPC) through the twisted pair wires via the Main Distribution Frame (MDF). 4. The RPC converts the PHS protocol message to a Q.931 protocol message. In addition, the RPC extracts the dial code from the outgoing message, and changes it to DTMF signals. The Q.931 message is sent to the COT through the D-channel of the E1 line. 5. When the COT receives the outgoing message, it converts that message, selects and seizes the corresponding analog line interface to the CO, and returns the seized message to the RPC. The RPC sends the DTMF dialing signals to the CO Switch through the voice path via the MDF. After dialing, the RPC and RP connect all voice paths between the CO Switch and the FSU connected to the outgoing standard telephone. The destination telephone rings and is picked up, and the outgoing call is put through. A voice path is now established between the 2 telephones. 2.2 Incoming Call The call handling procedure for an incoming call is depicted in Figure 2-3 and is described following the figure. FSU5CO COT RPCRPRP32134SwitchMDF MDF Figure 2-3 : Incoming Calls
General Description Fixed Subscriber Unit Installation Manual 10/03/97 Release 1.00 Airstar-Wireless Local Loop 2-6 1. A specific analog line is rung in the CO. The signal is sent to the COT via the MDF. 2. The COT detects the ringing of the line and sends the incoming message with the Q.931 calling number to the RPC. 3. When the RPC receives the incoming message from the COT, the RPC converts that Q.931 message to the PHS incoming message protocol and sends it through the MDF to all of the RPs. 4. The RPs page all FSUs and PSs. When the corresponding FSU number receives the paging message from the RP, it rings the connected telephone. 5. If the ringing telephone is lifted off-hook, an off-hook message is sent to the CO switch through the RP, RPC and COT. Speech paths are established between the connected telephones. NOTE : If a call is received while dialing out, the incoming call has priority. In the case of overlap sending, only DTMF dialing is availaable and DP is not supported. 2.3 Authentication Authentication is a function that prevents the unauthorized use of a subscriber’s telephone number. The authentication procedure is performed during Outgoing Calls, Incoming Calls and Location Registration. At subscription time each FSU is configured with a unique authentication key and telephone number. The COT is also configured with the telephone numbers and authentication keys for all FSUs within its management database. After receiving an authentication key code from the COT, the RPC: 1. Generates a random authentication pattern and sends it to the FSU. 2. Receives the calculation result from the FSU. 3. Checks the result and sends both the calculation and check result to the COT.
Fixed Subscriber Unit Installation Manual General Description Release 1.00 10/03/97 Airstar-Wireless Local Loop 2-7 COT RPC FSUFacility(Authentication Required (Key)) Authentication ReqAuthentication ReqFacility(Authentication Result) Authenticationoperation(calculationand check) Figure 2-4 : Authentication 2.4 Hooking Signal Transmission The hooking signal transmission function relays the hooking signal message from an FSU to a COT. The COT generates a hooking signal according to the message.
System Construction Fixed Subscriber Unit Installation Manual 10/03/97 Release 1.00 Airstar-Wireless Local Loop 2-8
System Construction Fixed Subscriber Unit Installation Manual Release 1.00 10/03/97 Airstar-Wireless Local Loop 3-9 3. System Construction The Fixed Subscriber Unit, as shown in Figure 3-1, has the following dimensions: • Length : 130mm • Width : 175mm • Depth : 40mm UTStarcomMONITORPOWER Figure 3-1 : FSU - Main Unit Refer to Appendix A for FSU specifications.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 3-10
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-11 4. Installation Instructions This section provides instructions for installing an FSU. The flow-chart in Figure 4-1 defines the steps involved in an installation. BeginEndInstall Main UnitAdjust AntennaChoose Antenna LocationChoose MainUnit LocationGather Accessoriesand ToolsInstall Coaxial CablePreparationInstall AntennaConfigureFSU Figure 4-1 : FSU Installation Flow Chart 4.1 Before Beginning To ensure that the FSU installation goes smoothly, it is necessary to do adequate planning prior to the installation. Things to consider: • Configuration of FSU • Configuration of COT • Placement of the Main Unit and the Antenna • Accessories, Standard and Special Tools required • Number of people needed to complete an installation. An FSU installation is accomplished in two parts : the Main Unit that is installed indoors and the Antenna that is installed outdoors.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-12 4.1.1 Plan FSU Configuration The FSU must be configured at subscription time with the subscriber’s telephone number, authentication key, operator ID, and carrier channel. The subscriber’s data must also be entered into the COT. The following data must be entered for each subscriber: • Telephone number • Authentication key • FXO port RP numbers of the RPs having the control channel for each FSU must also be entered in the COT. The RP numbers are determined either by the Coverage Map or by the installer at the subscriber’s site. Once the FSU main unit and antenna are installed, the installer uses the PHS Field Analyzer or equivalent to determine which RP’s signal is received by the FSU. This is accomplished by measuring the Received Signal Strength (RSS). Some FSUs will receive signals from multiple RPs, the installer must identify them and measure their RSS. Once RP number(s) are configured in the COT for the FSU, these RPs become the only RP(s) through which the FSU can place and receive calls. Refer to Section 4.2 for additional information regarding FSU configuration instructions. Use local procedures to ensure that the COT’s System Administrator gets the RP numbers and the associated telephone numbers for entry into the COT. Until an FSU’s RP numbers are configured in the COT, it will use any available RP for placing and receiving calls. 4.1.2 Antenna Orientation Careful placement of the antenna is necessary to ensure clear reception. Position the antenna so that it is : • In clear view of a Radio Port • Not blocked by buildings, summer foliage nor heavy traffic of large vehicles • At least 2 meters in height, use Coverage Map and on-site measurements to determine exact height, usually 2 meters or higher • Directed towards the strongest RSS measurement, for directional antenna only
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-13 • On a wall or pole that is sufficiently strong, make sure wall or pole can withstand winds common to the area • Away from other objects such as poles, trees, buildings, and so on that block the signal from the Radio Port; in general the minimum distance is 750 mm. 4.1.3 Antenna Type Determination Guidelines The Coverage Map shows Radio Port locations and the area covered by the RP. The type of antenna installed depends on its distance from the Radio Port. In general: If distance is… Then use… Less than 500m 4.5 dBi omni or directional antenna Between 400m and 700m 7 dBi omni or directional antenna Greater than 700m 10 dBi directional antenna Table 4-1 : Antenna Type Determination Guidelines There may be exceptions to the requirements in Table 4-1 identified by on-site RSS measurements and/or by the specific radio environment. 4.1.4 Main Unit Site Selection Choose a suitable location for the FSU Main Unit. Make sure the site will not expose the device to : • Direct sunlight • Dampness or moisture • Dust • Magnetic fields • Vibration • Extremes of heat, cold or humidity. Install the FSU on a stable surface, such as a desk or wall. Consider the length of the AC Adapter cord in determining the Main Unit’s location. To avoid possible interference from the connected telephone, make sure the Main Unit is installed at least 1 meter away. To minimize the length of coaxial cable
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-14 between the main unit and the antenna, position the indoor main unit as close as possible to the outdoor antenna. Note : Make sure that the FSU Main Unit is positioned so that the green LEDs are visible to the subscriber. When reporting trouble, the subscriber will be asked the status of the LEDs. 4.1.5 Installation Accessories, Standard and Special Tools This section lists all the equipment needed for and FSU installation. Be sure to have all of these items on hand before beginning. Accessories: • Coaxial cable • Coaxial cable connector (2 pieces) • Marker • PVC tape • Self-adhesive rubber tape • Earth cable • Solderless grounding terminal (optional) • Bracket for cable • U-bolt for pole mount • Terminal lug • Terminal lug crimper Note : In areas where lightning may strike, a lightning protector is required. Standard Installation Tools: • Wire cutter • Adjustable wrench • Pliers • Cutter • Flat screwdriver
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-15 • Phillips (or Plus) screwdriver • Electric drill • Step ladder • AC power extension cord Special Tools for Cable Termination: • Cable stripper • Crimper Antenna Orientation Instruments: • Map • Compass • Binoculars Measuring Receiver or Equivalent: • Measuring receiver • Memory card • AC adapter • Adapter (3-poles→2-poles conversion) • Coaxial cable adapter TNC-J/SM-J (optional) • 5 meters of coaxial cable (optional) • Power cable 4.2 FSU Configuration Instructions The FSU’s configuration data consists of dozens of parameters that are loaded at the factory. When a subscriber requests service, four of these parameters must be re-configured. Re-configuring the FSU entails writing the following information to the FSU’s Electrically Erasable Programmable Read Only Memory (E2PROM): • PS-ID • Telephone number [PS Number (1-11)]
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-16 • Authentication key • Operator ID • Control carrier The above data is entered using the PSJ_Jr. device connected to a PC that has been loaded with the FSUJ software. Note : The FSUJ screens shown in this section are presented in inverse black and white for clarity. WARNING : MAKE SURE THAT THE FSU’S CONFIGURATION DATA IS READ PRIOR TO WRITING THE NEW CONFIGURATION DATA. IF THE DATA IS WRITTEN BEFORE IT IS READ, ALL OF THE CONFIGURATION DATA ON THE CURRENT SCREEN WILL BE ERASED. BE SURE TO COPY THE STANDARD CONFIGURATION DATA TO A FLOPPY DISK FROM ANY FSU. THIS BACK UP FLOPPY CAN THEN BE USED TO RE-LOAD CONFIGURATION DATA THAT ACCIDENTLY GETS ERASED. Use the following procedures to configure an FSU: 1. Connect the PSJ_Jr. device to the PC running the FSUJ software. Attach the RS-232 connector to the COM1 port on back of the PC. 2. Make sure that the FSU’s power cable is disconnected. Then connect the FSU to be configured to the PSJ_Jr. device. Raise the connector cover and attach the special FSU connector to the the back of the FSU. Refer to Figure 4-11. Attach the other end of the cable to the connector on the PSJ_Jr. device labeled PS. 3. To execute the FSUJ software, double click on the f.bat icon. 4. Enter the password and the FSUJ Menu shown in Figure 4-2 displays.
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-17 Figure 4-2 : FSUJ Menu 5. Use the ↓ key to move the cursor to the WLLSO Setup option and press the Enter ↵ key. This displays a WLLSO Setup screen similar to the one shown in Figure 4-3. Figure 4-3 : WLLSO Setup Screen Without Configuration Data 6. To read the factory configured data, press the F2 key. On the screen, this key is labeled E2read.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-18 7. A confirmation box appears prompting execute to read to E2PROM. OK (Y/N). Enter Y. The screen is populated with the factory configured data. Refer to Figure 4-4. Figure 4-4 : WLLSO Setup Screen With Configuration Data Note : This application uses the letter A for zero. Zero is used for a delimiter. 8. Use the ↓ key to move the cursor to the PS-ID field, enter the new PS-ID number to be assigned to this FSU by striking over the old numbers. CAUTION : THE PS-ID NUMBER MUST BE UNIQUE ACROSS ALL PSs AND FSUs IN THE SYSTEM. 9. In a similar manner, enter the telephone number, the authentication key, operator ID, and the control carrier to be assigned to this FSU. 10. When the new configuration data is entered, press the F1 key. This key is labeled E2writ on the screen. A confirmation box appears prompting execute to write to E2PROM OK? (Y/N). Enter Y. The new configuration data is written to the E2PROM within the FSU.
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-19 4.3 Coaxial Cable Installation Once the locations for the antenna and the main unit have been determined, use the procedures in this section to install the cable. 1. Measure and cut a length of cable to fit between the main unit and the antenna. 2. Run the cable between the main unit and the antenna. 3. Using the cable stripper, strip both ends of the coaxial cable. Refer to the figure below for exact dimensions to strip. 6mm 6mm3mm Figure 4-5 : Stripped Coaxial Cable 4. Carefully mount the coaxial cable terminals onto the cable ends. 5. Affix the cable terminals using the crimper.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-20 4.4 Antenna Installation NOTE : The antenna shown in this manual is one of the three types of antennae used in the Airstar-WLL system. 1. Unpack the FSU Antenna and accessories. Make sure all parts are in good condition. The FSU Antenna and accessories are shown in Figure 4-6. (1) Antenna (1) Bracket(2) Bolt (M6)(2) Hexagon Nut(2) Spring Washer(4) Plain Washer(2) Screws(2) small Plain Washer(2) small Spring Washer Figure 4-6 : FSU Antenna and Accessories
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-21 2. Assemble the FSU antenna by attaching the bracket to the antenna according to Figure 4-7. Figure 4-7 : Antenna Bracket Assembly 3. After installing the antenna, use the PHS Signal Analyzer to check the receiving signal level. Measure the reception level (RX LVL) at the TNC connector on the FSU. Target values are as follows : • RX LVL: more than -78dBm (35dBµV) • Frame Error Rate: less than 2%
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-22 4. At the site selected for the FSU antenna, tentatively mount the antenna and take several RSS measurements approximately 15 cm from the antenna. Position the antenna where it receives that strongest signal. Then mount the antenna on a pole. Refer to the figure below for assembly of the bracket onto the pole Weep Hole Figure 4-8 : Antenna Mounted On Pole Note : Make sure that the weep hole is positioned at the lower edge of the antenna bracket as shown in Figure 4-8. 5. After installing the antenna, use the PHS Signal Analyzer to check the receiving signal level. Measure the reception level (RX LVL) at the TNC connector on the FSU. Target values are as follows : • RX LVL: more than -78 dBm (35 dBµV) • Frame Error Rate: less than 2%
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-23 WARNING : DEPENDING ON LOCATION, IT MAY BE NECESSARY TO GROUND THE ANTENNA TO PREVENT DAMAGE BY LIGHTNING. REFER TO THE FIGURE BELOW FOR A DIAGRAM OF THE EARTH CABLE CONNECTION. AWG 12copper wireinsulated6 inches above groundground line5 ft. by .5 inchcopper clad rodTerminal Lug Figure 4-9 : Earth Cable Connection 6. Attach a terminal lug to the lower bracket screw and tighten screw. 7. Plug insulated copper wire into the terminal lug and use the terminal lug crimper to affix the copper wire to the terminal lug. 8. Attach the other end of the copper wire to a copper clad rod as shown in the figure above.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-24 9. Connect the coaxial cable to the antenna as shown in Figure 4-10. Coaxial Cable Figure 4-10 : Coaxial Cable Connection to Antenna 10. Wrap the cable connection first with the self-adhesive rubber tape. Stretch the tape until it is ½ its original width. Then wrap the PVC tape around the rubber tape. 4.5 Main Unit Installation Follow the steps below to install the FSU Main Unit in the subscriber’s residence. 1. Unpack the FSU and accessories. Make sure all parts are in good condition. The accessories include : • AC Cord • AC/DC Adapter • Backup Battery Unit Figure 4-11 shows the FSU and its accessories.
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-25 Main UnitConnector Cover Figure 4-11 : FSU and Accessories
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-26 2. Connect the external antenna cable to the Antenna Cable Outlet located on the back of the FSU. Refer to Figure 4-12. Connector Cover Figure 4-12 : Antenna Cable Connection
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-27 3. Connect the telephone set to the RJ-11 jack on the back of the FSU using a standard telephone cord. See Figure 4-13. Figure 4-13 : Telephone Cord Connection Note : The telephone cord must have an RJ-11 type plug.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-28 4. Connect the Backup Battery Unit to the DC Input receptacle, also on the back of the FSU. NOTE : A fully charged backup battery allows the FSU to continue operation if power fails. The backup battery provides approximately two hours of talking time and approximately 20 hours of standby time. Recharging may take up to 30 hours. In the event of a prolonged power failure, remove the battery to avoid over discharging as this may shorten the battery’s life. Backup batteries must be replaced every 2 years. The batteries’ capacity decreases to 60% after 2 years , at approx. 25°C Figure 4-14 : Backup Battery Unit Connection
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-29 5. Connect the AC/DC Adapter to the Backup Battery Unit, as shown in the figure below. Figure 4-15 : AC/DC Adapter Connection
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-30 6. Connect the AC/DC Adapter to an AC outlet. Refer to Figure 4-16. The Monitor Lamp on the FSU should light, indicating the line is ready for use. If the Monitor Lamp blinks or does not light, adjust the antenna until the Monitor Lamp remains lit. If the Monitor Lamp does not light after antenna adjustment, contact a qualified service technician. Figure 4-16 : AC Outlet Connection
Fixed Subscriber Unit Installation Manual Installation Instructions Release 1.00 10/03/97 Airstar-Wireless Local Loop 4-31 7. If wall mounting is desired, locate a position on the wall for the FSU. Mark the screws’ locations using the enclosed mounting template. Mount the main unit on the wall using the supplied two screws. Refer to Figure 4-17. 84 mm Figure 4-17 : Wall Mounting 8. If wall mounting is not desired, be sure to affix the Antenna Cable to a stable surface such as a wall, a floor, or a table to insure that the FSU does not move by force of a loose antenna cable. 4.6 Antenna Orientation Adjustment If it is necessary to adjust the position of the antenna, follow the steps below to orient the antenna for better reception : 1. Loosen the bolts fastening the antenna to the bracket. 2. Connect the PHS Signal Analyzer to the antenna. It may be necessary to use the coaxial cable adapter (TNC-J/SMA-J). 3. Turn on the PHS Signal Analyzer’s power and turn the antenna to the direction with the maximum RSS level. 4. Tighten the fastening bolts.
Installation Instructions Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 4-32 Figure 4-18 depicts an FSU configuration in a subscriber’s residence. RFInterfaceTelephone Line InterfaceFSUStandard Telephone ConnectorTo AC OutletACAdapterBattery Figure 4-18 : Fixed Subscriber Unit Configuration
Fixed Subscriber Unit Installation Manual Acronym and Abbreviation List Release 1.00 10/03/97 Airstar-Wireless Local Loop 5-33 5. Acronym and Abbreviation List AC Alternating Current ADPCM Adaptive Differential Pulse Code Modulation BRSH Battery supply, Ringing Supervision, Hybrid BT Busy Tone C-channel Control Channel CO Central Office CODEC COde/DECode COT Central Office Terminal DC Direct Current D-channel Data channel DT Dial Tone DTMF Dual Tone Multi-Frequency FSU Fixed Subscriber Unit MDF Main Distribution Channel PHS Personal Handyphone System PS Personal Station RF Radio Frequency RP Radio Port RSS Received Signal Strength RSSI Received Signal Strength Indicator T-channel Traffic channel WLL Wireless Local Loop
Acronym and Abbreviation List Fixed Subscriber Unit Installation Manual 09/06/2001 Release 2.0 Airstar-Wireless Local Loop 5-34

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