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Offices in Africa, the Americas;

Australasia, the Middle East,

the Far East and Europe.

The telecommlllliications services described in this publication
are subject to availability and may be modified from time to time
Services and equipment are provided subject to British

Telecommunications pie's respective standard conditions of contract.
Nothing in this publication forms any part of any contract.

©British Telecommwiications pie

1991.

Registered office: 81 Newgate Street. London EClA

71\l.

Registered in England No. 1800000

Printed in England. TPU 1371Issue3

(4/91)

Summary of Contents for 2+8

Page 1: ...Installation and maintenance manual 2 8...

Page 2: ......

Page 3: ...2 1 11 External extensions 2 1 12 Earthing 2 1 13 Setting the CCU DIL switches 2 1 14 Line voltage feed 2 1 15 Answering machines with Systemphones 3 1 Subsidiary connection piggy backing 4 1 Safety p...

Page 4: ...one P T switch location Fig 2 4 CCU Internal view Fig 2 5 DIL switches Fig 2 6 Setting the line voltage feed links Fig 2 7 Connections for an answering machine Fig 7 1 Faulting flowchart List of table...

Page 5: ...ed by the system Break jacks are provided on the exchange line IDCs i i 2 Systemphone The 2 8 Systemphone is exclusive to the 2 8 system having full LSr operation direct selection and display status o...

Page 6: ...Introduction Figure 1 1 Typical 2 8 system Mains supply 4 2 8 ccu Exchange line s Systemphone extension Telephone extension LJU2 1A External extension LJU2 1A Surge protection 1 2 TPU 1371Issue3 4 91...

Page 7: ...hange line 1 will ring extension 20 and any other extension which has its ringer programmed on It is also the power fail extension for line 1 Incoming calls on exchange line 2 will ring extension 21 a...

Page 8: ...ch on when in Keysystem Mode the CCU sets all extensions to ring if an incoming call arrives Individual extensions can be prevented from ringing by programming them off The ringer default on is a mand...

Page 9: ...PCB or any other components are liable to be handled then the following precaution should be taken Wrist straps Before handling printed circuit boards or components a wrist strap must be worn and conn...

Page 10: ...ion such as heavy electrical switch gear for example lift machinery or electric arc welders should be specifically avoided Allow at least lOOmm of free space all round the CCU for ventilation purposes...

Page 11: ...can be slid out from under the screw heads 2 Loosen the CCU top cover transit retaining screws and lift to remove the cover completly 3 Remove the top cover metal transit retaining screws and replace...

Page 12: ...nt if you need to re terminate the mains plug for maintenance purposes Terminate the mains lead with a 13A plug approved to the requirements ofBS1363 and the Statutory Instrument 1987 No 603 Consumer...

Page 13: ...ide The Systemphone uses Pulse or TouchTone signalling The selector switch which is of the rotary type is located under the Systemphone as shown in Figure 2 3 Use a small screwdriver to alter the sett...

Page 14: ...ment details the separation requirements between telecommunications cables and cables carrying mains supply voltages Generally the route chosen must be such that Telecoms cables must not be drawn into...

Page 15: ...cation Pass the cable through the cable entry hole in the CCU and terminate the extension wiring in accordance with the following table Table 2 1 CCU to Master Jack Extension wiring 2 1 8 1 CCU Extens...

Page 16: ...B C3I l 51 B 10LK24V Line 2 c i 24 SOV line feed links 9LK24V line 1 a 11 Exch ng line IDC terminations 1 a s i5lt 3J a i s a a BIS __ O _ J Entry point for ell and Mains interference suppression Mai...

Page 17: ...confines of the customer s premises and the system s operational limits See Section 10 1 Statutory information Care should be taken when selecting external cable routes to ensure that the cabling com...

Page 18: ...ed the functional earth wire into the CCU and terminate securely on the functional earth terminal see Figure 2 4 provided on the CCU PCB CAUTION Do not use excessive force when tightening this screw 2...

Page 19: ...2 Recall PABX Down Down ELR Keysystem Down Up TBR 600ms TBR 250ms Exclusive line Up Down TBR95mms Exchange lines SS Ring bridge One exchange line only Up Short Bothexchange lines equipped Down Long No...

Page 20: ...ll 600 milliseconds Set S3 or S4 in accordance with the Recall table in Figure 2 5 The 95 millisecond setting must be used in the UK The remaining options are provided for use only in other countries...

Page 21: ...switch bank 2 1 13 3 Switch bank SW3 Call barring line 1 This switch bank consists of eight switches numbered from Sl to SS which correspond to extensions 20 to 27 respectively Set the switch up if th...

Page 22: ...hones The series method of connecting telephones to answering machines such as the BT Kingfisher and Wren does not allow the continuation of all five wires from the extension socket to a 2 8 Systempho...

Page 23: ...ure 2 7 Connections for an answering machine TPU 1371Issue3 4 91 2 8 Systemphone Leave telephone socket empty _L_ 1 I V Answering machine LJU10 3A doubler Installationprocedures Wall socket LJU 2 1A 2...

Page 24: ...change line port of the 2 8 The connection details are the same as those given in paragraph 2 1 9 for the exchange line except that for Exchange line read Host PABX It will be necessary to select the...

Page 25: ...a Systemphone connected The CCU cover has been replaced Switch on the mains power and allow at least 15 seconds for the CCU to go through its power up routine At first the Systemphone LEDs will all li...

Page 26: ...as follows Night service on off Ringer on off Speak on off Programming instructions for all system features are given in the 2 8 Systemphone and Extension telephone user s guides Following a power fai...

Page 27: ...ank SWl Also ensure that all switches in all four banks are set as required see Section 2 1 13 Setting the CCUD Lswitches 4 Replace the CCU cover and follow the instructions in Section 4 1 Safety prec...

Page 28: ...switches in all four switch banks are set as required see Section 2 1 13 Setting the CCUD Lswitches 4 Replace CCU cover and follow the instructions in Section 4 1 Safety precautions and switch on 5 Ch...

Page 29: ...and telephones are set as required 3 Set switch 8 to the up position in the configuration Switch bank SWl Also ensure that all switches in all four banks are set as required see Section 2 1 13 Settin...

Page 30: ...at the time the system stops working The 2 8 has designed in mains interference suppression line surge protection and electrostatic discharge immunity However it is not possible to protect the system...

Page 31: ...et system I o k I yes no I yes I Check mains supply to CCU I yes o k no I Check fuses in mains plug and CCU I o k I I no I Change CCU no I Does the fault effect all extensions I no I Change telephone...

Page 32: ...one 425Hz 11 11 1 26 Sec ON 0 18 Sec OFF Warn tone 425Hz II II 1 08 Sec ON then OFF Confirmation tone 425Hz 0 18 Sec ON 0 18 OFF 0 18 Sec ON 0 18 OFF 0 18 Sec ON 0 54 OFF Number unobtainable 440Hz Con...

Page 33: ...n 23 4th Extension 24 5th Extension 25 6th Extension 26 7th Extension 27 8th Extension 30 Extension reset 40 Ring back when free 41 Exchange line 1 42 Exchange line 2 5 Call Park 61 Ringer on line por...

Page 34: ...nes of the customer s premises and that the distance of the extension instrument from the 2 8 Control Unit does not exceed the followng limits when using 0 5mm 2 copper conductor 150m for 2 8 Systemph...

Page 35: ...n resistance of the functional earth is 50 n The current feed from the extension ports is in the range of 22 to 28ma The best overall performance of the system will be obtained by using approved exten...

Page 36: ...Notes 10 2 Notes 10 3 TPU 1371Issue3 4 91...

Page 37: ...Notes TPU 1371Issue3 4 91 10 4...

Page 38: ...Notes 10 5 TPU 1371 Issue 3 4 91...

Page 39: ...vement and it may make changeswithout notice both to this publication and to the product which it describes O British Telecommunications plc 1991 Please do not reproduce transmit transcribe store in a...

Page 40: ...d may be modified from time to time Services and equipment are provided subject to British Telecommunications pie s respective standard conditions of contract Nothing in this publication forms any par...

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