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BT 2+8 Installation And Maintenance Manual
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BT 2+8 Installation And Maintenance Manual

BT 2+8 Installation And Maintenance Manual

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Installation and maintenance manual
2+8

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Summary of Contents for BT 2+8

  • Page 1 Installation and maintenance manual...
  • Page 3 Contents Introduction . 1-1 Central Control Unit 1.1.1 . 1-1 1.1.2 Systemphone . 1-1 Telephones 1.1.3 . 1-1 Modes of working 1.1.4 . 1-1 Ringing defaults 1.1.5 . 1-4 1.1.6 Electro-static Precautions (ESP) . 1-5 Installation procedures . 2-1 Equipment required 2.1.1 .
  • Page 4 Contents List of illustrations Fig. 1.1 Typical 2 8 system Fig. 2.1 CCU, Wall mounting Fig. 2.2 Terminating the 13A plug Fig. 2.3 Systemphone P/T switch location Fig. 2.4 CCU, Internal view 2-10 DIL switches Fig. 2.5 2-13 Fig. 2.6 Setting the line voltage feed links 2-14 Fig.
  • Page 5 Introduction Introduction is a microprocessor-controlled Hybrid Keysystem/PABX. See Figure It has an ultimate capacity for two exchange lines and eight 1.1. extensions. The is supplied complete as a system in its basic form and does not require any expansion hardware. CCU is a system (the CCU is virtually transparent to the serving exchange).
  • Page 6 Introduction Figure 1.1 Typical 2+8 system 8 ccu Mains supply Exc han ge line ( s ) Systemphone extension Telephone extension LJU2/1A External extension LJU2/1A Surge protection 1371Issue3(4/91)
  • Page 7 Introduction 1.1.4.1 PBX mode In PBX mode extension is designated as the operator position. Although not essential it is recommended that a Systemphone be fitted to extension to give visual status of the exchange line and extensions. All incoming calls and any extension keying after going off- hook will be routed to the operator position.
  • Page 8 Introduction Warn tone 1.1.4.4 Warn tone is provided to indicate an incoming call to the system where an extension user who would normally be in a position to take the call cannot because that extension may be: - programming - being rung - setting up an outgoing call.
  • Page 9 Introduction Electro-static Precautions (ESP) Ll.6 system contains electro-static components, to ensure long term reliability of the system. The only components that should be handled on the PCB are the IDCs, DIL switches and line voltage links. If the PCB or any other components are liable to be handled then the following precaution should be taken.
  • Page 10 Allow at least lOOmm of free space all round the CCU for ventilation purposes. The CCU will need to be within approximately two and a half metres of a dedicated mains power supply outlet. The 2+8 must not share the same mains supply socket with any other electrical appliance. Mounting the CCU 2.1.3...
  • Page 11 Installation procedures Figure 2.1 CCV, Wallmounting 260mm ---->l _;-== -- - © 1� m rn ----.i ______ ____ 205mm The CCU is mounted on the wall by inserting and setting the top two screws to the correct wall clearance, hanging the CCU on these two screws, and then inserting and tightening the bottom screw.
  • Page 12 Installation procedures The mains supply 2.1.4 Do not connect the mains supply to the CCU until all cabling and wiring is complete. WARNING Do not switch on the mains power to the system until you have read Section 4.1 Safety precautions and switch on. The CCU comes supplied with 3m of mains cable, which forms an integral part of the mains interference suppression components.
  • Page 13 The System phone has full loudspeaking capability, a number store, and LEDs to display the status of the exchange lines and extensions. For further details of the Systemphone please see the 2+8 Systemphone User's Guide. The Systemphone uses Pulse or TouchTone signalling. The selector...
  • Page 14 Installation procedures Extension telephones 2.1.6 The 2+8 is approved for use with (green spot) approved telephones, which may be connected to any extension. The system uses Master-type line jacks at the telephone instrument irrespective of the telephone or Systemphone used.
  • Page 15 Installation procedt.i. Connecting the extensions 2.1.8 For information the ringer equivalence number for 2+8 extension ports IJU 2/lA master jacks are required, one per extension. All extensions irrespective of whether they are using an approved telephone or System phone are 6-wire connected at the master jack.
  • Page 16 Installation procedures Figure 2.4 CCV, Internal view OIL switches (see fig 2.5) Mains transformer B C3I l'.51 B 10LK24V Line 2 c::i 24/SOV line feed links 9LK24V line 1 Exch � ng � line IDC for ell and extn cables Functional earth Extension line IDC Fuse...
  • Page 17 Connecting the exchange lines 2.1.9 CAUTION Do not connect the exchange lines until the 2+8 has been subjected to a pre-connection inspection. Feed the exchange line cable(s) through the CCU cable entry hole and terminate the A and B wires on the IDC terminals marked A and B on the main printed circuit board.
  • Page 18 2.1.12.1 The functional earth is separated from the Power Protective earth in the CCV. The functional earth for the 2+8 must be derived from the main building earth point and not from any 13A ring main. Current BT practices for functional earthing should be applied on all installations.
  • Page 19 Installation procedures Figure 2.5 DIL switches No lines Extension Extension equipage Ca llbarring Line 1 Callbarring Line 2 Extensions Extensions Extensions DODD DODD DDDDDDDD DDDDDDDD 51 0 D D D Spare Recall up =equipped up = barr up = barr Exchange line down= unequipped down =no barr...
  • Page 20 Set the mode of operation in accordance with the Mode of operation table in Figure 2.5. Forward recall type These switches are used to send one of four recall options from the 2+8 exchange line ports forward to the parent exchange or host PABX. The four options are as follows:...
  • Page 21 Installation procedures S8: No lines switch This switch sets the 2+S to work as a switching system without the exchange line ports connected. The 2+S can then be used as a switching system on its own, totally independent of the exchange lines, but using the extension ports only.
  • Page 22 2.1.1s 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 Systemphone. This means that the power feed and data information from the CCU to the System phone are not possible, resulting in the loss of the LED line, extension status and the loudspeaking operation.
  • Page 23 Installation procedures Figure 2. 7 Connections for an answering machine 8 Systemphone LJU10/3A (doubler) Wall socket LJU 2/1A Leave telephone socket empty � Answering machine TPU 1371Issue3(4/91) 2-14...
  • Page 24 {piggy-backing) Before connecting 2+8 to a host PABX the approved maintainer should be consulted. 2+8 may only be attached to P ABXs given in List C of the DTI document 84011 I. When the 2+8 is connected to a host PABX, it is a mandatory...
  • Page 25 At first the Systemphone LEDs will all light up, and eventually the line LEDs will be extinguished. When the 2+8 is in an idle state all LEDs on System phones should be • extinguished. If the exchange line LED (s) remain on, this means that either the exchange line port(s) do not have lines connected or the line voltage feed straps may need to be set.
  • Page 26 Programming Programming The programmable features of the are as follows: - Night service on/ off - Ringer on/ off - Speak on/ off. Programming instructions for all system features are given in the Systemphone and Extension telephone user's guides. Following a power failure the programming is lost and must be re-entered.
  • Page 27 Commissioning the sys t em Commissioning the system The following sections can be used as a guide to testing the system prior to handover of the 2+8 to the customer. These are: Commissioning procedure with lines connected (maintenance • replacement of CCU).
  • Page 28 Switch off the mains power and check the operation of the power fail extensions 20 and 21. Restore the mains power and check that the system is fully operational. Return the completed 2+8 Customer Configuration Form to the customer. Commissioning procedure prior to lines 6.1.2...
  • Page 29 Switch off the mains power and check the operation of the power fail extensions 20 and 21. Restore the mains power, and check that the system is fully operational. Return the completed 2+8 Customer Configuration Form to the customer. Commissioning procedure with no lines 6.1.3...
  • Page 30 If the customer's 2+8 system suffers from repeated lock-ups or crashes for no apparent reason, ask the customer if any other electrical appliance is being switched on or off at the time the system stops working. The 2+8 has designed-in mains interference suppression, line surge protection, and electrostatic discharge immunity.
  • Page 31 Faulting and maintenance Figure 7.1 Faulting flowchart Start Is the system completely dead? Does the fault effect all extensions? Power down CCU for 2 seconds then power up to reset system Power down CCU for 2 seconds then power Change telephone o/k? up to reset system o/k?
  • Page 32 ringing Tones and Tones and ringing Tone Frequency Cadence Internal dial tone 440/350Hz +/-0% Continuous Engaged tone Sec. ON Sec. OFF 425Hz 0.72 0.72 Ring tone 425Hz 1111 1.26 Sec. OFF 0.54 Sec. ON Sec. OFF Sec. ON 0.18 0.90 Special dial tone 425Hz 11 11...
  • Page 33 Numbering plan Numbering plan Call extension 20 (Operator service) Night service on Night service off lst Extension 2nd Extension 3rd Extension 4th Extension 5th Extension 6th Extension 7th Extension 8th Extension Extension reset Ring back when free Exchange line 1 Exchange line 2 Call Park Ringer on, line port 1...
  • Page 34 The 2+8 should be installed in accordance with BS 6701:Parts 1 and 2. • In order to provide a visual indication of the status of the lines of the 2+8 • system, it is recommended that at least one extension instrument be a System phone.
  • Page 35 Payphones are not suitable for connection to the 2+8. • The 2+8 is designed for 240V 50Hz mains supply. • The 2+8 control unit and Systemphones have been designed to work in • an office-type environment and with the following specific design limitations: - operating temperature o· 4o·c - storage temperature -20·...
  • Page 36 Notes Notes 10.2 10-3 1371Issue3(4/91)
  • Page 37 Notes TPU 1371Issue3(4/91) 10-4...
  • Page 38 Notes 10-5 Issue 1371 3 (4/91)
  • Page 39 Published by British Telecom Technical Publications. All possible care has been taken in the preparation of this publication, but British Telecommunications plc accepts no liability for any inaccuracies that may be found. British Telecommunications plc's policy is one of continuous improvement and it may make changes without notice both to this publication and to the product which it describes.
  • Page 40 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.