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British Telecom ESCORT System Manual

2 + 6 switching system
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ESCORT 2 + 6

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Summary of Contents for British Telecom ESCORT

  • Page 1 ESCORT 2 + 6...
  • Page 3 BRITISH TELECOM CUSTOMER PREMISES EQUIPMENT E S C 0 R T S T E M MA NUAL Page of 33...
  • Page 4 ESCORT SYSTEM MANUAL Published by British Telecom Customer Premises Equipment. All possible care has been taken in the preparation of this publication, but British Telecommunications plc accepts no liabilty for any inaccuracies that m ay be found. BT Customer Premis es Equipment reserves the right to make c hanges w ithout notice both to this publication and to the product which it describes.

  • Page 5: Table Of Contents

    CONTENTS General Capacities, sizes and weights Installation Location of the CCU Installing the CCU Cabling and wiring 3.3.1 Connecting the exchange lines 3.3.2 Connecting the extensions 3.3.3 Functional earth connection 3.3.4 Connecting the mains supply Installing the key modules and telephones 3.4.1 Numbering the extension keys Setting the option switches...
  • Page 6 System architecture Control Switching matrix Power supply Intercom power supply Tone generators Exchange line interface circuit Extension interface circuit Voltage comparator circuit Ringing generator 7.10 Incoming exchange line call Specification o f 3 3 P a g e...

  • Page 7: General

    Sub s i d i a r y Connection d ocument 011. system suitable connection to PABX's giving a continuous ringing signal . FIG .1.1 SYSTEM CONFIGURATION ESCORT CCU MAINS SUPPLY EXCHANGE LINES >-CABLE EQUIP 2503- WU-(IA "' WU-(1 A ·-·...

  • Page 8: Capacities, Sizes And Weights

    CAPACITIES, SIZES AND WEIGHTS m ax i m u m capacities sys t e m fol l o w s:- Ex change lines Extensions Intercom circuits The CCU has the following dimensions and weight: height 225mm width 320mm depth 85mm weight 4 Kg (approx)
  • Page 9 FIG_3_ GENERAL ARRANGEMENT OF CCLI 3hown with upper cover in place and low er cover removed. UPPER COVER UPPER COVER RELEASE CATCH RELEASE CATCH � � � SPARE FUSE SOOmA ANTISURGE ENTRY FOR OPTION MAINS CABLE SWITCHES BASE TO WAL LPL A TE SE CUR ING SCREW ENTRY FOR EXTN.

  • Page 10: Cabling And Wiring

    T h e f r ont cover p a r t s , on-site insta llation and maintenance only the lower cover needs to be removed. Loosen the two large recessed screws on the front of the unit and remove the lower cover. Remove the cross-headed securing screw adjacent to the bottom right hand corner of the lower PCB, release the mounting...

  • Page 11: Connecting The Exchange Lines

    3 . 3 .1 Connecting the exchange lines R u n wire cable ex change l i ne h ost c o nne c t i o n p o i n t te rminate e x c hange l i ne terminal strips in the CCU as shown in f ig.3.3.
  • Page 12 FIG.3.3 CONNECTING THE EXCHANGE LINES CCU EXCHANGE LINE TERMINAL STRIP BCD� used cable equip 25 03- 'W' - B C if re uired .5mm earth wire to other excha09e line if requirttd • ·o · terminal Locally provided amp block connector Note For earth recall, provide functional earth and strap B - C NOTE...
  • Page 13 FIG. 3.5 CONNECTING THE MAINS SUPPLY TO THE CCU CCU MAINS CONNECTOR Bro'W'n wire 2 core, 5 amp maims f I ex Blue wire NOTE. The CCU does not require a mains protective earth. FIG.3.6 CONNECTING A 13AMP PLUG 13 AMP PLUG Blue wire Page 11 of 33...

  • Page 14: Connecting The Mains Supply

    3.3.3.l Earth recall On each exchange port requiring recall, strap together terminals and C. Earth recall will be given when the extension presses the mode button on an established call. Two wire extensions may be provided with earth recall one of two ways: if the extension has been provided over a 6 wire connection the white-orange wire may be connected locally...

  • Page 15: Setting The Option Switches

    LAYOUT OF THE KEY MODULE EXCHANGE LINE BUTTONS EXCHANGE LINE LAMPS LIFT 'W' INDO'W' MOOE FROM THIS BUTTON CO R NE R � u N t i L1 N u fscort nucoM LIFT 'W' INDO'W' FROM THIS CORNER REMOVABLE LABlE EXTENSION BUTTONS Positron for note pad...

  • Page 16: Telephones

    50 ohm loop resistance, this is equivalent to 300m of 0.5 copper cable. 3 .7 EXTENSION BELLS The ringing generator on Escort is designed to ring all extension ports simultaneously provided that the Ringer Equivalent Number...

  • Page 17: Divert

    3.8.2 Divert t h e sys te m's d i v e r t fac i l i t y l i m i t ed f i xed div ersion tab le , ie extension only diver t calls extension it is impor tan t that the extension n u m bers are allocated...

  • Page 18: Supervisory Signals

    SUPERVISORY SIGNALS RINGING SIGNALS 4.1. The system provides three distinct ringing cadences, all of which are announced by the extensions telephone. SIGNAL CADENCE Internal ringing sec."ON", sec."OFF" Reminder ringback sec."ON", sec."OFF" Exchange ringing Echoes exchange ringing cadence LAMP SIGNALS Each e xchange l i n e key on the key m o dule is associated with an LED, will be in one of five states: SIGNAL...

  • Page 19: Facilities

    FACILITIES FACILITIES LIST Receive and originate exchange line calls with secrecy Receive and originate non-secret intercom calls Exchange line hold Reminder ringback on hold Enquiry Transfer exchange calls Call diversion Internal conference Exchange line conference Call Shut tle(broker service) Programmed exchange line ringing Visual indication of exchange line status Call waiting tone Capability of labelling keys...

  • Page 20: Incoming Exchange Call

    5.2.2 Incoming exchange call An incoming exchange call is announced visually at every station, exchange calling line flashing at the exchange ringing cadence. The call will also be announced audibly at the exchange cadence, each station that been programmed ring incoming calls on that line.

  • Page 21: Enquiry

    The line may be reseized at any ti me by pressing line key again. The exchange LED reverts to a steady 'ON' condition. The exchange line may be incoming or outgoing and there is n o limit to the number of times a call may be held. Any station may hold both exchange lines if required.

  • Page 22: Call Transfer

    5.2.6 Call transfer Any station may transfer an exchange line call to any other station, the exchange line call may be incoming or outg oing and there is no limit to the number of times it may be transferred. To transfer a call, an enquiry call is first established to the station to which the call is to be transferred, as descibed in 5.2.5.

  • Page 23: Conference

    5.2.7 Conference 5 .2.7.1 Exchange line conference An exchange line conference call may be se t up between exchange line and any two E scort extensions, exchange line call may be incoming or outgoing . station extend exchange line call into ·...
  • Page 24 5.2.8 Call divers ion Any station may arrange for calls to his station to be diverted to another station as shown in the table below, no other diversions are possible. For the duration of the divert all incoming calls for the diverting station will call the host.

  • Page 25: Programming Exchange Ringing

    Programming exchange ringing 5.2.9 Each station program his telephone bell respond to calls on one or both exchange lines subject following restrictions: When the system is first powered u p station 1 rings to i n c o m i n g c a l l s l i n e s t a t i o n...
  • Page 26 STANDARD DIVERT All calls for extension 4 diverted to extension (not extension 2 as described in section 5.2.8.). Extension 1 may both m ake and receive calls on line 2 for the duration of the divert. To invoke standard divert: Lift the handset Press and release the 'mode' key...

  • Page 27: Two Wire Extensions

    5.2.11 Two wire extensions or 3 may both be configured as simple Extensions 1 and telephones without key modules, these extensions are limited to the facilities of making and receiving calls. Extension 1 will ring to incoming calls on exchange line but extension 3 does not ring to incoming c al l s on either line.

  • Page 28: Systems Connected To A Pbx

    PABX signal . This is because Escort only senses an extension off-ho ok condi t ion during off p erio ds of any incoming ringing cadence . Recall If the system i s conf i g ured for earth recall, pressing...

  • Page 29: Power Fail

    5.2.13 Power fail Failure of the mains supply will result in station being connected to exchange line and station being connected to exchange line All other stations and facilities will be inoperative. Calls in progress at t he time of failure may be lost, but no call will be interrupted when power is restored.
  • Page 30 T ABLE SYSTEM FAULT LOC ATION ACTION POSSIBLE FAULT SYMPTOM Loss of power 1) check fuse System in mains supply 2) check incoming fail. mains supply Failure of power change CCU supply or control circuits telephone speech check using Speech or sig­ circuit test telephone nalling fault on one...

  • Page 31: Transportation

    Note the position of the switches and lin ks in the faulty unit, and set the switches and links in the replacement unit to the same setting. 6.3.2. Transportation The CCU should be handled with care and be transported with the cover in place in the packing of the replacement item.

  • Page 32: Intercom Power Supply

    INTERCOM POWER SUPPLY 7.4. Power for the intercom circuit is provided from the + 22 volt o utputs of the power supply which are fed via a noi e r ed uct ion circuit and constant current sources. 7.5. TONE GENERATORS The control circuit gener ates a 500 Hz tone which is fed onto the intercom circuit in cer t ain circum stances to indicate that an...

  • Page 33: Incoming Exchange Line Call

    INCOMING EXCHANGE LINE CALL As an example of the system operation, the handling of an incoming exchange line call will now be described. the i n c o m in g ringing f ro m exch a n g e l i n e w ithin specification,...
  • Page 34 FIG_ 7 _ 1 EXCHANGE LI NE INTERFACE component numbering shown for exchange line 1 RLR - Recall relay RLH - Hold relay to control circuit ----0 ii• RLLD1 not used ring detect +22v RLR1 C701 C702 to exchange line to relay matrix loop detector...

  • Page 35: Specification

    SPECIFICATION 180-260v ac, 50Hz Mains supply Power consu mption 30W max. Di mensions width 320rnrn, height 225m m, depth 85mm. Weight Environment Normal operation -5 to 45°c, with max. humidity 95% non-condensing. Storage -20 to 60°c Line conditions Total de loop resistance between an y...

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