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British Telecommunications (BT) Senator, System Manual

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2.2 

2.2.1 

2.2.2 

2.4 

INSTALLING THE 

CCLI 

Preparation 

Fitting the rear 

mounting assembly 

Part  2  INSTALLATION 

The  CCU should 

be 

wall mounted on a suitable  flat,  sound surface. This 

should 

be 

within 3m of a mains socket outlet and should allow the  CCU to 

be clear of the floor and any obstructions. It  should not be installed in the 
vicinity  of  any  equipment  liable to cause radio frequency  interference e.g. 
arc welders etc. 

First remove the front cover and the case from the rear mounting as follows: 

Remove the fixing  screws in  the top left and right hand comers of  the 

front cover. 

Ease the top of the  front cover away  from the  case,  lift the cover clear 
and disengage the lugs from the  slots in the  case. 

With the cover  removed, remove the two  screws holding the case to 
the rear mounting,  sec Fig 2.1. 

Ease the lower edge of  the case away  from the rear mounting, lift  the 
case clear and  disengage the  lugs from the slots at the top of the rear 
mounting. 

Drill and plug  two holes,  for No.JO woodscrews, at a suitable height 
above the  floor or any  obstruction.  The  two  holes  must be 495  mm 
apart horizontally. 

Fit, but do not fully  tighten, No. 

I 

0 wood screws into  these plugged 

holes. 

Offer the rear mounting assembly  to the wall so that  the two screws 
enter the 'keyholes'  in the top corners of  the  assembly. Slide  the 
mounting so that the  screws are in the slotted  portion of the  'keyhole'. 

Check that the mounting assembly  is horizontal and  adjust if 
necessary.  Mark the wall  through the lower fixing holes. 

Remove the rear mounting assembly  from the wall, drill and plug the 
lower fixing holes for No.10 woodscrews. 

Feed the free end of the  mains cable through the entry  hole in the rear 
mounting assembly  from the rear, see Fig 2.1. Leave about 220mm of 
cable free at the front of the mounting assembly. 

Refit the rear mounting assembly to the wall and tighten all  fixing 
screws. 

CPE/MS 526 Issue 2 (12/88) 

Summary of Contents for Senator

Page 1: ......

Page 2: ......

Page 3: ...British 1 EL ECO System manual ...

Page 4: ...e write to BT Technical Publications lstFloor Anzani House Trinity Avenue FELIXSTOWE Suffolk IPll 8XB Telex 987062 BTANZ G Fax 0394 693257 British Telecommunications pie 1988 No part of this publication may be reproduced rransmitted rranscribed stored in a rerrieval system or translated into any human or computer language in any form by any means without the prior permission of British Telecommuni...

Page 5: ...ommissioning Procedures 4 1 Part 5 Facilities and Operating Procedures 5 1 Part 6 Power Fail Arrangements 6 1 Part 7 Maintenance 7 1 Part 8 How it Works 8 1 Part 9 Parts List of Current Equipment for Senator 9 1 Part 10 Auxiliary Equipment 10 1 Part 11 Documentation 11 l Part 12 Specification 12 1 CPE MS 526 Issue 2 12 88 111 ...

Page 6: ...SENATOR SWITCHING SYSTEM iv CPE MS 526 Issue 2 12 88 ...

Page 7: ...Central Control Unit CCU which houses the system power unit the main elements of the control circuits and terminations for the lines The CCU has a power consumption of 200 watts and the customer must provide a suitable 13A mains socket outlet for it Fig 1 SENATOR TELEPHONE AND CENTRAL CONTROL UNIT SENATOR is available for LOOP DISCONNECT or MF4 signalling systems and can be used on any of the foll...

Page 8: ...Part 1 GENERAL DESCRIPTION 1 2 CPE MS 526 Issue 2 12 88 ...

Page 9: ... 2 2 1 Preparation 2 2 2 Fitting the rear mounting assembly 2 3 FITTING THE POWER SUPPLY UNIT PSU 2 4 FITTING THE APPARATUS SLIDE IN UNITS 2 4 1 Refit the case 2 4 2 Fitting the apparatus slide in units ASU 2 5 CABLING 2 6 EXCHANGE LINE AND EXTENSION WIRING Page 2 3 2 4 2 4 2 4 2 5 2 7 2 7 2 7 2 8 2 11 2 1 ...

Page 10: ...Part 2 INSTALLATION 2 2 CPE MS 526 Issue 2 12 88 ...

Page 11: ...onal Extension Line ASUs that are required for the system The Rear Mounting Assembly see Fig 2 1 contains the Backplane which is the main printed circuit board PCB carrying the microprocessor circuitry sockets for up to seven Line Intercom ASUs and a secondary PCB which carries the termination blocks for exchange line and extension cable terminations The CCU must never be transported with the Powe...

Page 12: ...e rear mounting lift the case clear and disengage the lugs from the slots at the top of the rear mounting Drill and plug two holes for No JO woodscrews at a suitable height above the floor or any obstruction The two holes must be 495 mm apart horizontally Fit but do not fully tighten No I 0 woodscrews into these plugged holes Offer the rear mounting assembly to the wall so that the two screws ente...

Page 13: ...he slot at the left hand side of the rear mounting assembly Pivot the PSU on the tab to swing into the rear mounting assembly Align the screw holes in the top surface of the PSU with holes in the rear mounting assembly Replace and tighten the two countersunk screws through the holes in the rear mounting to secure the PSU Voltage Selector Plug Mains Power Supply Cable Fitted with 3 Pin Plug fused a...

Page 14: ...ng Terminate the mains cable to a 13 amp 3 pin plug fused at 3 amps following the standard colour code Brown to L or LIVE Blue to N or Neutral Green Yellow to E or Earth Do not plug in at this stage Insert the power unit output plug into the socket provided on the Backplane The plug is polarised and can only be inserted one way Set the voltage selector to the correct input voltage which will norma...

Page 15: ...ar mounting Swing the case into position Fit and tighten the case fixing screws Fit the plate carrying the spare fuses in their carriers to the screws at the lower edge of the PSU This plate covers the gap between the PSU and the case to prevent accidental contact with the mains connections See Fig 2 5 The Exchange Line ASU the Intercom ASU and the Extension ASUs can now be fitted Each is carefull...

Page 16: ...ENSIONS 9 10 ASU DPA 1209 A NOTE Orange handled extension ASU is installed when inter PBX adaptor is used SENATOR uses four wires between the telephone sockets UU No 3A and the CCU The four wires comprise two speech wires and two data wires It has been found that quad formation four wire cables cause overhearing between the speech and data pairs so although two wires are spare 6 wire Cable Equipme...

Page 17: ...9141 IW Item code 033568 or 9142 lW Item code 033569 should be made between the earth screw terminalto a proven building earth point This wire is in addition to any earth provided for recall SENATOR CENTRAL CONTROL UNIT 2 4 0v AC fuse d 1111 3 0lll _ a _ m p Exch lines or PBX Extns __________ ___ Cable equip 2503 F LJU Bell Adaptor l Tele85 LJU no 3A Tele85 EXTENSION Extn Bell Adaptor SA 10255 Ext...

Page 18: ...ALLATION a w w _ _ a a c 0 0 a I l a w __J C I W z 1 o o f Z 0 z l LL Cl w z J w CJ z I 0 x w I l a UJ __J UJ Zi 00 f z 0 z l LL Fig 2 7 SENATOR CONNECTION OF A C POWER EXCHANGE LINES AND EARTHS CPE MS 526 Issue 2 12 88 ...

Page 19: ...rom the Senator Back Plane The two spare wires should be insulated and must not be used to connect other circuits unless otherwise specified Terminate the exchange lines and extensions on all appropriate connector blocks These are labelled on the PCB Note that exchange line blocks have three terminals these being A and B wires and Earth used for PBX recall Extension blocks have four terminals A an...

Page 20: ...s s I 0 Q l s l l 0 0 tD z tD 0 0 z Ol 11 s 0 0 0 0 w Part 2 INSTALLATION 2 s ci z i LL J 0 l l N i a i a w w _J ro t u 0 s tD s tD s I 0 0 0 0 11 0 0 0 0 I I 0000 u tD tD tD w D w z x 7 u tD I I tD w 0 0 0 0000 z Q l Fig 2 9 CONNECTION OF SENATOR EXTENSIONS CPE MS 526 Issue 2 12 88 ...

Page 21: ...CPE MS 526 Issue2 12 88 Part 3 THE TERMINAL Contents 3 1 3 2 3 3 3 3 1 SENATORlOANDSENATORSUPERlO REFURBISHEDTERMINALS OLD VERSIONS OF SENATORTERMINAL Handset No 16 page 3 3 3 4 3 4 3 4 3 1 ...

Page 22: ...Part 3 THE TERMINAL 3 2 CPE MS 526 Issue 2 12 88 ...

Page 23: ...y a group of five blue buttons for the exchange lines with the hold and divert keys and their associated LEDs being grouped with the other secondary function keys NOTE A template for wall mounting is included in the user guide and screws with wall plugs are provided with each terminal Senator Super 10 dark grey has the same facilities as Senator 10 with the addition of full hands free working The ...

Page 24: ...nect signalling SENATOR Telephone 8520 LD loop disconnect signalling SENATOR Telephone 8521 LD 10 address repertory dialling Handset 16B was used on Teles 8550 8551 and 8553 This is distinguishable from the Handset 16A by its pepper pot earpiece and a small recess under the earpiece Facility handsets were available for use on Teles 8520 8521 and 8530 only Handset 16C amplified handset with volume ...

Page 25: ...telephone Press and hold down the HOLD button All the red Exchange Line LEDs should light to indicate that the extension will ring for incoming calls on every line The LEDs will not light if the data pair is reversed Pick up the handset and listen for system dial tone a continuous two tone sound Test the keypad by keying the extension s own number and listening for the engaged tone Check the opera...

Page 26: ...Part 4 COMMISSIONING PROCEDURES 4 2 CPE MS 526 Issue 2 12 88 ...

Page 27: ...o nominate extensions 1 to 5 5 5 3 To nominate extensions 6 to 10 5 5 4 While in Divert 5 6 EXCHANGE LINE CONFERENCE CALLS 5 7 TEN ADDRESS REPERTORY DIALLING 5 7 1 To store a number 5 7 2 To send a stored number 5 7 3 To erase a stored number 5 7 4 To change a stored number 5 8 REPETITION OF LAST NUMBER KEYED 5 8 1 To repeat the last number called 5 9 INTERCOM CALLS Page 5 3 5 3 5 3 5 3 5 4 5 4 5 ...

Page 28: ...5 2 Part 5 FACILITIES AND OPERATING PROCEDURES CPE MS 526 Issue 2 12 88 ...

Page 29: ...the LED associated with the line button either Glowing steadily indicating a call in progress Flashing at ringing cadence indicating in incoming call Flashing at the Hold cadence to indicate a Call Held condition An extension can make an exchange line call on any line which is free On lifting the handset system dial tone will be heard if there is a free intercom circuit When the button associated ...

Page 30: ...nge line which is held by the CCU The exchange line LED flashes at the HOLD cadence at all extensions The extension user may make an intercom call or a call on another exchange line At the completion of this call the extension user may return to the Held exchange line by repressing that exchange line button If an extension puts an exchange line into HOLD and subsequently replaces the handset then ...

Page 31: ...other Extensions connected via IPBX or External Extension adaptors cannot use this facility An extension must make or receive an exchange line call before a conference call can be set up by using the following procedure Put the exchange line into HOLD and call the extension which is to join the conference call When the extension answers he indicates his willingness to join the conference by pressi...

Page 32: ...exchange line button to seize a free exchange line On receipt of exchange dial tone depress and release button T Depress and release the digit button under which the required number is stored Lift the handset Depress and release button P Depress and release the digit button under which the number to be erased is stored Replace the handset It is not necessary to erase a stored number before replaci...

Page 33: ...ve ring tone When the called extension lifts the handset the intercom call is established If the called extension is not connected to the system N U tone will be received When an extension user encounters engaged tone for another extension he can either clear down and try again later or use the camp on busy facility by continuing to hold the connection As soon as the other extension becomes free i...

Page 34: ...g call but an extension bell connected via a Bell Adaptor will not operate When two extensions are connected to one exchange line bell tinkle will be experienced at one telephone when the other dials Intercom calls cannot be made during mains failure nor can calls be transferred Any programmed facility e g Divert or Exchange Line Ringing will be cancelled and will need to be reprogrammed when powe...

Page 35: ...ity E XTN l EXTN 2 I I RELAY k MAT IX I I DATA C C T I I I n z x w j n z x x w w EXTN 5 I EXTN 6 I RELAY MATRIX I I T DATA CCT I I I z x w z x w z x w I XTN g I EXTN 10 k l I RELAY MATA X I I DATA CCT I I I tii RIBBON CAI SPEE OAT SPI E DAT SPEE DAT SPF E DAT SPEE OAT SPEE DAT SPEE OAT SPEE OAT SPEE 0AT1 SPE E OATi r RIBBON CABLE Ll CH EXTN 10 CH E XTN 9 H EXTN 8 c EXTN 7 CH EXTN 6 CH E XTN 5 CH f...

Page 36: ... SITE MAINTENANCE 7 3 7 2 TEST CONDITIONS 7 3 7 3 FUNCTIONAL TESTING 7 4 7 4 FAULT DIAGNOSIS 7 4 7 5 POWER UNITS 7 6 7 6 ASU CHANGEOUT 7 6 7 7 BACKPLANE 7 6 7 8 MAINTENANCE EXCHANGE 7 7 7 9 SYSTEM REPLACEMENT 7 7 CPE MS 526 Issue 2 12 88 7 1 ...

Page 37: ...Part 7 MAINTENANCE 7 2 CPE MS 526 Issue 2 12 88 ...

Page 38: ...ntenance of SENATOR systems is by functional testing logic diagnosis ASU changeout or system replacement NOTE The mains power supply to the Senator System must be switched off before the Power Unit or an ASU is removed or replaced The exchange lines test normal DEL conditions but will test low loop if a megger test is used When testing within the system from a SENATOR telephone towards the CCV bot...

Page 39: ...to Tum off the mains power for 5 to 6 seconds When power is restored reprogram the required facilities Retest the facility ies Many maintenance visits may be avoided by adopting this procedure A description of the facilities is given elsewhere in this book and instruction handbooks as described above are supplied for the customer s use The faulting flow chart Fig 7 1 will cover most anticipated fa...

Page 40: ...Cables Plugged 1n Mains fail Relays Released NO NO Check Exchange Lines E r timsion Cabling Check All fatensions Plugged in Is Fault RTNR No hold on recall No rec Earth NO YES Turn of f Power Check all AS U Plugged in Restore Power Fig 7 1 FAULTING FLOW CHART Change Complete System YES Clear or Change unit as necessary 7 5 ...

Page 41: ...or ASU the power supply must be switched off Precautions must be taken to prevent damage to an ASU by electrostatic discharge The three types of ASUs are not interchangeable and the backplane sockets are offset to prevent them being plugged into the wrong position Early versions of the ASUs had grey handles but later versions have colour coded handles as follows Extension ASU Modified Extension AS...

Page 42: ...be attached to every unit and completed in full Correctly completed fault labels will help to identify quickly any weakness in design or production If large numbers of items are returned for repair but faults are not apparent when they are tested then analysis of the fault labels may lead to design faults being detected Systems replacement should be regarded as the last resort It is not forseen th...

Page 43: ...Part 7 MAINTENANCE 7 8 CPE MS 526 Issue 2 12 88 ...

Page 44: ...r at each telephone this power being fed to the telephone over the data pair Power for the speech circuit and keypad at each telephone on intercom calls this power being fed to the telephone over the speech pair The power feed at each telephone contains a diode to protect the microprocessor circuitry against damage in the event of a reversal of the data pair However under these circumstances a com...

Page 45: ...Part 8 HOW IT WORKS 8 2 CPE MS 526 Issue 2 12 88 ...

Page 46: ...e Senator Power Module 37 4220 D141065A Extension Line ASU Senator ASU DPA 1209A 37 4221 LD Intercom ASU Senator ASU DPA 1210A 37 4222 M F Intercom ASU Senator ASU DPA 1217A 37 4223 Exchange Line ASU Senator ASU DPA 1207A 37 4224 5 lines External Extension Senator Adaptor SA 10253 410972 Adaptor LJUBell Adaptor ExtensionBell Adaptor 870216 ExtensionBell Adaptor Senator Adaptor SA 10255 410974 IP B...

Page 47: ...9 2 Part 9 PARTS LIST OF CURRENT EQUIPMENT FOR SENATOR CPE MS 526 Issue 2 12 88 ...

Page 48: ...5 Transfer 10 14 10 2 6 Intercom calls 10 14 10 2 7 Divert 10 14 10 2 8 Maintenance 10 14 10 3 INTER PBX CIRCUITS 10 15 10 3 1 Provision of inter PBX circuits using the adaptor 10 15 10 3 2 Installation of inter PBX adaptor 10 18 10 3 3 Facilities and operating procedures 10 18 10 3 4 Incoming exchange line calls 10 18 10 3 5 Intercom calls 10 18 10 3 6 The timeout period 10 18 10 3 7 Cleardown be...

Page 49: ...Part 10 AUXILIARY EQUIPMENT 10 2 CPE MS 526 Issue 2 12 88 ...

Page 50: ...e Fixing Holes Fig 10 1 EXTENSION BELL ADAPTOR SA 10255 Mains Connection Strip Fixing Hole Fuse When an Adaptor is fitted to an extension all incoming calls to that telephone will be signalled by the tone caller in the telephone as well as by the extension bell Two types of Extension Bell Adaptor can be used on the Senator 1 Extension Bell Adaptor SA10255 or 2 LJU Bell Adaptor The LJU Bell Adaptor...

Page 51: ... the telephone socket as convenient see wiring diagram overleaf NOTE If the extension telephone has a 4 wire line cord this should be changed to a 6 wire type Cord Conn 6 500 Inside the telephone SWl must be disconnected The switch which is a safety pin type as shown in the illustrations below is located on the underside of the printed circuit board module which supports the facility buttons Take ...

Page 52: ... ONE High lmpedence Extension Bell or tone caller may be fitted 4 Extension bell may be connected at Bell Adaptor or at telephone socket 5 Labelling of terminals on Extension Bell Adaptor was dif1erent on early models All models should be connected as shown w rn B A x T N x N CABLE EOUIPT 2503F s31 Na BELL EXTENSION BELL ADAPTER SA 10255 NOTE 5 4 A C 0 BELL I L I I J 240v FUSED 3 amp a c G Y EXTEN...

Page 53: ...ery to the wires fitted above as follows ve to JL6 ve to JlA When the battery is connected the relay in the unit should be heard to operate and the bell should ring to the 60v 25 Hz output All faulty units should be returned to the District store in the packing of the replacement unit and should have a fault label A8807A attached giving the details of the fault The LJU Bell Adaptor is fitted in pl...

Page 54: ...T QC N 0 0 G I I Senator Terminal Boar d DPA 1374 I rn T 0 N Q 0 47V 0 liJ T c O N Q O E x T N w T 0 N 0 o T J 0 N E 0 0 T J 0 N Q E s 0 rn T N 5 rn T N l C Q rn T N I Line Jack Unit 0 Extension Bell c Adaptor Item Code 870216 Cable Equipment 2503F c 0 t l m 0 c C 0 t l s m z r io ...

Page 55: ... to conventional d c and 25 Hz signalling over the speech pair to the telephone and vice versa An External Extension Adaptor allows approved standard telephones and other equipment which do not use digital signalling to be connected ID a Senator system An illuminated press switch which controls the ringing of the bell in the telephone at the extension is mounted in one comer of the unit as shown i...

Page 56: ...ly approved telephones detailed in lists 1 2 9 and 10 of the Department of Trade and Industry Telephone lists can be used The External Extension Adaptor is loop disconnect only It is therefore recommended that dual signalling telephones are installed These must be set on installation for loop disconnect signalling Extension bells may be fitted at an external extension in the same way as normal exc...

Page 57: ...ions mounted on the bottom left hand comer of the Line Termination Board see Fig 2 5 on page 2 8 The W G wire in the 6 wire cable should be terminated on the topmost available connector of the strip No connection to the earth in the CCU is required A safety pin type link SW2 if fitted on the PCB of the Adaptor close to where the wires to the illuminated pressswitch are terminated This switch must ...

Page 58: ... 0 L OJ I o N o E o 4 0 TTI I o N o E o 5 0 J o T o o N o 5 0 DJ O T o o N o 3 0 x 0 0 E o T o N o 1 Q Q l 1 EXTERNAL EXTENSION ADAPTOR SA 10253 A B C D 1 2 47 t 2503F I I Notes 1 Extension Numbers arc NOT significant 2 A maximum of 4 external extensions may be provided 3 SW2 in the adaptor SA 10253 must be closed Cable Dropwire or Suitable 2W Cable 12l a 0 3 _4 T LJU 11A I A C Q 0 c x c IJ m 0 c ...

Page 59: ...l 3 er w 8 0 UN I 3 z w 3 I _J CD 5 0 w a 0 3 I 3 CD N I I ai M 8 s M c QJ E a M C J OJ LL oo Otn UN v 3 I 0 Vi er 3 c 0 N ll 3 0 3 I I 3 CD I I 3 0 I 0 1 l0 t a i u o w x t z LL c t oO I I a z w u a Ul u I 3 00 I _ Fig 10 7 MODIFICATION TO SENATOR EXTERNAL EXTENSION ADAPTOR WHEN USED WITH SSAClSC SIGNALLING CONVERTERS CPE MS 526 Issue 2 12 88 ...

Page 60: ...l sound at the extension for incoming exchange line calls the extension user must lift the handset and dial 41 on his own extension The bell may be turned off by lifting the handset and dialling 40 In both cases the handset must be replaced before making any other calls Either of the two methods may be used to switch the bell on or off Calls may be answered by lifting the handset Outgoing exchange...

Page 61: ...l the call will be automatically transferred by the transferring extension replacing the handset An exchange line call which has previously been transferred to the external extension from another extension cannot be transferred again and enquiry calls cannot be made The HOLD and TRANSFER facilities are not available when the Senator is connected to a PBX which uses earth loop recall Calls to other...

Page 62: ...SA10254 terminated on an even numbered extension circuit is used as an interface between the CCU and the private circuit as shown in figure 10 8 The adaptor converts the digital signalling on the extension circuits data pair to E and M signalling SSDCS The SSDC5 signalling may be sent directly to line but it is more usually converted to SSACl S or SSDClO using signalling units 44B and 45A respecti...

Page 63: ...Fixing Hole I lb Fixing Hole 10 16 Part 10 AUXIUARY EQUIPMENT Remote Answering Lamp IDT Strips NOTE Top PCB is not shown for clarity Fig 10 9 INTER PBX ADAPTOR CPE MS 526 Issue 2 12 88 ...

Page 64: ...ere no earth exists at other signalling unit or circuit termination provide earth using 0 5mm bunched pair or extend to adaptor from CCU using G W wire 4 If the Senator has a terminal Board DPA 1211A fitted it will be necessary to reverse the A and B wires CABLE EOUtPT 2503F INTER PBX ADAPTOR SA 10254 A 8 C D WB IBW IW OIOW PBX MME E I B I ollo 9 I I I I I I I T l__l_ I l NOTE 2 3 1 0 1 I I 1 1 I ...

Page 65: ... exchange line calls will then no longer be extended Subsequent operations of the switch will alternatively switch the facility on and off Exchange line calls which are extended from the Inter PBX adaptor will only be answered at the PBX if it is configured to respond to the calling signal for example by an operator Senator extensions call the PBX in the same way as they call other extensions by k...

Page 66: ... One must also be careful when the PBX is generating engaged tone etc Once the adaptor has answered the calling extension s original intercom call it is possible to autotransfer an exchange line If it is autotransferred into PBX engaged tone etc then the PBX may never generate a CSA signal hence the need for the timeout period If an IPBX adaptor has decided that it is being called on both intercom...

Page 67: ...onverted to SSACIS using signalling units 44B A block diagram is shown in figure 10 11 below SSDC5 GENERATOR OR RELAY SET SSDC10 IAl SA 10200 OR LOOP SSDC5 SIG UNIT AC15 448 IF REQUIRED Fig 10 11 PROVISION OF INTER PBX CIRCUITS IN PLACE IN EXCHANGE LINES The following diagram shows an alternative method of providing an Inter PBX circuit in place of an exchange line The signalling unit 53A is conne...

Page 68: ... MS 526 Issue 2 12 88 Part 11 DOCUMENTATION The documentation published for the Senator is Senator User Guide CPE MS 525 Senator System Manual CPE MS 526 LJU Bell Adaptor Installation Notes CPE MS 372 11 l ...

Page 69: ...Part 11 DOCUMENTATION 11 2 CPE MS 526 Issue 2 12 88 ...

Page 70: ...220 mm Height 275 mm 11 5 kg Temperature o to 50 centigrade Extension line limit for dedicated terminals 250 ohms Extension line limit for external extensions 1250 ohms via External Extension Adaptor 250 ohms is equivalent to 1 5 km of 0 5 mm copper cable SSDC5 limit for Inter PBX AdaplOr 25 ohms These limits are not in addition to the normal exchange line limit of 1250 ohms The total loop resista...

Page 71: ...Part 12 SPECIFICATION 12 2 CPE MS 526 Issue 2 12 88 ...

Page 72: ...Part 12 SPECIFICATION 12 3 CPE MS 526 Issue 2 12 88 ...

Page 73: ...Part 12 SPECIFICATION 12 4 CPE MS 526 Issue 2 12 88 ...

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