IBM 1750


PXML No. 40
APPROVAL No. NS/1210/GF/1981/PR


The IBM 1750 is a stored program, microprocessor controlled PABX introduced in the late 1970's. The analogue switching network uses thyristor cross-points. The system can be expanded from a minimum of 100 extensions to a maximum of 760 extensions (96 exchange lines) in modular stages. In addition to supporting modular hardware expansions, the system software provides separate feature packages and function sets.

Network and call distribution facilities are also available.

50 volt power to the system is provided by either Rectifier's No. 152 or 153, with additional 24 volt supplied by Rectifier 151 or Harmer and Simmons TC1A. Later installations use a stand alone ELTEK Power Cabinet, which provides both voltages along with standby batteries.

The software is provided on 8 inch floppy discs, each having labels showing their software identification and release level. The discs contain the operational, utility, and maintenance diagnostic programs.

Made and installed by IBM UK Ltd.

MAINTAINER
BT is the approved maintainer for all systems and IBM UK Ltd are approved maintainers for liberalised system ONLY (those are systems brought into service after 1 July 1985).

APPROVAL STATUS
The system was fully approved in October 1981. The on site PXML should be applicable to that switch's modification/software level.

A list of approved software releases are contained in the latest PXML. The following software releases can be fitted to any site:-

                  RELEASE NO                EC NO
                      1.0                   098425
                      1.1                   098799
                      2.2                   378385
                      3.3                   873430
                      3.4                   A04481

To find out which software/EC/patches are fitted to site, sign on and load
Programme Al, then type in SHL or SSHL.

PARTS
PART NO                       DESCRIPTION
4178065                       DISK CARD
5619704                       DDA   2
5623352                       DDA   1
5654270                       NIF   2
5654506                       SW
5654640                       SIF   2
6122084                       CAC               IN POWER KIT
5654686/6122073               SOL
5654817                       CEPA
5654986                       SAC   I/0         IN POWER KIT
5654288                       SAC   CPL         IN POWER KIT
5655125                       RDC
5655133                       ROS   1
5655134                       ROS   2
5655135                       ROS   3
5806560                       NM 1
5806572                       MKD CARD
5806573                       LI 2
5806577                       SDT CARD
5806583                       STP
5806590                       PTD
5806599                       OID
5860433                       DXP
5861249                       NM 12
5861252                       MKC
5862979                       NM 9
5863162                       AUR
5864611                       CL 3
5864612                       CL 4
5864613                       XPC   2
5864614                       OCD
5864617                       MPW   2
5864626                       RTD
6121905                       DVR
6121922                       DVR
8523016                       CCA   1
8523023                       EIA
8526485                       CCA
8562441                       MP
8562442                       I/0
8562443                       SIF   1
8562444                       PSW
8562445                       DT
8562446                       SCA   1
8562459                       RCV   1
8563145                       ISOL
8563147                       RCV 2
8563156                       RCV 3
8565601                       NIF   1
8565615                       CA
8565624                       SCA   2
2402024                       STORAGE
8254822                       CLOCK
1730923                       SCAN
1776501                       ITF
8254819                       REG
8258430                       ASL              IN POWER KIT
6122073                       SOL              (WITH NEW EC)
5806571                       DRIVER
5654850                       ROS 1 OLD EC LEVEL
5654851                       ROS 2 OLD EC LEVEL
5654852                       ROS 3 OLD EC LEVEL
8562449                       SIF 2 OLD EC LEVEL
5654317		              CABLE                  
8277800		              DC PWR OP
5654318		              CABLE
1732321		              OTS
5654319		              CABLE
1732616		              LEDDIS OP
5654320		              CABLE
1732872		              1755 PWR
5654322		              CABLE
2305616		              BELT
5654323		              CABLE
2426124		              RELAY
5654324		              CABLE
2462606		              STEPPER M
5654325		              CABLE
4178035		              HEAD ASM
5654326		              CABLE
4178047		              SOLENOID A/EC
5654327		              CABLE
4178057		              DRIVE MOT
5800926		              CABLE
4178065		              DISK CARD
5800930       		      CABLE
5562044		              BAND
5800933		              CABLE
5562081		              LES ASM
5802237		              CABLE
5562083		              PHOTO TX ASM
5805467		              OLC IN OPE KIT
5623482		              STO
5808469		              OAW IN OPE KIT
5654298		              CABLE
5862985		              ODG IN OPE KIT
5654299		              CABLE
5863100		              ODD IN OPE KIT
5654309		              CABLE
5863134		              OLT IN OPE KIT
5654310		              CABLE
5864614		              OCD
5654311		              CABLE
6121467       		      CE PANEL
5654314		              CABLE
8274600		              CPL BOARD
5654315		              CABLE
8274602		              I/0 BOARD
5654316		              CABLE
8563155		              CCTL OPE

Some cards have been superseded by later revision cards.  All cards of the
same description are compatible unless stated.  The on site documentation
(BLDS) also contain old/new level part numbers.
 PARTS
LIST
 
 
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