MITEL SX10 & SX10E
|PXML No. 75 (SX10) and 79 (SX10E)
APPROVAL No. NS/1412/23/E/022682 (SX10) and NS/1412/23/E/022919 (SX10E)
Click here to see information on BT's withdrawal of Subscribers Private Metering (SPM)
The Mitel SX10 (shown below with console) and SX10E (shown right with superset 4) is a LD/MF analogue switch with a maximum configuration of 8+24 (SX10) and 8+32 or 8+24 (SX10E). The SX10 was introduced around 1982, used a Remote Display Unit instead of a console (introduced late 1983) and had a metal cover surrounding the PSU and card mounting. The SX10E superseded the SX10 in 1985, and was fitted with a plastic, ribbed cover and used software variant 143, which supported supersets (up to 24), call logging and 60 memory abbreviated dialling. Both variants have 8 speech paths and system architecture is Stored Programme Control (SPC).
Made by Mitel, the equipment was sold by a number of companies under different names. The SX10 and SX10E were wall mounted and used the SX20 console or a small LCD display for indication purposes.
The main cabinet contains:-
A Mastercard II which carries SLICs for 8 extensions, tone generators and receivers and the Firmware Module.
It may also include 1 or 2 Trunk Modules (2 trunks each) and a Communicator Module which allows SS4 Feature phones to be connected to this card.
A System Expander Card which carries SLICs for either 8, 16 or 24 further extensions, tone receivers and optionally, 2 more Trunk Modules can also be installed in the system.
Trunk Module's may be standard loop disconnect modules (switchable for Loop or Earth calling) or SSAC15a modules or SSDC5 (E & M) modules.
The system may also include a Remote Call Status Display. The SX10E can handle a maximum of eight simultaneous calls.
The maximum capacity of the system is:-
8 Trunks and 32 Extensions of which up to 8 may be SS4 Feature phones (143 variant only).
The British Telecom version of the SX10/SX10E had a wall mounted PSU and MDF. The equipment cards were housed in a black console (similar design to a Monarch console). This system was called the Viceroy/Super 10 and had a restricted capacity of 8+16.
The PSU and card frame are separate, but are both mounted on the same wall plate. An
integral battery may be fitted within the PSU and this will maintain the system power for
up to 45 minutes. The card frame accepts two cards and each card will support 4 trunks (2
x 2 cct) each.
After a mains failure and exhaustion of the battery back-up power the first two extension equipment numbers are connected to the public network.
A 27V dc feed is supplied to extension telephone instruments.
REMOTE DISPLAY UNIT
Loading Default data
DIP switch settings
Printer Lead Wiring
Voltage Test Points
There is a strip of pins located near the DIP switches. System voltages can be tested at this point with a high impedance multimeter.
Pin 1 is the top pin and pin 6 is the bottom pin.
PARTS Description Manu No BT Part No HANDSET AND CORD (HANDSET 16B BLACK) 9102-046-001-NA 374480 EXPANDER CARD 16 CCT 9100-021-021-NA PROM GEN 142 - SX10 9100-026-142-NA PROM GEN 143 - SX10E 9100-026-143-NA BATT PACK (FITS IN PSU) 9100-003-000-NA 374488 EXPANDER CARD 24CCT 9100-021-031-NA POWER SUPPLY UNIT - SX10 POWER SUPPLY UNIT - SX10E 9100-002-013-NA cabinet SX10 CABINET SX10E (RIBBED PLASTIC COVER) 9100-023-000-NA EXPANDER CARD 8 CCT 9100-021-005-NA EXPANDER CARD 24 CCT 9100-021-031-NA REMOTE DISPLAY UNIT 9100-022-010-NA CABLE SET 9100-025-005-NA MASTER CARD II - SX10E 9100-001-013-NA REMOTE DISPLAY KIT (WIRING SET) 9102-041-000-NA TRUNK MODULE EXCH LINE 2 CCT 9102-011-044-NA 374481 TRUNK MODULE E+M 2 CCT (DC5) 9102-011-011-NA 374491 TRUNK MODULE AC15 2 CCT 9102-011-021-NA 374492 CONSOLE fuw SX20 AND SX10 9102-018-005-BA 374600 Operators console cable Superset 4 9174-000-012-BA Featurephone TX14 (BT VERSION OF SUPERSET 4) 9174-000-039-BT MPD Unit for 4 cards MPD card (12 trunk) 8170-000-000-BA RAM batteries Description & source 142 ALARMS 01 Power up diagnostics test. 02 Power up or auto diagnostics test. 04 Automatic diagnostics test. 05 Automatic diagnostics test. 10 TK condition. (No loop curr. detected on TKxx) 11 TK condition. (No seize ACK. when TKxx seized). 12 TK condition. (No Release ACK. when TKxx Rlsd). 20 Sp/path stuck at 0 and busied out 21 Sp/path stuck at high and busied out. 22 Sp/path xx 5/cct. to Sp/path yy both busied 23 Sp/path xx failure due to DT detector test. 30 Unable to connect Sp/path to Extension xx. 31 Unable to connect Sp/path to TK xx. 40 DT detector x failure and busied out. 4I MF4 gen. x failure and busied out. 42 MF4 rec. x failure and busied. 50 P/fail & reset caused by internal working. 60-69 Software alarms. 63 Defective battery ram. 64 Corrupted non-volatile ram. 80 Trunk held up busy. TO LOAD DEFAULT FROM CONSOLE 1. Access programming mode. Press and release status button until software variant shows, then hold button down 2. Type in password, release status button and then type 58 or # (depends if lastno redial set, 143 or 243 only) 3. ?601 shows on display (This is programming mode) 4. Key #998* Default data is loaded when display flashes TO LOAD DEFAULT ON INITIAL POWER-UP 1. Turn power on 2. Set system status switch 1 to closed 3. Press reset button, Console display shows 8888888, then flashes ??????? 4. Within 6 seconds set SW1 to OPEN Console shows ------- 5. Set SW1 to CLOSED Console shows 00-00 6. Default data is now loaded EXTENSION DIAL-UP CODES (default) 68 Paging access 67 Hold 690 Hold Retrieve-Local 691 Hold Retrieve-Remote 66 Group Pick-up 61 Diversion of all calls 8 Night Service dial answer 62 Diversion on no reply 63 Diversion on Busy 65 Extension reset 9 Trunk access SX10 142 OPERATORS DIAL-UP FUNCTIONS 11 Night service ON 12 Night service OFF 13 Identifying & resetting alarms 14 Set l2hr clock 15 Set 24hr clock 16 Lamp test (cabinet and remote display only) 19 +xx access TK by equipment number 21 +TK No. +Extension Night service 22 Temp TK barring +Extension. No 23 Barring Extension to Extension. ON 24 Barring Extension to Extension. OFF 27 +xx Access Sp/path by number 3I Alarm clear 32 Cancel all alarms 4I +xx Busy out trunk 42 +x Busy out MF4 Generator 43 +x Busy out MF4 Receiver 44 +x Busy out DT detector No x 45 +x Busy out Sp/path 51 +xx Free Trunk 52 +x Free MF4 Generator 53 +x Free MF4 Receiver 54 +x Free DT detector 55 +xx Free Sp/path SX10E 143 OPERATORS DIAL UP CODES (142 plus those below) 17 Background music ON 18 Background music OFF 28 Display message waiting 29 Clear messages waiting 60 Review ABB dial 65 Set ABB dial 71 Set Auto-wake up 72 Display auto-wake up 73 Extension metering audit 75 * Printer suspend 75 0 Printer purge 75 # Printer resume 80 Set date 97 Data dump 98 Data load KNOWN PROBLEMS 1. Flat RAM battery. Causes strange problems - usually after a power cut. Corrupts system memory, causes near stoppage - but not quite! Can be confusing and may look like a CPU failure. Check battery voltages and replace - it is recommended that batteries be changed every 4 years. Ensure that database is fully documented. 2. Console handset cuts off calls. Old style consoles were prone to the handset sockets breaking - test by wriggling plug. Also handset cord fails where it meets the handset. 3. Console goes into night service automatically. Usually caused by console handset cord failure.
4. Console goes dead. Switchboard cable is not fixed with a cable strap. There is a fixing point available and if this is not used then the cable Connector tends to disconnect at one end.
Last revised: April 29, 2023