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)
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 The SX10E superseded the SX10 in 1985, and was fitted with a plastic, ribbed cover and used software variant 143, which supported supersets (up to 24), call logging and 60 memory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.
240V 50Hz mains voltage is converted in the power supply unit to the voltages required by
the system. In the event of a mains failure the SX10E has a 90 minute back-up battery.
System configuration is maintained, in the event of a complete power failure by the use of
battery supported RAM. The PSU is rated at 60 watts and weighs 20 lbs.
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.
CONFIGURATION
The system cabinet fixes to the wall and uses a separate console that can be positioned
away from the cabinet. This console is also used by the Mitel SX20. The Master Card (CPU
board) has 8 extension ports and provision for 2 trunk cards. Additional ports are added
by installing a 8, 16 or 24 port extension cards. These cards have provision for 2 trunk
or 2 private circuit cards. A Remote Display Unit must be fitted for programming purposes,
if no console is provided. Featurephones can only be used on 143 variants with Mastercard
2.
REMOTE DISPLAY UNIT
The Remote Display Unit is supplied as a kit that comprises of two American
style jacks and two connection cords. A two pair cable is run between the
two jack sockets. On cord plugs into the Remote Display Unit and the other
end plugs into the CCU motherboard. The Display Unit is shown to the right
and the table below advises on how to wire the unit.
| Socket for Cord to CCU | 2 Pair cable | Socket for Cord to Display Unit |
| Yellow | White/Blue | Black |
| Black | Blue/White | Yellow |
| Red | White/Orange | Green |
| Green | Orange/White | Red |
INSTALLATION
Before use, the SX10 system must be loaded with default data. This operation clears out the RAM and loads default data,
ensuring that the database is free from corruption.
Loading Default data
DIP switch settings
| ON | Always On | 2 digit extn range |
Port 1 normal extn |
Data access protected |
| 4 | 3 | 2 | 1 | |
| OFF | 3 digit extn range |
Port 1 test extn |
Data access unprotected |
Programming Mode
To enter programming:
Printer Lead Wiring
| RS232 socket | Printer plug | |
| 2 | ------- | 2 |
| 3 | ------- | 3 |
| 7 | ------- | 7 |
| 6 wired to 20 |
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.
|
Voltage to be measured |
Measurement point |
Reference point |
Voltage range |
| +5v dc | Pin 1 | Pin 5 or 6 | +4.8v to +5.2v |
| +5v dc | Pin 2 | Pin 5 or 6 | +4.8v to +5.2v |
| -8v dc | Pin 3 | Pin 5 or 6 | -7.6v to -8.2v |
| -28v dc | Pin 4 | Pin 5 or 6 | 27v to 29v |
| 0v dc | Pin 5 | Reference | |
| Ground | Pin 6 | Reference |
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.
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