Milestones

Made by MITEL the Entrepreneur is an analogue switch of maximum 4+10 capacity. Trunks are added in pairs. The system supports Pots (MF and LD) and Entrepreneur keyphones. The trunks and private wire cards are the same as the MITEL SX10/SX20 range.

The system is programmed from the first extension port, the telephone being a POT or Featurephone.

Earlier firmware did not support private wire trunks.

Entrepreneur Electronic Set (Loop Limit = 152m (500ft)
Standard LD (Rotary) or MF POT Telephones (Loop Limit 600 Ohms at 20mA)
Maximum of 2 Ringers per Extension
Ring Frequency – 25Hz
System Impedance – 600 Ohm
Primary Power – 220 Volt, 50HZ
Local Exchange Loop Limit – 1600 Ohm
Environmental Requirements – 0-40 Degrees Celsius
10-90% Relative Humidity (Non-Condensing)
Switching Unit Dimensions 256mm x 115mm x 73mm

Fifty percent of all businesses can be satisfied by a communications system that offers up to 6 extensions and two outside lines. The Mitel SX5 is that system.

After thorough research of this most cost-sensitive market, Mitel created the SX5. It combines maximum performance and economy in a compact, stylish package. For users as diverse as restaurants, garages, small professional offices, residences and many more, the SX5 is the complete communications system. Better dm competitive initial and ongoing costs ensure excellent economy with unsurpassed performance.

The SX5 uses standard DTMF and/or rotary dial telephones with 2 wire cabling. The SX5 features low power consumption, system battery backup. No special operating environment is required. Minimal programming allows quick and easy loading of location dependent information. Simple terminal strip connections and no hardware configuration reduction and maintenance time to just minutes. The same replaceable extension circuits and trunk modules as the SX10, Super 10 and SX20 provide inventory and training savings.

The SX5 has a wide range of features that control communication expenses and increase user efficiency. For instance, immediate response to incoming calls is guaranteed with the innovative Common Audible Ringing feature, which allows a number of extensions to answer simply by going off-hook. Flexible Toll Restriction controls long distance calling.

Powerful call handling features such as Transfer, Conference, Call Forwarding and Paging are available at every extension. Incoming callers think big business when they hear Music-on-Hold. Where desired, an extension can be given private line service, with no loss of, other features, using Direct-In-line. In addition, Tone to Pulse Conversion and much more are standard with every SX5.

SX-5 TECHNICAL SUMMARY

Technology: Stored Program, Microprocessor Controlled
Switching: Solid-State Space Division
System Capacity: 6 Extensions/2 Lines
Equipment Cabinet: 17″ (432mm)H x 11.5″ (292mm)W x 3″(76mm)D
Weight: 10lbs. (4.5 kg)
Primary Power:
100-132v ac, 47-63 Hz
0.8A maximum, 0.4A typical, 230V operation optional
Environment: 0-40’C (32-104’F)
10-90% Relative Humidity (Non-Condensing)

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.

First made by Mitel in 1985 this switch was originally called the SX500, with BT naming it the Dekara.  In 1986 the system was renamed as the Mitel SX50 and the BT TSX50.

The SX 50 is a micro processor controlled switching system that uses a digital switching matrix for the connection of calls. TSX 50 was released in 1987 with Generic 3543.02 (UK1) software. The introduction of Generic 3543.03 (UK2) software in May 1989 allows the use of a Visually Handicapped Operators Console (VHOC) attachment and, with a new power supply PSU2A increased system capacity from 80 to 160 ports.

System capacity will depend on the type of power supply unit (PSU 1A or PSU 2A) – see table below. Note that the quoted capacities cannot all be achieved at the same time, due to a limitation of 10 interface card slots per system.
Generic 3546.01 (UK3), released in June 1990, introduced Automatic Route Selection (ARS), Remote Access (RMATS), and other facility enhancements detailed in the system documentation. Increased capacity can only be offered when using Generic 3543.03 or 3546.01 software with the PSU 2A.

In 1994 DASS2 connectivity was announced and this used the Interconnect 200 box in conjunction with the SX50 DNC card (which supported DPNSS).  It is debatable whether BT sold any. The system could be fitted with Superset 4, Superset 400 type telephones or one switchboard.

The SX200 is 256 port Call Connect System (CCS), of which 184 ports are available for assignment to extensions, trunks and private circuits (the remainder are used for receivers, special functions and the common control). The systems capacity depends on how these ports are used, as an extension uses one port, a trunk uses two ports and a private circuit uses four ports. The maximum size of the system is actually 24+134.

Regent is an SPC switch utilising CMOS switching and a MC6800 CPU supported by 8k of RAM. The generic (system operating programme) is stored in 56K of programmable ROM and there is also 4K of battery backed up RAM that contains access code and extension information.
Speech is analogue using 31 speech paths connected to every port on the system.

The system is housed in a floor standing cabinet of size 960 mm high, 600 mm wide and 700 mm deep and weighing 132 kg when fully equipped.

Various generics are approved:-
Generic 245 (these had white consoles)
Generic 345 (SX200, non-BT supply only. Cannot support supersets/TX14).
Generic 247 (these had black consoles)
Generics 248/250 are approved (non BT).
The Customer database is held on battery backed RAM on the Integrated Processor Control Card.
G245 customers cannot change data base (thumbwheels inside cabinet) Other generics have default database and limited programming by customers.

Extension cards contain eight ports, trunk cards 4 ports and private circuit cards two ports. The system also supports TX14/Superset 4 featurephones that operate on special extension cards.
Introduced into the UK mid 1982 and initially available only in BT regions BTE, BTNW and the City of London. The SX200 is sold through a number of distribution routes in the U.K. and as a consequence may be badged as follows: Casstel, Royale, SX-200 & Regent.

The Mitel SX-2000 is a digital integrated communications Private Automatic Branch exchange (PABX) system. The SX-2000 is called an Integrated Communications System because it can switch telephone calls and data connections between terminals and / or computers. The capability to handle both voice and data is one reason why the SX-2000 is economical and flexible. Only one system is needed for both tasks, to connect a telephone and a terminal to the same line, allowing rapid office reorganisation without the need for rewiring.

The SX-2000 consists of the following subsystems and equipment:

• Fibre optic cable distributed equipment cabinets that house the central processor and common control elements of the system and circuit cards;
• The software that controls the system; An integral hard disc drive that stores the system software and the working copies of the system data;
• A cartridge tape that is used for loading and making backup copies of the system software and data, including optional software;
• One or more Superset operator consoles:- These can be screen based or LCD display consoles offering unrivalled facilities including a powerful programmable telephone directory. The console can be used to perform Moves and Changes;
• Extension telephones, both standard and the Superset family of digital telephones:- Whilst most approved telephone instruments can be connected to the system. Feature telephones not supplied by MITEL may not have access to all features and facilities. MITEL recommend that telephones that are not supplied by us are tested for use with the SX-2000 prior to purchase.
• Printer to provide the system manager with a record of system data, traffic information, including calls to and from individual extensions.
• Datasets to enable telephone users to make and receive data transmissions;
• Optional maintenance terminal and printer, which the maintenance engineer can use for fault diagnosis and reprogramming;
• System Fail Transfer circuits that ensure a telephone service to predetermined extensions in the event of a power supply failure (beyond the duration of the optional stand-by power equipment);
• A Test Jack Frame that provides a distribution point for the system wiring.

Introduced in 9183, the Mitel SX2000SG (SG = Single Group) is a dual processor digital PABX with provision for up to a maximum of 2500 extensions plus 625 trunks. This does not include the additional use of ports for data, Supersets etc. For maximum hardware and software configurations see SX2000. Consideration must also be given to traffic requirements when deciding on overall system configurations. Redundant processors are provided in Digital Service Unit areas, peripheral shelves and main control. Each cabinet has it’s own DC/DC converters requiring 50 volt DC input. These can be supplied from either AC rectifiers, also located in each cabinet or from an external DC supply, which may be provided from an approved power system such as a Power System 2008j. Superset 7 Used for operator consoles. Sometimes used as separate administration terminal or Message Centre.

DEC VT 102, 220 or 320 maintenance terminal, may also be used as an administration terminal.
DEC LA 50 or LA 75 Printer – minimum 2. Used for maintenance logs, screen printer and administration work including SMDR (Call Logging). Winchester disc units (one per CPU). Mass storage device used as a permanent store medium for system and customer data. Floppy disc unit. Used for data, program loading and customer data back up. Superset 4 (known as TX14 if BT provided). Special feature phones.

Imagination was actually designed by TSC, a company which Mitel later purchased.  The Imagination range is now discontinued.

There are two systems in the iMAGINATION range, the Mitel iMAGINATION Micro and the Mitel iMAGINATION Series.

SYSTEM FEATURES

Integrated Voice Mail, Automatic Attendant, Computer Telephony, DECT Office Mobility and Private Networking (DPNSS & AC15a) are all available. In addition the iMAGINATION’s ISDN Camera adds a unique and integrated security monitoring application that allows visual verification and recording of incidents on a user friendly Windows package.