Mitel SX-50 Integrated Communications System uses an innovative, compact modular design, which allows easy system expansion, faultfinding and card replacement.  Mitel's SX-50 is a digital electronic system, using stored program control and advanced digital architecture.  With a wide range of features, the SX-50 is a favorite within the hotel industry with its enhanced hospitality software.

• 160 Port Working
• SX50 can support full 160 port working.
• Up to a maximum of 32 Exchange Lines or 160 extensions.
• The 225W Power Supply Unit MUST be installed on systems with more than 80 extensions.

SYSTEM CAPACITY: SX50 can accommodate up to 10 Peripheral Cards. These cards can work in almost any combination, so that the required customer con ­ figuration can be achieved. There are several circuit card limits which MUST NOT be exceeded. Depending on the Power Supply Unit fitted, these maxima are:

• With the 140W Power Supply Unit, 24 Exchange Lines, 8 Private Circuits, 80 extensions, (or 32 SUPERSET 4s and 16 extensions).

• With the 225W Power Supply Unit, 32 Exchange Lines, 24 Private Circuits, 160 extensions, 32 SUPERSETS. The installer can configure the SX50 in any way he chooses but MUST NOT exceed the circuit card limits. The choice of circuit cards MUST be made carefully, so that there are no more than 10 cards and that the limits are not exceeded.

Circuit Cards - Up to 10 Peripheral Cards can be installed, but the following numbers of individual circuit cards must not be exceeded when using the 140W Power Supply Unit, NOT MORE THAN:

• (5) ONS (Extension) Cards
• (4) COV (SUPERSET) Cards
• (3) (8  circuit) Trunk Cards
• (6) (4circuit) Trunk Cards
• (4) Universal Cards
• (1) Digital Network Card, (NOTE: This card uses two card slots)
• (8) SSDC5 and SSAC1SA modules
• (1) Music on Hold/Pager/MF4 module.
• (1) RMATS module can be installed.

Control Card - The Control Card MK3 is situated at the back of the Card frame, parallel to the wall, and plugs directly into the Power Supply Unit. The Control Card carries:

• Connectors for up to ten Peripheral Cards.
• The Central Processing Unit.
• Digital cross point switches.
• Call processing circuits.
• Timing and synchronisation circuits.
• MF4 circuits.
• Music on Hold/Paging circuits.
• Music on Hold/Paging Terminal Strip.
• Console jack.
• RS-232 port.
• A seven segment LED display.
• Four Status switches.
• One Reset switch.
• Night Bell Terminal Strip.
• Voltage Test Points.

Peripheral Cards - Five types of Peripheral Card (Extension, SUPERSET, Trunk, Digital Network Card and Universal Card) are used in SX50. These are available in the following versions:

• Universal Card
• 16 circuit ONS (Extension) Card
• 8 circuit ONS (Extension) Card
• 8 circuit COV (SUPERSET) Card
• 8 circuit Trunk Card with 50 Hz Meter Pulse Detectors
• 4 circuit Trunk Card with 50 Hz Meter Pulse Detectors
• Digital Network Card

The Universal Card - is designed for a variety of peripheral functions and is configured by attaching removable modules. Up to four single-sized modules or two double-sized modules can be plugged in to each Universal Card. The modules use two connectors per single module or three connectors per double module. A group of four red LEDs on the front of the Universal Card indicate the status of the modules and a single green LED indicates the status of the card. There is a connector at the front for the cable to the Test Jack Frame. Three types of plug-in module are available for different configurations of the Universal Card. These are:

• SSAC15A Module. This is a single sized module. Each module provides the circuits for. one SSAC1S Private Circuit
• SSDC5 Module. This is a double sized module carrying the circuits for one SSDC5 E&M Private Circuit.
• RMATS Module. This single sized module allows data entry and fault location to be carried out from a remote Maintenance Centre.

**Note: We sell CARDS, PHONES, and PARTS for your existing Mitel PBX - We do NOT sell complete Mitel systems.