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GENERAL
The OS304M is a 4-channel 64kbps audio drop-and-insert multiplexer. The OS304M forms part of a telecommunication system operating in a ring network. The ring is controlled from a master unit -named the OS2030. The OS2030 is designed to transmit a 2 Mbps CCITT G703 data link over fibre. This unit interfaces between G704 CAS protocol and several OS304MUX units. The OS304MUX unit can then drive a number of different interface modules that are simply plugged into the unit, and set up accordingly via a management software solution.
The OS304M can also operate in a Master mode, allowing a point-to-point operation with another OS304M, or a simpler ring network consisting of only OS304M muxes.
The unit has a built-in 4 port bus system which can house any combination of line terminating equipment modules. At present only the following is available :-
Exchange Module - stock code ?OS301E?.
This interfaces directly with an exchange line, or PABX line, and simulates the functions of a telephone.
Telephone Module - stock code ?OS301T?.
This unit can couple directly to a telephone instrument and simulates the functions of an exchange.
4W Audio E & M Module - stock code ?OS301W?.
This is a 2-wire or 4-wire audio interface with E & M signalling.
AiPhone Module - stock code ?OS301AM? (Master) and ?OS301AS? (Slave).
This is an AiPhone Intercom System interface module.
The OS304M can be configured by software to accept any of the above line terminating modules.
To configure the OS304M, a PC with dedicated management software is required. The configuration can be downloaded directly into the unit by using it?s internal RS232 port. Or it can be downloaded to the OS2030 master unit, that will in turn forward the configuration to the OS304M via the supervisory channel across the fibre link. New software can also be downloaded in this way, or can be installed using pre- programmed E?PROM?s which are available from the supplier.
The unit is modular in design and can thus be upgraded with different optics or power supply options. The distance over which the system can operate is determined by the fibre interface used. The options are limited to 3, 12, 18, 26, 36, 52 and 90 Kilometres. The power supply can be replaced by removing the power supply module and fitting the required module. Either 220VAC,110VAC, 48VDC or 12VDC. Other voltages can also be supplied on request.
The system uses the latest technology in line driving and decoding integrated circuits and therefore complies fully with the stringent CCITT standards. The unit comes in two options. The first is housed in a small metal enclosure compact enough to fit two next to each other in a 19? rack with a height of 2U. The second consists of a rack mount card that can plug directly into an OS800 3U 19? sub rack.
The unit has a built in framer. The framer will take the received data and re-time the data for transmission further down the line. Whenever a timeslot allocated to a particular outstation is reached, the time slot will be dropped off to the correct line interface and the interface data is then inserted in the frame.
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