Tait T805, Руководство по обслуживанию

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M805-00
T805-04 Backplane 10.3
Copyright TEL 30/04/95
10.1 Introduction
The Tait Quasi-Synchronous system is a modular product and may be housed in either
one or more 6U high 483mm rack frames. A 1U high rack frame is also available for
remote sites and is covered in Section 11.
Each 6U frame has a backplane PCB and slots (or ports) for either an LEM, TSGM, AIM
or ARM. When the physical capacity of the rack has been exceeded, an additional rack
may be easily added until the required number of ASP cards is fitted. The system is
capable of operating 8 networks with either one or two TSGM cards per network. Up to
222 LEM ASP cards may be used per system. The number of AIMs and ARMs used is
dependent on the system organisation.
Each ASP card is located in the rack by a guide which mates the rear connectors of the
card and rack. The rack connector (a 32x2 DIN connector) supplies power to the card, as
well as the audio, control and communications signals.
10.2 T805-04 Backplane Function
The T805-04 backplane serves a number of functions in the T805 Quasi-Synchronous
system:
- to distribute power to the ASP cards;
- to provide a means of audio input and output from the ASP cards;
- to distribute this audio to other ASP cards and pass it on to other backplanes in
the T805 Quasi-Synchronous system (if required);
- to provide a means of control signal input to and output from the ASP cards;
- to distribute these control signals to other ASP cards and pass them on to other
backplanes in the T805 system (if required);
- to distribute the RS-485 communications to the ASP cards and pass them on to
other backplanes in its Group.