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TC12 General Handbook

666/HB/43100/000 Page 4-1 Issue 9

4. SYSTEM HARDWARE

4.1 General

The TC12 system comprises of the following equipment :

UTC Traffic Control Computer (TCC) - see 4.2.

Instation - see 4.3.

Outstation

Instation Test Set

Outstation Test Set.

See Figure 1 for an overview of the TC12 System.

4.2 UTC Traffic Control Computer System

The UTC Traffic Control Computer is either a VAX of Alpha system containing a minimum of one

computer. The TCC communicates with the instation PC(s) via an ethernet link. Individual

computers within the TCC communicate with each other via an ethernet link.

4.3 Instation

4.3.1.1 General

The Instation comprises of a cabinet containing a single communications PC and one or more

racks of equipment. The instation cabinet is 32U high with grey panelling and a smoked glass front

door.

The instation cabinet is fitted with the PC at the top, with space for up to four racks below it.

If the PC does not house an integral RS232 serial fan-out card, the rack immediately below the PC

will be fitted with a 16-way RS232 serial fan-out unit, otherwise this rack will be either an Instation

Transmission Unit (ITU) rack or a Digital Output rack. The racks below the top rack will be either

ITU or Digital Output racks, but the bottom rack can be used for an OTU if required.

There is also a mains distribution system with spare sockets, and facility for mounting a PSTN

modem which would connect to the TCC to allow remote interrogation.

See Figure 2.

4.3.1.2 System Fault Indication Panel

The System Fault Indication Panel (SIP) is positioned in front of the PC and houses LEDs to warn

of various failures. There is also an audible alarm on the SIP which can be cancelled by a switch

next to it or disabled by a switch on the PSU board.

4.3.1.3 ITU Rack

A fully equipped ITU rack contains three types of board consisting of four modem boards, four

transformer boards and a PSU board.

The modem board has four modem chips or a DSP chip on a daugher board which communicate

with the PC via an RS232 link. These modems are connected to the OTU via the telephone lines in

either radial, multidrop or multipoint format - see 5.1.3. There is also a pair of test jacks on the

modem board to allow connection to the instation test set to monitor communications data and

measure signal levels.

To connect the OTU in radial format a Radial Modem assembly is required. This comprises of the

standard Modem PCB plus a Transformer PCB.

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