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TC12 General Handbook

666/HB/43100/000 Page 2-3 Issue 9

2.7 General Overview

TC12 is a telecommunications system designed for Urban Traffic Control (UTC).

It consists of a number of Outstation Transmission Units (OTUs) positioned in traffic controller or

detector cabinets. The OTUs communicate with a Central Office containing one or more Instations.

Communication between the OTU and an Instation is by means of a) telephone (normally leased)

lines, which can be operated at different baud rates and signal levels or b) RS232 serial links which

can be operated at the same baud rates as the telephone lines.

The Instation periodically sends a Control message to the OTU which will cause the OTU to form

the appropriate Reply message which it will send back. These messages are of configurable size

depending on the amount of data transfer needed.

The Instation connects via an ethernet link to a Traffic Control Computer (TCC) system consisting

of one or more computers. This system drives the Instation modems, which communicate with the

OTU via the telephone lines. The modems are not provided where RS232 serial links are required.

The Instation also drives the System Fault Indication Panel (SIP) which indicates, by means of

LEDs and an audible alarm, failures in the TCC. The SIP is housed in the Instation cabinet but

there is also the option of driving a remote SIP. The TC12 Instation can also be used to drive a

TC8 instation.

There is also facility for an Instation Test Set which can be used to measure signal levels and

monitor communications (both data and errors) on the telephone lines. It can also be used to take

the place of either Instation or Outstation for testing.

The Outstation test set is used in place of the controller to both set Reply bits and monitor Control

bits at the OTU.

See Figure 1 for a TC12 system overview.

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