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TC12 General Handbook

666/HB/43100/000 Page 6-1 Issue 9

6. INTEGRAL OUTSTATION TRANSMISSION UNIT (OTU)

6.1 General Overview

This section describes the Integral OTU (Integral OTU). This is an additional PCB which can be

used in the TC12 System. It can be fitted to T400 or ST800 traffic controllers and used to

communicate with an Instation. In this respect the description of the relationship between OTUs

and Instation, given in the General Overview of section 2.7, is applicable. However, there are a

number of differences between the Integral OTU described in this section, and the Freestanding

OTU described in the rest of this document. The main difference is that the Integral OTU can only

be fitted in T400 or ST800 Traffic Controllers. The Freestanding OTU, on the other hand, can be

fitted to a variety of traffic controllers.

In more detail the differences between the Integral OTU and the Freestanding OTU are as follows;

the Integral OTU does not contain the 2 input/output connectors (used on the freestanding OTU to

connect to the controller and/or detector cards), instead it contains a connector which is attached

to the Extended System Bus Cable. All Information between the Controller and the Integral OTU is

exchanged over this extended system bus. Each Integral OTU can be configured with up to 3

Control and 14 Reply bytes, depending on the system configuration. The Integral OTU does not

contain a separate handset port but is configured using a handset attached to the Controller. The

Integral OTU can provide an LMU facility on the T400 only, and a connector allows current and

voltage monitoring transformers to be attached for this purpose. 23 analogue inputs for LMU

current sensors and 1 analogue input for a lamp supply voltage monitoring transformer.

There is a pair of test jacks on the board to allow connection to the instation test set to monitor

communications data and measure signal levels.

Further information on the Integral OTU is contained in the TC12 Installation Commissioning and

Maintenance Handbook.

6.2 Indicators

There are LEDs on the front of the Integral OTU to indicate:

Watchdog fail

Carrier detect

Transmit confirm

6.3 Fault Action

Should the processor fail for any reason, transmission is stopped. There is also an option, set by

fitting a diode on the PCB, to reset the processor under these circumstances.

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