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TC12 General Handbook

666/HB/43100/000 Page 5-11 Issue 9

5.2 Instation Facilities

See

Figure 9 for a diagram of the Instation system.

5.2.1 The System Fault Indication Panel

The system indicates a PC failure, a System failure, UTC TCC failure and Operation failure by

lighting the appropriate LED on the SIP. There is an audio alarm on the SIP which can be

configured to sound on any of these failures. The audio can be cancelled by a switch on the SIP or

from a keyboard connected to the UTC TCC, or disabled by a switch on the PSU board. Any of

these fault conditions will disable communications on the modem PCBs. The alarm volume may be

changed by setting a potentiometer on the PSU board.

5.2.2 Modem fault indication

LEDs are mounted on the modem PCBs to indicate power, watchdog failure, transmit data

presence and receive data presence.

5.2.3 Fault Actions

There is a hardware watchdog to ensure that the hardware is reset should the PC software fail.

Should the software fail, the watchdog will reset all modems and set them to continuously transmit

constant carrier.

The ITU will also automatically recover from:

Line Loss

Board Removal and Replacement

OTU Failure

Power Loss

5.2.4 PSTN Modem

There is an option for a PSTN modem to be included in the Instation Cabinet to allow remote

interrogation of the Traffic Control Computer (TCC).

5.2.5 TC8 Integration

There is provision for connecting the TC12 instation to a TC8 instation, in which case the TC12

TCC would drive both the TC12 and TC8 instations. This is to allow an existing TC8 system to be

upgraded by the addition of TC12 equipment.

5.2.6 Digital Output Facilities

A digital output rack can drive up to 1024 lamps on a wallmap, powered either by supplies in the

bottom of the cabinet or local to the wall map. The rack can be of two types, current source or

current sink, depending on whether the common terminal for the wallmap lamps is positive or

negative. Current limiting resistors of any value can be included in the rack although the standard

is 15mA. The rack can supply up to 25mA per lamp at 30V.

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Siemens TC12 Guía de usuario Pagina 31