Siemens TC12 Betriebsanweisung PDF herunterladen (Seite 15)

TC12 General Handbook

666/HB/43100/000 Page 4-2 Issue 9

The transformer board is used, when the system is in radial configuration, to split each modem to

up to 8 telephone lines. This gives a maximum of 128 telephone lines per rack.

The PSU board supplies power to the ITU rack. It also interfaces between the PC and the SIP and

allows connection to a TC8 ITU rack. This facility would be used should a TC8 system be

expanded with TC12.

See Figure 3.

4.3.1.4 Digital Output Rack

The Digital output rack contains one instation rack Power Supply Card and between one and

sixteen Digital Output boards, each capable of driving 64 LEDs at up to 30V 25mA. There are two

variants of Digital Output board, one sources current and the other sinks current. The system could

be used for any application requiring digital output, not just wallmap driving.

See Figure 5.

4.4 Test Sets

There are two test sets used with the TC12 System, an Instation test set and an Outstation test set.

4.4.1 Instation Test Set

The Instation Test Set (ITS) is housed in an attaché case, and connects to either the Modem pcbs

or the OTU pcbs. Facilities are also provided for use as a handset terminal or for use as a monitor

for the Instation PC (during installation and maintenance).

See Figure 6.

4.4.2 Outstation Test Set

The Outstation test set is a portable unit housed in a small grey metal case. It requires a mains

supply for operation and two cable forms with which to interface with the OTU being tested.

See Figure 7.

4.5 Freestanding Outstation

The freestanding outstation is a rack which can be bolted into any Traffic Controller. It contains a

Power Supply, an OTU PCB and up to four detector PCBs. Two connectors allow the OTU inputs

and outputs to be wired up to the controller and / or detector cards. The OTU is delivered with a

cable for this purpose. There is also a pair of test jacks on the board to allow connection to the

instation test set to monitor communications data and measure signal levels when communications

is via telephone lines.

See Figure 5.

The OTU PCB may be equipped with a daughter board to allow RS232 communications with the

Instation.

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