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TC12 General Handbook

666/HB/43100/000 Page 5-1 Issue 9

5. SYSTEM FACILITIES

Each Instation can contain up to 4 racks of TC12 equipment. These can be either ITU racks for

communication or Digital Output racks for wallmap driving. An ITU rack can contain up to 4

modem boards, each of which contains 4 modems capable of driving a 2 or 4 wire telephone line.

Each telephone line supports one or more OTUs depending on the line configuration - see 5.1.4. A

transformer board can be included with each modem board, in the ITU rack, to allow the 4 modems

on a board to drive eight 2-wire radial telephone lines.

The Instation can also be set up to communicate with suitably equipped OTUs via direct RS232

serial links instead of telephone lines.

5.1 General System

5.1.1 Baud Rate

TC12 operates at 300, 600 and 1200 bits per second in full or half duplex mode.

Communications over telephone lines is in either two or four wire mode (full duplex may only be

used in 4-wire mode).

5.1.2 Modem Signal Levels

5.1.2.1 Transmit

The modem transmit signals can be set to the following levels at both the instation and outstation:

0dBm

-3dBm

-6dBm

-9dBm

-10dBm

-13dBm

-16dBm

5.1.2.2 Receive

The modem receive line levels are set up by switch settings on both the ITU and OTU. They can

be set so that the minimum signal level registered by the modem is either -33dBm, -39dBm or

-42dBm.

5.1.3 Connection to Leased Telephone Line

5.1.3.1 BT Lines for use with TC12 Systems

(a) For Point to Point circuits:-

Keyline 3, option 1 - Two wire presentation

Keyline 3, option 2 - Four wire presentation

Analogue Standard ( Data) – Either Two or Four wire presentation

Keyline 3, option 3 - Two wire presentation, better quality

Keyline 3, option 4 - Four wire presentation, better quality

Analogue Premier – Either Two or Four wire presentation

(b) For Multi point circuits:-

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