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204 Chapter 13 Installing Analog Terminal Adapters
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ATA 2 data communication
The ATA 2 connects a standard analog data device, such as a FAX or modem, to the Business
Communications Manager system. This section shows the additional steps required to install
ATA 2 for data communication.
Data transmission requirements
When using the ATA 2 for data transmission, the analog loop resistance must not exceed 200
ohms. (for example: 730 m of 0.4 mm wire or 2,400 ft. of 26 AWG wire.)
The external line assigned to the ATA 2 must follow the transmission network requirements
described in the data communication device specifications.
Transmission rates (baud) over 1,200 bps require a modulation design compatible with the
telephone line bandwidth. Use a conditioned external line to prevent data corruption during
transmission.
FAX and modem transmission compatibility
The ATA 2 is compatible with all commercial FAX and modem protocols. When connected to an
ATA 2, the Business Communications Manager system supports data transmission rates a
maximum of and including 28.8 kbit/s.
Note: Maximum loss from the ATA 2 analog terminal to the CO must be 10 dB or less at
1 kHz. If the loss exceeds this limit, condition the line. This loss ensures correct data
transmission for different types of data terminals.
Note: Nortel Networks cannot guarantee the maximum data transmission rate because the
maximum rate is subject to the quality of the end-to-end channel.