Nortel Networks BCM1000 manual Analog transmission parameters North American systems, only

150 Chapter 12 Installing Analog Terminal Adapters

Analog transmission parameters (North American systems, only)

Input impedance at tip and ring	600 ohms
Return loss	> 20 dB for 200 to 3,400 Hz (when Network terminated
	with 600 ohms)
Insertion loss on an internal call	ATA 2 to Business Communications Manager system loss
	3.0 dB ± 0.5 dB
Insertion loss on an external call	ATA 2 to Business Communications Manager system loss
	2.2 dB ± 1.0 dB
	Business Communications Manager system to ATA 2 loss
	0.5 dB ± 1.0 dB

To test insertion loss once the analog device is attached to the system, refer to “Testing insertion loss measurement” on page 154.

Note: The termination on the analog interface may consist of any combination of devices subject only to the requirement that the sum of the RENs of all the devices does not exceed the REN of the interface the device is connect to.

Data device transmission requirements using an ATA 2

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.

CAUTION: Nortel Networks cannot guarantee the maximum data transmission rate because the maximum rate is subject to the quality of the end-to-end channel.

analog loop resistance	less than 200 ohms (for example: 730 m of 0.4 mm wire or
	2,400 ft. of 26 AWG wire.)
external line to 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
	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.

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