Connecting An Analog Telephone; Figure 48 Analog Telephone Installation Overview - Nortel BCM50 Installation And Maintenance Manual

The termination on the analog interface consistd 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 BCM50 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
external line to ATA 2
transmission rates (baud)

Connecting an analog telephone

Figure 48 shows the hardware configuration for connecting an analog device through an ATA 2 to
the BCM50.

Figure 48 Analog telephone installation overview

Central
office
less than 200 ohms (for example: 730 m of 0.4 mm wire or
2,400 ft. of 26 AWG wire.)
must follow the transmission network requirements
described in the data communication device specifications
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.
ATA 2 power cord
BCM50

Connecting an analog telephone

ATA 2
Line loop resistance:
135 ohms maximum
Analog telephone
Terminal loop resistance:
1300 ohms maximum
Install analog terminal adapters
139