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Installation and Maintenance Guide
Chapter 12
Installing Analog Terminal Adapters
This chapter provides installation instructions for the Analog Terminal Adapter 2 (ATA 2).
The ATA 2 connects a standard analog voice device or data communication device to the Business
Communications Manager system through a digital station module. Examples of analog voice
devices are analog telephones or answering machines. Examples of data communication devices
are modems and fax machines.
The ATA 2 provides on-premise service only (unexposed plant only).
Understanding pre-installation requirements
Before you attempt to install an ATA 2 device, ensure that your system and environment meet the
requirements listed in this section.
Environmental requirements
Line voltage (120 V) 102 – 132 V ac
Line voltage (230 V) 207 – 253 V ac
Temperature 0 – 50°C (32 – 122°F)
Relative humidity 5% – 95% non-condensing
Bridge taps Not allowed between the Business Communications Manager system
loading coils and Business Communications Manager ATA2
Operating requirements
Ringing signal (North America):
Frequency Voltage:
20 Hz ± 1 Hz
80 V rms ± 10%
Ringing signal (Europe):
Frequency voltage:
25 Hz ± 1 Hz
75 V rms ± 10%
Ringer equivalence number 3
Battery feed voltage - 48 V dc ± 10%
Loop current 20 mA minimum
FIC code OL13ABC
ATA 2 to Business Communications Manager
system loop resistance (cable only)
135 ohms maximum (for example: 800 m of
0.5 mm wire or 2,600 ft. of 24 AWG wire)
Analog loop resistance on terminal side for
voice applications (cable only)
1,300 ohms maximum (for example: 4,600 m of
0.4 mm wire or 15,000 ft. of 26 AWG wire)
Analog loop resistance on terminal for data
applications (cable only)
200 ohms maximum (for example: 730 m of
0.4 mm wire side or 2,400 ft. of 26 AWG wire)