Nortel BCM50 Installation And Maintenance Manual page 45

Figure 12 GASM faceplate LEDs and connectors
The ringer equivalency number (REN) (per port) for ASM8 is 1; the REN for ASM8+ and GASM
is 2.
Note: The termination of the analog interface can 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 to which the device is connected.
Table 5 shows the specifications for ATA2, ASM8, GASM, and GASI.
Table 5 ATA2, ASM8, ASM8+, GASM, and GASI analog device specifications (Sheet 1 of 2)
Specification
Ringing frequency
(North America)
Ringing frequency
(Europe)
Ringing voltage (North
America)
Ringing voltage
(Europe)
Loop current
Battery feed voltage
FIC code
Ringer equivalency
number
ATA2 to BCM50 loop
resistance (cable only)
Analog loop resistance
on terminal side for
voice applications
(cable only)
ATA2 ASM8
±
20 Hz 1 Hz 20 Hz
±
25 Hz 1 Hz 25 Hz
±
80 V rms 10% 55 V rms
75 V rms +/- N/A
10%
20 mA minimum 20 mA minimum 20 mA minimum 20 mA minimum 20 mA minimum
±
-48 V dc 10% -48 V dc
OL13ABC N/A
3 1
135 ohms N/A
(800 m of
0.5-mm wire or
2600 ft of 24
AWG wire)
1300 ohms 250 ohms (1538
(7200 m of m of 0.5-mm
0.5-mm wire or wire or 5000 ft of
26000 ft of 24 24 AWG wire)
AWG wire)
Chapter 2 Introducing the BCM50 hardware
ASM8+
± ±
1 Hz 20 Hz 1 Hz
± ±
1 Hz 25 Hz 1 Hz
± ±
10% 65 V rms 10% 65 V rms
±
65 V rms 10% 65 V rms
± ±
10% -29 V dc 10%
N/A
2
N/A
200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire)
BCM50 Installation and Maintenance Guide
GASM GASI
±
20 Hz 1 Hz 20 Hz
±
25 Hz 1 Hz 25 Hz
±
10% 65 V rms
±
10% 65 V rms
±
-48 V dc 10% -48 V dc
N/A N/A
2 2
N/A N/A
200 ohms (1231 200 ohms (1231
m of 0.5-mm m of 0.5-mm
wire or 4000 ft of wire or 4000 ft of
24 AWG wire) 24 AWG wire)
45
±
1 Hz
±
1 Hz
±
10%
±
10%
±
10%