Chapter 2 Introducing the BCM50 hardware 45
BCM50 Installation and Maintenance Guide
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.
Table 5 shows the specifications for ATA2, ASM8, GASM, and GASI.
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 ATA2, ASM8, ASM8+, GASM, and GASI analog device specifications (Sheet 1 of 2)
Specification ATA2 ASM8 ASM8+ GASM GASI
Ringing frequency
(North America)
20 Hz ± 1 Hz 20 Hz ± 1 Hz 20 Hz ±1 Hz 20 Hz ±1 Hz 20 Hz ±1 Hz
Ringing frequency
(Europe)
25 Hz
± 1 Hz 25 Hz ± 1 Hz 25 Hz ± 1 Hz 25 Hz ± 1 Hz 25 Hz ± 1 Hz
Ringing voltage (North
America)
80 V rms
± 10% 55 V rms ± 10% 65 V rms ± 10% 65 V rms ± 10% 65 V rms ± 10%
Ringing voltage
(Europe)
75 V rms +/-
10%
N/A 65 V rms
± 10% 65 V rms ± 10% 65 V rms ± 10%
Loop current 20 mA minimum 20 mA minimum 20 mA minimum 20 mA minimum 20 mA minimum
Battery feed voltage -48 V dc
± 10% -48 V dc ± 10% -29 V dc ± 10% -48 V dc ± 10% -48 V dc ± 10%
FIC code OL13ABC N/A N/A N/A N/A
Ringer equivalency
number
31222
ATA2 to BCM50 loop
resistance (cable only)
135 ohms
(800 m of
0.5-mm wire or
2600 ft of 24
AWG wire)
N/A N/A N/A N/A
Analog loop resistance
on terminal side for
voice applications
(cable only)
1300 ohms
(7200 m of
0.5-mm wire or
26000 ft of 24
AWG wire)
250 ohms (1538
m of 0.5-mm
wire or 5000 ft of
24 AWG wire)
200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire)
200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire)
200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire)
