Nortel Networks BCM200/400 User Manual
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Chapter 2 Introducing the BCM hardware
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The ASM, ASM8, ASM8+, and GASM8 each have one RJ-21 connector on the faceplate.
shows the GASM8.
Figure 34 GASM8 faceplate LEDs and connectors
The ringer equivalency number (REN) per port for ASM8 is 1; the REN for ASM8+ and GASM8
is 2.
shows the specifications for ATA2, ASM8, ASM8+, GASM8, and global analog station
interface (GASI).
Disconnect supervision note: The central office disconnects the call after the
ASM8+ provides an open switch interval (OSI) to the off-hook station of 850 ms
(TIA/EIA 464 section 5.4.10.2.4; minimum is 600 ms) as a disconnect signal. If
the station remains on-hook after the disconnect signal, the ASM8+ disconnects
the station equipment from the network without returning a tone to it (TIA/EIA
464 section 5.4.10.2.5[1]). After the station equipment goes on-hook, the ASM8+
station interface is restored to on-hook (idle).
It is important to ensure that the device, application, or interface card connected to
an ASM8+ station interface conform to these on-hook and off-hook conditions.
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 10 ATA2, ASM8, ASM8+, GASM, and GASI analog device specifications (Sheet 1 of 2)
Specification
ATA2
ASM8
ASM8+
GASM8
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%