Nortel BCM200 Installation And Maintenance Manual page 60

60 Chapter 2 Introducing the BCM hardware
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.
The ASM, ASM8, ASM8+, and GASM8 each have one RJ-21 connector on the faceplate.
34 on page 60
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.
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 shows the specifications for ATA2, ASM8, ASM8+, GASM8, and global analog station
interface (GASI).
Table 10 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)
N0060612 N0060612
shows the GASM8.
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%
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
GASM8 GASI
±
20 Hz 1 Hz 20 Hz
±
25 Hz 1 Hz 25 Hz
±
10% 65 V rms
±
10% 65 V rms
Figure
±
1 Hz
±
1 Hz
±
10%
±
10%