Nortel Networks BCM200, 400 4.0 manual ATA2 ASM8 ASM8+ GASM8 Gasi

Chapter 2 Introducing the BCM hardware 59

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

464section 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. Figure 33 on page 59 shows the GASM8.

Figure 33 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	ATA2		ASM8	ASM8+		GASM8		GASI
Ringing frequency	20	Hz ± 1 Hz	20 Hz ± 1 Hz	20	Hz ±1 Hz	20	Hz ±1 Hz	20	Hz ±1 Hz
(North America)
Ringing frequency	25	Hz ± 1 Hz	25 Hz ± 1 Hz	25	Hz ± 1 Hz	25	Hz ± 1 Hz	25	Hz ± 1 Hz
(Europe)
Ringing voltage (North	80 V rms ± 10%		55 V rms ± 10%	65 V rms ± 10%		65 V rms ± 10%		65 V rms ± 10%
America)
Ringing voltage	75	V rms +/-	N/A	65	V rms ± 10%	65	V rms ± 10%	65	V rms ± 10%
(Europe)	10%

BCM200/400 4.0 Installation and Maintenance Guide