Nortel Networks BCM50 manual ATA2 ASM8 ASM8+ Gasm Gasi

Chapter 2 Introducing the BCM50 hardware 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	ATA2	ASM8	ASM8+	GASM	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%
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	3	1	2	2	2
number
ATA2 to BCM50 loop	135 ohms	N/A	N/A	N/A	N/A
resistance (cable only)	(800 m of
	0.5-mm wire or
	2600 ft of 24
	AWG wire)
Analog loop resistance	1300 ohms	250 ohms (1538	200 ohms (1231	200 ohms (1231	200 ohms (1231
on terminal side for	(7200 m of	m of 0.5-mm	m of 0.5-mm	m of 0.5-mm	m of 0.5-mm
voice applications	0.5-mm wire or	wire or 5000 ft of	wire or 4000 ft of	wire or 4000 ft of	wire or 4000 ft of
(cable only)	26000 ft of 24	24 AWG wire)	24 AWG wire)	24 AWG wire)	24 AWG wire)
	AWG wire)

BCM50 Installation and Maintenance Guide