Nortel Networks manual BCM50 hardware, Rackmount shelf

46Chapter 2 Introducing the BCM50 hardware

Table 5 ATA2, ASM8, ASM8+, GASM, and GASI analog device specifications (Sheet 2 of 2)

Specification	ATA2	ASM8	ASM8+	GASM	GASI
Analog loop resistance	200 ohms (1231	250 ohms (1538	200 ohms (1231	200 ohms (1231	200 ohms (1231
on terminal side for	m of 0.5-mm	m of 0.5-mm	m of 0.5-mm	m of 0.5-mm	m of 0.5-mm
data applications	wire or 4000 ft of	wire or 5000 ft of	wire or 4000 ft of	wire or 4000 ft of	wire or 4000 ft of
(cable only)	24 AWG wire)	24 AWG wire)	24 AWG wire)	24 AWG wire)	24 AWG wire)
Input impedance at tip	600 ohms	600 ohms	600 ohms	600 ohms	600 ohms
and ring
Return loss	> 20 dB for 200	> 20 dB for 200	> 20 dB for 200	> 20 dB for 200	> 20 dB for 200
	to 3400 Hz	to 3400 Hz	to 3400 Hz	to 3400 Hz	to 3400 Hz
	(when	(when	(when	(when	(when
	terminated with	terminated with	terminated with	terminated with	terminated with
	600 ohms)	600 ohms)	600 ohms)	600 ohms)	600 ohms)
Insertion loss on an	ATA2 to BCM50	ATA2 to BCM50	ATA2 to BCM50	ATA2 to BCM50	ATA2 to BCM50
internal call	loss 3.0 dB ± 0.5	loss 3.0 dB ± 0.5	loss 3.0 dB ± 0.5	loss 3.0 dB ± 0.5	loss 3.0 dB ± 0.5
	dB	dB	dB	dB	dB
Insertion loss on an	ATA2 to BCM50	ASM to BCM50	ASM to BCM50	ASM to BCM50	ASM to BCM50
external call	loss 2.2 dB +/-	loss 3.0 dB +/-	loss 3.0 dB +/-	loss 3.0 dB +/-	loss 3.0 dB +/-
	1.0 dB; BCM50	1.0 dB; BCM50	1.0 dB; BCM50	1.0 dB; BCM50	1.0 dB; BCM50
	to ATA2 loss 0.5	to ASM loss 0.5	to ASM loss 0.5	to ASM loss 0.5	to ASM loss 0.5
	dB ± 1.0 dB	dB ± 1.0 dB	dB ± 1.0 dB	dB ± 1.0 dB	dB ± 1.0 dB
MWI type (see Note)	Stutter tone	Stutter tone	Stutter tone/	Stutter tone/	Stutter Tone/
			/ Voltage MWI	Reverse polarity/	Reverse polarity/
			(CO: 120 V)	Voltage MWI	Voltage MWI
				(CO: 120 V)	(PBX: 90 V)
Disconnect	N/A	N/A	OSI EIA/TIA 464	OSI EIA/TIA 464	N/A
supervision types			section	section
			4.5.10.2.4/	4.5.10.2.4/
			4.5.10.2.5.1	4.5.10.2.5.1

Note: The MWI type depends on the country profile, and the MWI voltage shown is a maximum value.

BCM50 hardware

The following BCM50 hardware items simplify the setup and connection of the system:

•“Rackmount shelf”

•“Wallmount bracket” on page 47

•“Patch panel” on page 47

•“Wiring field card (WFC)” on page 48

Rackmount shelf

To rackmount a BCM50 unit (main unit or expansion unit), you need a rackmount shelf. The rackmount shelf mounts in a standard 19-inch equipment rack. The BCM50 unit then clips into the tabs on the rackmount shelf. These tabs prevent the unit from sliding around or falling off the shelf.

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