Nortel BCM50, Руководство по установке и обслуживанию

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46 Chapter 2 Introducing the BCM50 hardware
N0027152 01 N0027152 01
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.
Analog loop resistance
on terminal side for
data applications
(cable only) 200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire) 250 ohms (1538
m of 0.5-mm
wire or 5000 ft of
24 AWG wire) 200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire) 200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire) 200 ohms (1231
m of 0.5-mm
wire or 4000 ft of
24 AWG wire)
Input impedance at tip
and ring 600 ohms 600 ohms 600 ohms 600 ohms 600 ohms
Return loss > 20 dB for 200
to 3400 Hz
(when
terminated with
600 ohms) > 20 dB for 200
to 3400 Hz
(when
terminated with
600 ohms) > 20 dB for 200
to 3400 Hz
(when
terminated with
600 ohms) > 20 dB for 200
to 3400 Hz
(when
terminated with
600 ohms) > 20 dB for 200
to 3400 Hz
(when
terminated with
600 ohms)
Insertion loss on an
internal call ATA2 to BCM50
loss 3.0 dB
±
0.5
dB
ATA2 to BCM50
loss 3.0 dB
±
0.5
dB
ATA2 to BCM50
loss 3.0 dB
±
0.5
dB
ATA2 to BCM50
loss 3.0 dB
±
0.5
dB
ATA2 to BCM50
loss 3.0 dB
±
0.5
dB
Insertion loss on an
external call ATA2 to BCM50
loss 2.2 dB +/-
1.0 dB; BCM50
to ATA2 loss 0.5
dB
±
1.0 dB
ASM to BCM50
loss 3.0 dB +/-
1.0 dB; BCM50
to ASM loss 0.5
dB
±
1.0 dB
ASM to BCM50
loss 3.0 dB +/-
1.0 dB; BCM50
to ASM loss 0.5
dB
±
1.0 dB
ASM to BCM50
loss 3.0 dB +/-
1.0 dB; BCM50
to ASM loss 0.5
dB
±
1.0 dB
ASM to BCM50
loss 3.0 dB +/-
1.0 dB; BCM50
to ASM loss 0.5
dB
±
1.0 dB
MWI type (see Note) Stutter tone Stutter tone Stutter tone/
/ Voltage MWI
(CO: 120 V) Stutter tone/
Reverse polarity/
Voltage MWI
(CO: 120 V) Stutter Tone/
Reverse polarity/
Voltage MWI
(PBX: 90 V)
Disconnect
supervision types N/A N/A OSI EIA/TIA 464
section
4.5.10.2.4/
4.5.10.2.5.1 OSI EIA/TIA 464
section
4.5.10.2.4/
4.5.10.2.5.1 N/A
Note: The MWI type depends on the country profile, and the MWI voltage shown is a maximum value.
Table 5 ATA2, ASM8, ASM8+, GASM, and GASI analog device specifications (Sheet 2 of 2)
Specification ATA2 ASM8 ASM8+ GASM GASI