B-1
3170-A2-GB20-20
December 1996
Technical Specifications
Overview
B-1
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Overview
The technical specifications for the Models 3172
and 3174 DSU/CSUs are listed in Table B-1.
Table B-1
(1 of 2)
Models 3172/3174 DSU/CSUs Technical Specifications
Specifications
Criteria
POWER REQUIREMENTS
Typical:
AC Power Module
Optional:
+24 Vdc
– 48 Vdc
– 48 Vdc Redundant
Refer to the labeling on the ac power module for input requirements
+20 Vdc to +32 Vdc, 0.50A
–38 Vdc to –60 Vdc, 0.25A
–38 Vdc to –60 Vdc, 0.25A
POWER CONSUMPTION
AND DISSIPATION
16.0 watts, 55.0 Btu per hour at 115 volts (ac power); 12.0 watts, 41 Btu per hour
at +24 and – 48 Vdc (dc power)
DTE Drop/Insert INTERFACE
Physical Interface
Framing Format
Coding Format
DB15 socket for 120 ohm twisted pair (balanced)
CRC-4, non-CRC-4
AMI, HDB3
NETWORK E1 INTERFACE
Physical Interface
Framing Format
Coding Format
Signal Recovery Capability
Typical Drive Distances:
75 ohm, coaxial cable
120 ohm, 22 AWG (0.6 mm)
120 ohm, 24 AWG (0.5 mm)
120 ohm, 26 AWG (0.4 mm)
BNC pair for 75 ohm coaxial cables (unbalanced) or
RJ48C for 120 ohm twisted pair (balanced)
CRC-4, non-CRC-4
HDB3
43 dB of cable attenuation at 1024 kHz
3.4 km
2.3 km
1.8 km
1.5 km
B
