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WAN 2 Module E3/DS3 Coax Cables and Connectors
90
IBM 8265: Planning and Site Preparation Guide
The media for both E3 and DS3 daughter cards is a 75 ohm impedance coaxial pair
with BNC connectors for each direction of transmission.
Cabling Information
Table 60. E3/DS3 Cabling Details (BNC 75 ohm)
Cable Type
Impedance
RG59
75 ohm
Note:
the 25 dB attenuation @ 400 MHz corresponds to an attenuation of
12 dB @ 17 MHz, assuming that follows approximately a
Cabling Distances
Because the maximum recommended distance depends on the quality of cabling
used, the values given in are approximate.
Table 61. E3/DS3 Cabling Distances
I/O Card Type
Cable Type
E3
RG59 coax
DS3
RG59 coax
Attenuation @ 400 MHz
25 dB MAX / 100 m
Maximum Recommended Distance
100 m (330 ft) based on a power budget of 12 dB
@ 17 MHz.
68 m (225 ft) default, 135 m (450 ft).
If cable distance exceeds 68 m (225 ft), the default
configuration setting for the port must be changed.
See the Media Module Reference Guide for details
on how to do this).
f
law.
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