IBM 1PA, Operational, Installation, And Maintenance Manual

Page: 82 / 108

RJ plugs crimp the copper wire and provide strain relief to the cable:
Crimping
Using the incorrect plug results in unreliable connections. For solid wire
installation, RJ plugs straddle the copper wire when crimped.
Strain relief
To provide strain relief to the cable, the RJ plug opening must match the
cable type (round or flat oval). For all UTP cable, use a flat oval plug.
Ÿ
Solid wire is used for almost all UTP cable that is used in long
point-to-point runs (for example, between punch down blocks).
Ÿ
Solid wire is used for the short patch cables between patch panels or
from the wall plug to the device.
Most RJ connectors accommodate wire gauges of 24 or 26 gauge, not 22 gauge.
This limitation is based on the physical pin spacing standard of the connectors.
Although 22 gauge solid wire is often used between punch down blocks (for
reduced attenuation), it should not be used with RJ connectors unless specifically
approved by the manufacturer.
When attaching RJ plugs to UTP cable, always use plugs and crimpers that are
made or approved by the same manufacturer. Mixing the components from
different manufacturers can result in unreliable connections.
DB25 Pinouts
The DB connectors used in the block, multiplexer, and cables use the pinouts in
Table 6-2.
Table 6-2. DB25 Pinouts and Standards
Host Port Phase DB25 PIN
0
B
A 14
2
1
B
A 15
3
2
B
A 16
4
3
B
A 17
5
4
B
A 18
6
5
B
A 19
7
6
B
A 20
8
7
B
A 21
9
6-4
Planning, Installation, and Maintenance Guide