HP 800 HP DTC Cabling and Racking Guide - Page 90

Cabling Tips

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8 Cabling Tips Cabling Tips You may find the advice in this section useful when making your own cables, planning a cabling scheme and making cable connections. Twisted pair cables When connecting twisted pair cables to cross-connect blocks, keep each pair twisted all the way up to the connecting pins of the cross-connect block. Pairs not kept twisted in this way are susceptible to crosstalk. When making twisted pair connections, keep conductors of a pair together. Do not form a pair by taking a conductor of one pair and twisting it with a conductor of another pair. If shielded twisted pair cable is used, it is recommended that the shield is grounded. When the cable is stripped to expose the shield for grounding, any exposed wire pairs should be twisted more tightly to reduce their susceptibility to magnetic interference. When transmitting RS-232 signals over twisted pair cables, form a pair with TD and SGND, RD and a duplicated SGND or with a modem signal (e.g. RTS for DTC hardware control). Do not form a pair with TD and RD. 84

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84
Cabling Tips
8
Cabling Tips
You may find the advice in this section useful when making your own cables,
planning a cabling scheme and making cable connections.
Twisted pair cables
When connecting twisted pair cables to cross-connect blocks, keep each pair twisted
all the way up to the connecting pins of the cross-connect block. Pairs not kept
twisted in this way are susceptible to crosstalk.
When making twisted pair connections, keep conductors of a pair together. Do not
form a pair by taking a conductor of one pair and twisting it with a conductor of
another pair.
If shielded twisted pair cable is used, it is recommended that the shield is grounded.
When the cable is stripped to expose the shield for grounding, any exposed wire
pairs should be twisted more tightly to reduce their susceptibility to magnetic
interference.
When transmitting RS-232 signals over twisted pair cables, form a pair with TD and
SGND, RD and a duplicated SGND or with a modem signal (e.g. RTS for DTC
hardware control). Do not form a pair with TD and RD.