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Custon Cabling Guidelines

If it is necessary to create custom cables on site, you

must follow these speciﬁcations to ensure

compliance with the Qt PRO™ equipment.

Any quality solid conductor 24 AWG CAT cable

is acceptable, provided it meets local code require-

ments and:

1) Meets requirements for plenum installation

(plenum-rated) if installed in a return air plenum.

Shielding is not required. Unshielded Twisted Pair

(UTP) cable is satisfactory. Snagless boots are not

required.

2) Has bent* 3-tyne (prong) contacts straddling each

conductor in RJ-45 connectors. See graphic below.

Aligned 2-tyne contacts intended for use

with stranded conductors are not acceptable under

any circumstances. Failure to follow this require-

ment will result in intermittent contact and inconsis-

tent system operation.

3) Once fabricated with RJ-45 connector, is

ﬁeld-tested before installation for continuity, shorts

and 1:1 (straight through) connection using

a standard network CAT cable tester.

2 types of RJ-45 connectors:

CORRECT INCORRECT

RJ-45 connector RJ-45 connector

with bent tyne with aligned

tyne

* There are two types of RJ-45 connectors. The “bent 3-tyne” con-

nector is intended for use with solid core CAT cable. The “aligned

tyne” connector is intended for use with stranded CAT cable.

Errors occur when incorrect cable/connector combinations are

used. Diagram shows the end on a view of a single contact in a

modular connector. The bent 3-tyne contact has the tines offset

from each other to straddle the conductor. USE THE BENT 3-TYNE

CONNECTOR FOR ALL Qt PRO™ INSTALLATIONS. Bent 3-tyne

connectors are available at Home Depot and most CAT cable sup-

pliers.

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CAMBRIDGE QT Specifiche Pagina 12