Comtest Networks MTAS-192 METALLIC TEST ACCESS SYSTEM - Manual (Page 65)

CT-IG-MTAS192-2008-v1_8.doc Comtest Networks
MTAS-192
June 2006 Installation Guide 59
Problem Solution
Poor documentation
• Keep good records of all cables placed in the job
including all test data.
• Leave a copy of cabling documentation with the owner
and in the distribution center.
E.5. RJ45
Plug Types
CAT5 cables are typically terminated with RJ-45 connectors. Creating usable and long-
lasting patch cables requires more than just the appropriate cable. The appropriate
RJ45 plug types must also be used. There are a variety of RJ45 plug types available.
Be sure to choose the plug type that is appropriate for your particular application.
Consider the following when choosing RJ45 plugs.
• Choose RJ45 plugs that are specifically made for CAT5 round cable (not the
less-expensive Telco ones for flat satin cable). The ones rated for CAT5 (and
CAT6) have a thicker gold plating.
• Choose RJ45 plugs that are appropriate for your wire type (i.e., solid vs.
stranded). The aligned tine version is intended for use with stranded cable. The
bent tine version, although intended for use with solid core cable, may also be
used with stranded.
• Choose RJ45 plugs that are compatible with your RJ45 crimp tools. There may
be subtle differences between RJ45 plugs and tools of different manufacturers.
• Consider the pros and cons of using “no-fail” RJ45 plugs (the wires exit the end
of the plug, you crimp, then trim off the excess for a “no fail” connection).
Although they may provide a “no fail” connection, (1) they are more expensive,
(2) they leave the copper conductors exposed at the end, (3) they are not the
best for outdoor use, and (4) they are not ideal for patch cable use where the
plugs are not protected by the jack.
E.6.
568A vs. 568B Wiring Standards
For patch cables, 568B wiring is by far, the most common wiring method. Virtually all
pre-assembled patch cables are wired to the B standard. There is no difference in
connectivity between 568B and 568A cables. Therefore, a 568B patch cable should
work fine on a 568A cabling system, and visa-versa.
NOTE: Comtest offers custom CAT5E and CAT6 cables in both 568A and 568B wiring
schemes.
For both wiring standards, the pins of an RJ45 jack are numbered 1-8.
• Pin 1 is on the right when looking at the face of the jack.
• Pin 8 is on the left when looking at the face of the jack.
• Pin 1 is on the left when looking at the face of the plug.
• Pin 8 is on the right when looking at the face of the plug.