TELOS TWOX12 USER’S MANUAL
CABLE GUIDE
APPENDIX 2 169
11.2 Appendix 2 – Cable Guide
This appendix is intended to be a reference tool that covers various modular
telephone-style connectors used in Telos products.
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IMPORTANT!
Be very careful to label wiring used with RJ- style connectors. In some cases they have power
on them, and there is a risk of applying this power to something which does not expect it.
For this reason we suggest that you use different colored cables (or connector boots) on the
Desktop Director cables versus your Ethernet & ISDN Cables.
Pin Numbering on RJ style jacks
It is recommended practice to install modular jacks such that the pins are at the top of
the cavity when viewed. This helps to protect the contacts from water when
baseboards are mopped and from dust. When the jack is oriented in this position (i.e.
looking into the jack with the contact pins at the top) the pins are sequentially
numbered left to right. Note that some jacks may not have all pin positions populated,
however the numbering would still begin with the first position. For instance the RJ-
11 style jack is a 6-position 4-pin jack. Therefore it has pins 2,3,4, & 5. Pins 1 & 6
are missing.
Note that all but a few of the following cables use 8-position 8-pin miniature modular
connectors (RJ-45 style) on both ends. In today’s rapidly changing facilities it is
worth considering using a universal system for all of these cables. This strategy
allows the most flexibility since the same wiring configuration could be reused for a
different purpose without doing anything but documenting the change!
Therefore we recommend that you use the TIA-568A cable specification. This
specifies a Category 5 (Cat. 5) cable with 4 pairs wired straight through (both ends
wired identically) as follows:
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