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Menu: :: Home :: Fascinations :: Goat Labs :: Miscellany :: RANT! :: Silly stuff :: Useful stuff :: Cars & Driving |
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:: Printable version | |
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Extension wiring
ConnectorsThere are two things you will inevitably come across when working with Panasonic phone systems: Krone blocks and DDK connectors. DDKs are used on every telecom-based port of your system as well as the door phone / door strike terminals. Panasonic use both 4- and 6-pin DDKs, 4-pin for COs, cell sites etc; and 6-pin for the extensions. If you open the front panel of your KX-TD1232 you will see a row of DDKs running from top to bottom, grouped in four blocks of four. These are your extension ports, port 01 being at the very bottom, port 16 at the top.Each connector is capable of carrying three pairs of wires. In telecomms, everything is referred to in pairs otherwise it starts getting rather confusing. Of these three pairs, two are actually used - one for analogue, one for digital. When wiring the system, the first thing I did was to take 8 lengths of CAT5 solid-core network cable and attach two pairs to each DDK. As CAT5 has four pairs, I run two DDK's worth down each span of CAT5, hence eight lengths. And the reason for using CAT5? I had plenty knocking around :-) Telephone cable is actually quite similar, but CAT5 has a slightly different twist applied to the conductors. For telecom systems, it makes very little difference.
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