Polycom HDX Series – Microphone (Clink2) Cable Pin-Out

by ScanSource Communications Tech Support on November 26, 2012 · 1 comment

in ScanSource Communications,Technology,Total Coverage Tech Connect,Videoconferencing



Client needs help with pin-out / wiring diagram for the Clink2 Crossover Cable to make their own version of p/n: (25 ft.) 2200-24009-001, (50 ft.) 2200-24008-001, (100 ft.) 2200-24010-001


To build a custom Conference Link2 cable, use shielded CAT5e or better, and terminate both end connectors (P1 and P2) with standard 8P8C plugs (for example, RJ45) using the wiring connections shown below. The maximum length for this cable is 100 feet (30 m). Note that this cable provides a crossover connection between pins 1 and 2 and pins 5 and 6.

Note: HDX 6000, 7000, 8000 require the use of a Walta (M) to RJ45 (F) adapter (p/n: 2457-25646-001) on each end of this cable to connect from the HDX to the Polycom Microphone Pod.


Pins P1

Pins P2

Pair 1

1, 2

5, 6

Pair 2

3, 4

3, 4

leave out the pin 4 wire

Pair 3

5, 6

1, 2

Pair 4

7, 8

7, 8

(48 volts)

The shield drain wire should tie to pin 3



The pin 3 connection straight-thru is VERY important (one could say critical) as it sets the ground reference for the clocking signals passed on the other signal pairs (1,2 and 5,6). Without it, the cable/system stops working at lengths greater than about 25 feet.

On Polycom-supplied cables, that pin-3 is also tied to the shield of the RJ45 connector… but it’s almost impossible to do that with the drain wire and not cause an intermittent short.  So field terminations can be with the drain wire connected to the metal shield of the RJ45 connector and an unused wire pair (perhaps blue/white…) connected to pin-3 straight thru.


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