Studio Expansion microphones (Longer cable)

[povallee]

Hi,

We've purchased the Expansion Microphone (2200-69631-001) that can be connected with the Polycom Studio. In the box there is a RJ-12,  24 ft long cable that came with it (2457-69573-001) but because of our installation the cable is not long enough. We had a 50 ft RJ-12 cable in stock so i've tried this cable but for some reason it doesn't seems to work. The cable pin out seems to be the same but there is no power going into the expansion microphone when we are using our own cable. We've tested the cable with a cable tester and the cable is good.

I was wondering if there is any specifications available about the cable use to connect the Studio to an expansion microphone ? I'm looking for details about the cable pin out, shield requirement, cable max lengh but I couldn't find anything online. Any idea where i could find this information ?

Thanks

[povallee · Accepted solution]

For those interested i've received the following information from our rep:

Polycom is not using normal cable for Debut  Micpod, it’s customized 

1. Wires 1, 3, 6 for microphones are specially shielded for voice transmission quality  
2. The outer shield – the invisible 7th wire – is used as GND signal. 

If other 6P6C cable is used, it might work if with luck. But typically the voice quality might be impaired (reason 1) or it just doesn’t work(reason 2).

[napooler]

Looking to see if there was a resolution to this. It is marked as solved, but no specific resolution is documented...

[Colin_Birchall]

We have a client that requires a 15M cable if we can source one in the UK.  The current cable with the MicPod is not long enough and as shown above an RJ12 cable will not do the job.

[DJG93]

We were able use double the length by connecting two 2457-69573-001 with a jumper made of two cat 6 shielded connectors and short piece of Cat6 shielded cable.  The RJ12 was wide enough to touch the side of the connector to provide continuity for the shield which Poly seems to be using for the power to the microphone. Possibly something like this barrel below would work? (maybe just need to pry the side contacts a bit if it is not so tight.)

Tripp Lite Cat6 Straight-Through Modular Shielded Compact In-Line Coupler (RJ45 F/F), TAA https://www.tripplite.com/support/N234001SH

[SteffenBaierUK]

Hello all,

please remember any extension is at your own risk and not supported by Poly as we cannot ensure the integrity of the products used.

Best regards

Steffen Baier