Clear-Com HelixNet Partyline - Page 65

HelixNet | User Guide
Cat5/5e/6 XLR
White/Brown 3
Brown 2
Shield/Drain 1
It is important to connect the cable shield or drain wire to the XLR pin 1 to maintain the shield
integrity throughout the cable and connector.
Note : The total amount of cable deployed for a digital intercom line contributes to the total
capacitance of the line, even though some cables might not have a beltpack connected at
the other end. The more capacitance there is, the more attenuation there will be. Clear-
Com recommends that you use the minimum amount of cable. For example, daisy-chain
or split a cable at the far end, close to the beltpacks, rather than make two home runs to a
central patch panel.
3.6.2 Patch Panels
Clear-Com recommends XLR patch panels. These should be made of 3 pin XLR feed-through
adapters (for example, Neutrik NA3MDF) that maintain shield integrity from the back to the front.
These adapters also enable easier rewiring of the back or the front of the panel.
3.6.3 Splitter Boxes
Ensure that you split the digital intercom lines within a shielded enclosure. For example, a 1RU
shielded chassis, such as Middle Atlantic CH1, and daisy-chained XLR connectors (for example,
Neutrik NC3MD or NC3FD).
To prevent crosstalk between lines, ensure that each shielded splitter box contains only one digital
intercom line. If you have to split more than one digital intercom line, use multiple shielded
enclosures.
For more information on cabling see Cable connections.
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