Peavey MediaMatrix Nion, Hardware Manual

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NION Hardware Manual
September 30, 2010 Version 1.6.1.0 71
Although the wiring standard used in CAT 5 cabling originates with AT&T, it is functionally
different for configuring Ethernet cabling. The Bell System uses a series of colors to identify
wire pairs. This color scheme identifies the pair numbers, and conductor polarity, and applies
to the
wire , not the connector. It is important to know what pairs are which, and the function of
the pins on the RJ-45 connector. The colors are BLUE, ORANGE, GREEN and BROWN for
the first four pairs.
What is often confusing is that the pair numbers do not line up with the pin numbers on the
RJ-45 connector. In other words, conductor one of the cable (White w/Blue Strip) is not
terminated to pin one of the connector. The AT&T connecting standard always uses the
middle pins for the first pair. After that, they are staggered around, primarily to prevent
crosstalk between adjacent pairs. For Ethernet, only the ORANGE and GREEN pairs are
actually used.
For Ethernet, the BLUE and BROWN pairs are not used. The ORANGE pair is transmit (TX),
and the GREEN pair is receive (RX). There is a positive and negative conductor for each pair,
indicated by the color code. Notice on the chart that the order of the wire pairs does not follow
the connector pins. The first wire of a given pair is always the white wire with a colored stripe
and is the positive conductor. The corresponding colored wire with the white stripe is the
negative conductor for that pair.
Notes:
ƒ A single CAT 5 cable run must not exceed 100 meters.
ƒ Make sure your connector matches your cable type. If you are not sure, use the bent tine
variety.
ƒ When terminating CAT 5 cable, it is important that the natural twist of each pair is carried
through as close as possible to the point of termination at the connector.
ƒ We recommend that you familiarize yourself with the wiring color schemes so they are
second nature to you. An error in the cabling of an audio network is often the primary
cause of system errors
ƒ It is very important that you build the cable with all pairs properly terminated. This will
prevent any confusion later, and give your cable a solid mechanical connection.
GPIO overview
NION and CAB products include a versatile GPIO (General Purpose Input Output) system at
the rear for terminating external logic, controls, relays and other external systems. Each
control pin is supported by NWare for configuration, control and monitoring. Any
combination of control pins may be used simultaneously, regardless of the configuration.
Caution: The pin assignments for the GPIO ports on the NION and CAB devices are not the
same. Please be sure to check the documentation carefully when connecting devices to the
ports.