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Hardware Description
2-37
(SDC) or Unshielded Twisted Pair (UTP) cables. For both cable types, there are limitations on
the length of cable runs to ensure reliable communication.
SDC Serial Distribution Cables (SDC) are proprietary, 2-conductor, twisted pair, shielded cables
that are 0.34 in (0.9 cm) in diameter. The wires and shield have the following colors and
assignments.
Pink + positive
Blue - negative
SDC branch cables are limited to a maximum length per branch of 152 m (500 ft.).
XSDC For longer cable runs, Philips shielded, Extended System Distribution Cable (XSDC) can
be used. It has heavier gauge conductor wires with a cable diameter of 1.1 cm (0.44 in).
XSDC wire colors and assignments are the same as for SDC. XSDC branch cables are limited
to a maximum length per branch of 304 m (1000 ft.). Only two XSDC cable runs are allowed
per SCC.
UTP SDN branch cables can also be LAN Ethernet, category 5, Unshielded Twisted Pair (UTP)
cable. UTP cable consists of 4 twisted pairs of unshielded conductors in which one pair
(BLUE/white and WHITE/blue) carries the SDN signal and the other pairs are connected to
ground. UTP cable is compatible with either the 568A or 568B wiring standards for RJ 45
jacks. UTP branch cables are limited to a maximum length per branch of 90 m
(295 ft.).
SDC, XSDC, and UTP cables are available from Philips. Specifications for these branch
cables are summarized in the following table.
LDC Local Distribution Cables (LDC) for connecting the processing unit to SDN wall boxes are
Philips proprietary computer cables with a 9-pin connection to the processing unit and an
Philips 5-pin barrel connector to an Philips SDN wall box. A 15 m (50 ft.) LDC cable kit
(M3181A #A35) is also available. Cables and wall boxes are described in the following
sections.
Shield
drain ground (GND)
Table 2-1. Branch Cables for Philips Systems
Cable + Signal - Signal Shield Maximum Length
Type Color Color Color Meters Feet
SDC Pink Blue Green 152 500
XSDC Pink Blue Green 304 1000
UTP BLUE/white WHITE/blue All other 90 295
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