Contemporary-control-systems EXP Expansion Modules User Manual Manual de usuario descargar pdf (Pagina 13)

RG-59/u cable. We recommend RG-62/u because it is a better

match to the transceivers and a full 2000 foot segment distance

can be achieved using this cable. Both cables support male BNC

connectors which the -CXS expansion module accommodates.

2.5.2 Connecting Coaxial Cable Bus Networks (-CXB)

There is no expansion module for a bus transceiver (-CXB);

however, bus topology is supported with the MOD HUB. In a

bus configuration, one end of the segment terminates into a

-CXS expansion module without a passive terminator.

However, the other end of the bus segment is terminated with

passive terminator. Be sure to use the proper passive terminator,

93 ohms for RG-62/u and 75 ohms for RG-59/u. Do not attach

the -CXS expansion module in the middle of a bus segment

using a BNC “T” connector. However, the same effect can be

accomplished by splitting the bus segment into two pieces, each

of which attaches to a -CXS port. Again, no passive termination

needs to be applied to the hub side of a bus segment.

2.5.3 Connecting Twisted-Pair Star Networks (-TPS)

Each -TPS port is constructed as a -CXS port with an internal

BALUN transformer. A BALUN (which is an acronym for

BALanced-UNbalanced) connects the single-ended -CXS

transceiver to a balanced transceiver suitable for driving

balanced twisted-pair cabling. The internal BALUN in the -TPS

port is compatible in wiring to an external MUX LAB's part

number 10070 BALUN. Therefore, a -TPS port can directly

connect to another -TPS port on either a hub or a NIM or

connect to an external BALUN attached to a -CXS port. In both

cases use straight-through twisted-pair cable with RJ-11

connectors. Straight-through cable provides a one to one

correspondence in cable connections at both ends. Straight-

through cable can be identified as follows. Take both connectors

from a cable length and lay them side by side with the locking

clip facing the same direction. The wire color present on the

left-most side of one connector must be the same color on the

TD401600-0MO

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Contemporary-control-systems EXP Expansion Modules User Manual Manual de usuario Pagina 13