Instruction manual

MEGAPLEX Cabling 15
CHAPTER 3
MEGAPLEX CABLING
This chapter applies equally to MEGAPLEX, MEGAPLEX/2 and
MEGAPLEX/RS.
The MEGAPLEX serial I/O subsystem supports a wide variety of
devices (both DCE and DTE), a range of cables from 4-wire RJ-11 to
10-wire RJ-45 and several different types of end connectors (DB-25,
DB-9 and RJ-11). With careful attention to the information presented
below, and the optional use of a breakout box, the correct pin connec-
tions for the installation should be assured.
All MEGAPLEX ports are of the CS or FM type and provide a stan-
dard RS-232 interface with modem control signals. FM types provide
full modem control signals.
To assist in wiring the MEGAPLEX subsystem, Equinox sells a
complete set of cabling accessories. See an Equinox Ordering Guide
for more information.
MEGAPLEX cabling (for all versions of MEGAPLEX) is divided into
two areas:
● The host controller to cluster multiplexer link.
● Cluster multiplexer wiring to terminals, modem and
printers.
Cluster Multiplexer Link Wiring
The link between the MCC 24x4 host controller and each CMX-24 and
CMX-24D cluster multiplexer is a 4-wire link. Data and control
signals on this cluster multiplexer link are encoded for high perfor-
mance and are not available for any other purpose.
On the mounting bracket of the host controller are 4 modular link
jacks named A, B, C and D. Each link jack connects to a cluster
multiplexer with a two-twisted-pair cable. The 24 physical ports on
each cluster multiplexer are then mapped by the software device
driver into device names as appropriate to the specific driver selected.