Chapter 3 - Megaplex Cabling; Cluster Multiplexer Link Wiring - Equinox Systems MEGAPLEX Hardware Reference Manual

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.
MEGAPLEX Cabling 15