IBM Serial I/O 128P Expandable Subsystem Hardware Installation Manual
1-4
Multiplexer Interface
Modules
Clusters of devices may be connected within a radius of 3,500 feet
(1Km) to the Adapter using Multiplexer Set which includes
Multiplexer Interface Modules (MIM), Cluster Multiplexers (CMX)
and Power Supply. (see Figure 1-4). In this application a 16-port
Cluster Multiplexer is located near the user devices and a low-cost
two-twisted-pair link (category 2 or above UTP) cable is run back to
the Multiplexer Interface Module. Cluster Multiplexers are ideal for
distributing devices in, as an example, a multi-building campus facility.
A variety of Expansion Modules are available. Any choice of
Expansion Modules may be freely intermixed on an Expansion Bus
with a maximum of four Expansion Modules per bus (see Figure 1-3).
Expansion Modules are used to connect peripheral devices directly to
the Expansion Bus. 16-port Expansion Modules are available with a
choice of DB-25 or RJ-45 connectors for RS-232 interfaces.
Expansion Modules
Figure 1-3. Adapter - Host Cable - Four Expansion Modules
