EXPRESS 8-PORT MUX
6
2. Introduction
This users’ manual applies to the Express 8-Port Mux, which is used with the IBM 5250 protocol. The 5250
family of products consists of IBM System 34, 36, 38, and the AS/400
®
, along with many supporting devices
manufactured by IBM and other companies. The Express 8-Port Mux works with all supporting devices that are
designed within the 5250 specifications.
2.1 Description
The Express 8-Port Mux has the unique ability to allow multiple AS/400 controller polling groups to be
transmitted over a single fiber optic pair. This feature allows all new AS/400e controllers to provide their
maximum throughput potential, in either 1-Mbps Optimized or 2-Mbps Express mode, by transparently
multiplexing the “split-polling” feature without requiring performance-robbing PTFs (Programming
Temporary Fixes).
All new IBM controllers support the split-polling feature as a means of achieving higher throughput rates, even
when connected to standard legacy devices. The Express 8-Port Mux allows the split-polling feature to remain
enabled, with performance of up to 4 times greater than standard legacy 1-Mbps 5250 protocol.
The Express 8-Port Mux has 8 shielded RJ-45 port connections as well as a DB25 “direct connection,”
eliminating the need for the twinax “brick” and associated twinaxial cabling. The link between the two muxes
uses multimode fiber cable with ST connectors. It can operate in both point-to-point and multipoint ring
topologies, reducing hardware requirements by up to 50%. Other features include advanced noise filtering,
LED port diagnostics, configurable UTP pin assignments, and a field-replaceable wide-ranging power supply.
2.2 What the Package Should Include
Remove the packing material and check for the items below. If anything is missing or damaged, contact Black
Box at (724) 746-5500.
• (1) Express 8-Port Mux (includes a 100-to-240-VAC input external power supply, attached on the rear panel)
• (1) AC power cord (North American units only)
• This users’ manual
CAUTION
Do not apply power to any damaged component!
