AD278A/AD279A PCI MUX Support Guide, June 2006

Introduction
AD278A/AD279A PCI Multiplexer Components
Chapter 1
18
Figure 1-2 shows AD279A PCI MUX 64-port adapter.
Figure 1-2 AD279A PCI MUX 64-Port Adapter
Port Modules
A port module is an interface between the AD279A PCI MUX 64-port adapter and the RS-232 peripheral
device. Table 1-6 lists the port modules that can be connected to the AD279A PCI MUX 64-port adapter.
Each AD279A PCI MUX 64-port adapter supports a maximum of four port modules (64 ports) connected
together. The RS-232 RJ45 port module (AD280A) and RS-232 DB25 port module (AD281A) can be
intermixed using an EBI cable. Cables used to connect port modules two, three, and four are known as EBI
cables. They are 16 inches (0.40640 metre) in length. The RJ45 and DB25 port modules use the same EBI
cable.
The AD280A and the AD281A use the same power supply (AD280-2001A).
NOTE The AD279A PCI MUX 64-port adapter can support 2 port modules or up to 32 port
configurations without the port module power supply. The port module power supply is
required on the third port module and the fourth port module or 33 through 64 port
configurations.
Table 1-6 Port Modules
Product
Number
Description Interface
Number
of Ports
AD280A HP 16-port RS 232
RJ-45 port module
RS-232 RJ45 16
AD281A HP 16-port RS 232
DB-25 port module
RS-232 DB25 16