Avocent SST-64P, Installer/User Manual, Page: 15 / 31

Chapter 2: Installation and Configuration 7
Installing Port Modules
The SST-64P PCI adapter has one connector: a high-density 26-pin expansion bus port. You can
connect up to four port modules, each with sixteen RJ-45 serial ports, on the expansion bus port.
This provides the SST-64P PCI adapter a total of 64 serial ports.
The 26-pin expansion bus port is a ring topology, which contains dedicated time slots for 64 ports
of full-duplex serial data. The last port module connected to the adapter terminates the ring.
Two types of expansion bus cables are provided to connect port modules to SST-64P PCI adapters:
• Host Bus Cables (HBCs) accomodate serial data transfers and power for the downstream port
modules. HBCs came in two sizes: 4-foot (PN 690227) and 1-foot (PN 690374).
• Expansion Bus Cables (EBCs) accomodate only serial data transfers. When connected to an
EBC, downstream port modules require PS-4 power supplies for operational power. EBCs
come in three sizes: 10-feet (PN 690341), 25-feet (PN 690302) and 100-feet (PN 690306).
Figure 2.2 shows a port module, which contains sixteen 10-wire RJ-45 serial ports, two 26-pin
expansion bus ports (1 INPUT port for upstream connectivity and 1 OUTPUT port for downstream
connectivity). The port module also contains an external power input connector to attach the PS-4
power adapter should it require external power.
Figure 2.2: Port Module
Port modules allow you to connect serial devices to the SST-64P PCI adapter.
Port Module LEDs
Each port module contains an online LED and a power LED indicator. The online LED functions
only after you install the driver software and indicates that the port module is available for use.
The power LED lights up when power is present to the port module.
Online LED
Power LED
Serial Ports
Rack Mount Ear Rack Mount Ear Expansion Bus
Input Port
Expansion Bus
Output Port
External
Power Input
ONLINE
POWER
EXTERNAL
POWER
PM16
INPUT OUTPUT
7 6 1 2 3 4 5 8 15 14 10 11 12 13 16 9