User guide

Packet Over SONET Module Installation and User Guide 1-5
About the PoS Modules
The PoS module has the following key components:
• Two high-performance network processors
• A General Purpose Processor (GPP) subsystem
The network processors are programmable devices that participate with the Extreme “i”
chipset to support expanded functionality, features, and flexibility.
The GPP subsystem handles system control and I/O module management functions.
The GPP subsystem resides outside of the I/O module data path to optimize
performance.
PoS Module LED Indicators
The PoS modules are equipped with two module-level LED indicators (STATUS and
DIAG) and one port-level LED indicator for each network interface port on the PoS
module (see Figure 1-2 and Figure 1-3).
The STATUS LED indicator is located near the top end of the PoS module front panel,
near the ejector/injector handle. This LED indicator is a bi-color LED (displaying in
either green or amber) that signals the operating status of the module as a whole.
The DIAG LED indicator is located beside the STATUS LED. This LED is a single-color
LED (displaying in amber only) that flashes amber when diagnostics are running on the
module, and is solid amber if the module fails the diagnostics.
The port-level LED is an LED next to the port number identifying each fiber optic
network interface connector on the front panel of the module. The port LED is a bi-color
LED (displaying in either green or amber) that signals the operating status of that
network interface port.
For more information on PoS module LED states and their use in troubleshooting PoS
module problems, see “Verifying the Module Installation” on page 2-10.
Service Ports
The PoS modules are equipped with two front-panel service ports: one port is a
subminiature DB-9 connector; the other is a micro HD-15 connector (see Figure 1-1).
Both ports are reserved for use only by Extreme Networks technical support personnel
for diagnostic purposes.