Installation and Reference Guide HP AdvanceStack 100Base-THub-12TX, Hub-12TXM, and Switch Modules 1997-06

HP Hub-12TX/Hub-12TXM Installation and Reference Guide
Hardware Reference 5-7
F
When more than 64 consecutive collisions occur on the cable
segment connected to a port, that port is automatically partitioned by
the hub. The hub automatically reconnects this port when a data
packet longer than 512 bits (normal) is transmitted or received by the
partitioned port without collision. This applies to all STP station ports
and the cascade port.
Port Status Indicators
There are 12 pairs of port status indicators. Each pair consists
of a
Link/Traffic LED (in the bottom row) and Partition/Disable LED
(in the top row). The last pair displays status for both the
12MDI-X and 12MDI port, either of which is currently in use.
Also note that port status for the Switch Port Module is
displayed directly on the module as described in the section on
Switch Port Module Indicator earlier in this chapter.
Link/Traffic
Color: Green
Function: Indicates port link and activity.
State Indication
ON Indicates a valid link has been established on this port.
OFF No valid link has been established on this port.
BLINKING Indicates that the port is receiving packets; blinking is proportional to the
traffic passing through the port.
Table 5.10 Link/Traffic
Link - The Link/Traffic LED should light up when a device (e.g.,
computer) establishes a valid connection via the RJ-45 port.
Troubleshooting - If the Link/Traffic LED does not light up when a device
is connected to a port, check that both the hub and connected device
are powered on. For devices connected to the hub using twisted-pair
cable, check that the cable length does not exceed 100 meters. You
should use standard, straight-through cables and not crossover or other
specialized cables.
Traffic
- Refers to the movement of packets received by the port.
A port’s
Link/Traffic LED will blink in proportion to the amount of