Installation manual

Fast EtherHub-8se User’s Guide
4-4 Hardware Reference
The Collision LEDs assist the network manager in monitoring the percentage of
packet collisions occurring relative to the total packets transmitted by the hub.
When collisions reach a level marked on the front panel display, the correspond-
ing LED lights up. For example, if packet collisions reach 1%, the LED labeled
1% will light up. However, if collisions go beyond 1% (e.g., 15%), the LED
labeled 15
+
% and all the other LEDs before it (i.e., 1, 3, 5 and 10) also light up
in rapid succession.
Note: If the hub displays a high collision rate, check to see if any of the connected
devices are malfunctioning or if a loop has been formed in your network connections.
Otherwise, you may need to reconfigure your network to balance the traffic load.
Port Status Display
Partition Status
Color: Orange
Label:
Partition
Function: Shows if the port has been isolated from the network
Condition Indication
ON
Indicates port has been partitioned due to an abnormal network condition.
OFF Port is in good condition.
A port is temporarily partitioned when a line error or too many collisions are
detected on the attached segment. While it is automatically partitioned, the
port continues to receive data from the segment. However, data is not
transmitted onto the segment. When the problem is corrected or a valid data
packet is received through the port, the port is automatically reconnected.
When partitioning occurs, the port’s corresponding Partition LED will be
continually lit (RED light). Otherwise, this LED should be OFF (unlit).
Note:
When a long run of collisions occur on the cable connected to a hub port (i.e.,
64 collisions), that port is automatically partitioned by the hub. It is automatically
reconnected when a collision-free data packet at least 512 bits long (i.e., a
minimum size legal packet) passes through the port.