16
User Guide
Factory Settings
Two functional settings on the Radiance 10/100Mbps interface line card are
preset and cannot be changed. Another setting, which controls the backpressure
function, can be modified via management software after the card is installed
and connected to the network. Refer to the Command Line Interface Reference
Guide, NetBeacon Element Management Software Installation and User’s Guide
or WebBeacon Management Software Installation and User’s Guide for detailed
software instructions.
Backpressure
For ports operating at half duplex, you have the option of enabling the
backpressure function. When backpressure is activated, the line card generates a
jamming pattern to force a collision on a port if the line card cannot allocate a
buffer for the port’s incoming packets. Activating backpressure enables it for
both ports. Backpressure is ignored in full duplex because collisions are not
generated in this mode. The default setting is disabled.
1522 Enable
The line card is preset to pass up to 1522-byte packets, which are used as VLAN
tags, through both ports. Packets that are too small (less than 64 bytes) or too
large (more than 1522 bytes) are discarded. This setting cannot be modified.
Back-Off
Packet transmission is attempted 16 consecutive times before the 10/100Mbps
interface line card restarts its back-off algorithm. After the back-off period ends,
the card again tries to send the packet up to 16 consecutive times. A packet
which endlessly fails to be sent will continue to be retransmitted forever, only
changing back-off intervals.
