METRObility Optical Systems 8124-01-M - Manual (Page 24)

24 CenturyStack 8100 Managed Hub
Backpressure (flow control)
When packets are passed from 100Mbps segments to 10Mbps segments
the flow is restricted due to the lesser capacity of the 10Mbps segment
causing backpressure and resulting in dropped packets. With flow control
or backpressure enabled, packets are made to wait until the flow is
unrestricted before being sent, reducing the number of dropped packets.
Installing a Bridge Module
Power down CenturyStack before installing a bridge module. Bridge
modules have both hardware and software configuration settings. The
hardware configurations must be made before you physically install the
module and the software configurations must be made using a master hub,
after the module is installed and before the bridging functions take effect.
Please read this section carefully before installing modules.
IMPORTANT:
• These modules are not hot swappable. You must remove
power from the hub before installing or replacing a
bridge module.
• You should enable the internal bridge on only one bridge
module when you have multiple bridge modules installed
in a CenturyStack. This prevents a network loop
condition.
• Three bridge modules are shipped with the Internal
Bridge function enabled (8102-01-X, 8103-01-X and
8103-03-X), only the 8102-03-X is shipped with the
Internal Bridge function disabled. All models ship with
the backpressure function disabled.
To install these modules, perform the following steps. Use static sensitive
precautions.
1. Set the bridge function and backpressure function by moving
the appropriate jumpers. See the following sections for the
bridge module model that you are installing and set the
jumpers accordingly.