Specifications

Glossary–6
filtering
Filtering allows you to prevent, on per-port basis, a bridge from forwarding frames
specified by address or protocol.
flex(ible) channel
A technology independent high-bandwidth channel that can support FDDI, Ethernet,
Token Ring, or other interconnection needs. The DEChub 90 has one flex channel.
The DEChub 900 has one flex channel on the upper (48-pin connector) and twelve
flex channels (actually fourteen, because channels 11 and 12 are each segmented into
two distinct channels) on the lower (160 pin connector).
flow control
An access server port characteristic that allows an access server to start and stop data
transfer between the access server port and the attached device.
FOIRL
Fiber-optic inter-repeater link.
forwarding database (address forwarding database)
A table maintained by a bridge (see bridge) that contains station addresses, the port
on which the addresses are located, and the age of these entries. A bridge forwards or
filters frames based on the information in the forwarding database. A bridge creates
its forwarding database by “learning” the source line and source address of each
incoming frame.
frame
A group of digits (bits) transmitted as a unit, over which a coding procedure is
applied for synchronization. Frames are transmitted in packets on an Ethernet LAN.
FRU
Field replaceable unit.
full height module
A six-sided enclosure measuring approximately 1.73 inches x 17.5 inches x 6.0
inches. This module is installable in the DEChub 900, DEChub ONE, or DEChub
ONE-MX.