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Transition Networks Section Vl: FBRM/BFFG Software Features
Software feature descriptions, continued
Table 3: Device Software Configurable Feature (continued)
Feature Description
Full Duplex In a full-duplex network, maximum cable lengths are
determined by the cable type. See the Cable
Specifications section for the different FBRM and BFFG
models.
The 512-Bit Rule does not apply in a full-duplex
network.
Auto firmware upgrade enable/disable:
In some cases, there may not be a requirement for
automatic firmware upgrades. For example, one might
connect a remote peer Device with the latest firmware
version before upgrading the local peer Device.
Typically, the local peer Device would detect a different
firmware version and will downgrade the firmware on
the remote peer Device. To prevent this, disable
automatic upgrade on the remote peer Device. The
remote peer Device will reject all upgrade requests from
the local peer Device—you can then upgrade the local
Device.
Firmware upgrades
(bootloader)
Force upgrade:
This is used to force a firmware upgrade on the remote
peer Device when the auto-upgrade feature is disabled on
the remote peer Device. This gives the local peer Device
authority to override the auto-upgrade feature of its
remote peer Device.
Half Duplex In a half-duplex network, the maximum cable lengths are
determined by the round trip delay limitations of each
Fast Ethernet collision domain. (A collision domain is
the longest path between any two terminal Devices, e.g.,
terminal, switch, or router.)
The 512-Bit Rule determines the maximum length of
cable permitted by calculating the round-trip delay in bit-
times (BT) of a particular collision domain. If the result
is less than or equal to 512 BT, the path is good.
For more information on the 512-Bit Rule, see the white
paper titled “Collision Domains” on Transition
Networks’ website at: www.transition.com
Continued on next page
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