3Com 3C16670 - LinkBuilder FMS II Hub Configuration Manual page 9

Bridged Token Ring with LinkBuilder MSH
Highlights
The LinkBuilder MSH Token Ring
modules provide an array of Token
Ring physical layer resilience fea-
tures unmatched in the industry.
Phase-Locked Loop (PLL) per-port
retiming, Zero Delay Lockout (ZDL),
and jitter reduction ensure a clean
signal and prevent beaconing nodes.
These features ensure greater relia-
bility across Token Ring networks,
support more devices over greater
distances, and ensure that devices do
not interrupt the network by insert-
ing into the ring at the wrong speed.
This solution exploits the
LinkBuilder MSH hub's ability to
handle multiple Token Ring paths
running at 4 or 16 Mbps. The addi-
tion of a second RingBuilder
®
2-Port Bridge
Module
RI/RO to 4 Mbps
Token Ring backbone
module allows the MAUs to be
divided into two Token Rings. The
Local Token Ring Bridge module
provides fully integrated bridging
between those rings—in this case,
between a 4 Mbps ring and the
16 Mbps imaging system ring.
Products
LinkBuilder MSH Chassis with FDDI
Backplane (3C18041)
LinkBuilder MSH 525W Power Supply Unit
(3C18012)
LinkBuilder MSH Fiber RingBuilder
Modules (3C18240)
LinkBuilder MSH Advanced MAU Module
(3C18202)
LinkBuilder MSH 2-Port Token Ring Bridge
Module (3C18620)
LinkBuilder MSH Management Module
(3C18500)
™
Token Ring
path connections
Advanced MAU Modules
RingBuilder
Modules
Configuring the
LinkBuilder MSH
in a Token Ring
Environment
Use the following rules to configure
the LinkBuilder MSH for Token Ring.
• The Advanced MAU module
does not count as a station.
• The STP or UTP MAU module
counts as one station.
• The STP or Fiber RingBuilder
module counts as three stations.
• The maximum Level 5 UTP
cable lengths for the Advanced
MAU module are:
400 m lobes, 260 stations (4 Mbps)
200 m lobes, 260 stations (16 Mbps)
• The maximum STP cable
lengths for the Advanced MAU
module are:
600 m lobes, 260 stations (4 Mbps)
300 m lobes, 260 stations (16 Mbps)
• The maximum STP trunk cable
lengths for the RingBuilder
RI/RO are:
770 meters (4 Mbps)
346 meters (16 Mbps)
• The maximum UTP trunk cable
lengths for the RingBuilder
RI/RO, when used in conjunction
with approved media filters, are:
4 Mbps Token Ring
100 meters for Level 3 UTP
150 meters for Level 4 UTP
16 Mbps Token Ring
for document imaging
200 meters for Level 5 UTP
system
7
LinkBuilder Hub Configuration Guide