3Com DUA1800-0AAA04 Chassis.bk : CHAPTER3 Page 10 Monday, February 10, 1997 1:11 PM

3-10 CHAPTER 3: INSTALLING MODULES INTO THE MSH CHASSIS
DUA1800-0AAA04
Token Ring Modules
The operation of 3Com token rings is described in Volume 3 of
the user guide that accompanies the MSH management module.
Token rings in the MSH chassis are built from two types of
module:
■Media Access Unit (MAU)
■RingBuilder module
Normally an internal token ring will have one RingBuilder and
several MAUs linked into it. These modules provide all the
standard functions within an 802.5 Token Ring network.
The MAU Module
The MAU module (available with UTP or STP connections)
provides connectivity for a number of ring-stations into an
internal token ring section. It provides the following functions:
■A physical and electrical connection of a token rin g-station to a
local ring section of a token ring network.
■Data rates of either 4 or 16 Mbps. It is possible to operate
separate 4 and 16 Mbps rings simultaneously in the same MSH
chassis.
■Basic insert and bypass functions, together with signal retiming
for the module.
■Port level insertion control capability when a management
module and an associated RingBuilder module are installed in the
MSH chassis. This incorporates the ability to enable or disable a
port, and provides an asynchronous method of notifying the
management software of any port status change.
■Supported lobe lengths of 100 meters at 4 Mbps, 100 meters at
16 Mbps assuming the use of high quality data grade cable.
Chassis.bk : CHAPTER3 Page 10 Monday, February 10, 1997 1:11 PM