Specifications

3.11 Token Ring
Network Modules 3–95
3.11.1 DECmau 900TH
The DECmau 900TH is an intelligent Token Ring Multistation Access Unit (MAU)
that is fully compatible with the IEEE 802.5 standard and IBM Token Ring
environments.
The module is designed to support both 4 MB/s and 16 MB/s ring speeds, and
provides 24 lobe ports for a star-wired topology. It accommodates 100-ohm shielded
twisted-pair and unshielded-twisted-pair cabling using shielded 8-pin MJ connectors
and IBM-type data connectors using BN26T cable adapters.
The DECmau 900TH also provides solutions such as automatic speed detection and
wrapping. Automatic speed detection allows stations to insert into a ring only if it is
at the same ring speed. Automatic ring wrapping maintains ring integrity in case of
device or cable failure. Figure 3–30 shows the DECmau 900TH network module.
Figure 3–30 DECmau 900TH
Platform
This full-height module is used in the DEChub 900 MultiSwitch, DEChub ONE, and
DEChub ONE-MX.
DECswitch 900ET
LKG-10284-96F