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Re la te d Ma nua ls  

By default, each of the STH hub’s TCU ports is configured to its STN  

station) setting to support concentrator lobe connections to stations.  

(

Through Local Management, any TCU port may be reconfigured to its  

RO (Ring Out) setting to support connections to passive MAU (Multi-  

Station Access Unit) workgroups.  

Im p rove d Prote c tion from Be a c oning  

The STH provides enhanced reliability for existing networks which use  

passive MAUs because Multiple Ring Out TCUs allow for the separate  

attachment of each MAU. Rather than daisy-chaining MAUs together as a  

single entity and risking their collective isolation in case of beaconing, the  

user can now attach each MAU individually, reducing the number of  

MAU ports that are at risk of collective isolation in case of beaconing on  

the ring; ABRP is able to bypass individually connected MAUs on an  

individual rather than collective basis. See Figure 1-2.  

No Conne c tion Re d und a nc y  

The STH hub’s Ring Out TCU configuration does not provide for the  

MAU’s redundant connection to the ring. In the common configuration, a  

MAU chain is dual-attached to the Token Ring LAN via both a Ring Out  

cable and a Ring In cable. Using a TCU port, however, each passive MAU  

workgroup is physically connected to the hub in the same manner as a  

station—by a single cable—and therefore is not provided a backup path  

between the MAU and the Token Ring network. Only the dual  

attachment of Ring In and Ring Out cables can provide a backup path.  

This level of connectivity must be provided by a dedicated pair of Ring In  

/

Ring Out ports such as those available on the intelligent hub.  

1

.3 Re la te d Ma nua ls  

Use the STHi User’s Guide (PN 9031390) and the MicroMMAC-xxT  

User’s Guide (PN 9031320) to supplement the procedures and other  

technical data provided in this manual.  

Page 1-5  

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