User manual Cabletron Systems 24

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Autom a tic Be a c on Re c ove ry Proc e ss  
wrong ring speed. If a ring speed mismatch is detected, the STH disables  
the port to keep the misconfigured station isolated from the ring and  
provides a simple visible LED signal (blinking red at the port’s LED) to  
indicate to the user that Speed Fault Protection has disabled the port. The  
port remains disabled until the ring speed mismatch condition is  
removed or resolved.  
Ac tive Circ uitry  
On each TCU port, STH hubs provide active circuitry which filters,  
equalizes, and amplifies all received signals before transmitting them to  
the next point on the ring. The result is enhanced signal integrity and  
extended maximum station lobe cable distances.  
Da ug hte r Boa rd Up g ra d e Kit  
Both the STH-22 and the STH-42 can be upgraded to 24 ports using the  
following daughter board upgrade kits:  
TR-UTP-UGKT for STH-22.  
TR-STP-UGKT for STH-42.  
.2.3 Autom a tic Be a c on Re c ove ry Proc e ss  
To guard against interruptions in network operations due to beaconing  
conditions, the STH supports Cabletron Systems’ advanced Automatic  
Beacon Recovery Process which automatically partitions problematic  
lobes from the ring, allowing the rest of the ring to continue operating.  
ABRP engages even before the IEEE standard beacon recovery process  
begins and is able to treat conditions beyond the scope of the IEEE  
process.) It is the stack’s intelligent hub that actually executes the ABRP  
algorithm. The intelligent hub also checks partitioned lobes periodically  
and re-enables them automatically once they have recovered.  
.2.4 Sup p ort for Pa ssive MAU Workg roup s  
Whereas a station signals a TCU to open its interface by sending a  
phantom current down its lobe cable, a passive Multi-Station Access Unit  
can not provide phantom current. A TCU Ring Out port is therefore  
configured to ignore the absence of phantom current in the connecting  
cable and to look instead for the presence of data bits to determine link  
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