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SEH FEATURES
SEH USER’S GUIDE
1-3
Stack up to five SEH hubs using Cabletron Systems external HubSTACK
Interconnect cables. Manage the stack by using the Cabletron Systems
MicroMMAC or SEHI (Stackable Ethernet Hub with Intelligence). Up to
four SEH hubs can be stacked with one intelligent hub. Stackable
configurations make it possible to maintain only one IEEE repeater hop
while providing up to 130 Ethernet ports.
1.4 SEH FEATURES
Repeater Functionality
The SEH fully conforms to the IEEE 802.3 Repeater, AUI, and
10BASE-T specifications, and provides the flexibility to connect
networks using IEEE 802.3, Ethernet Version 1 or Version 2 equipment.
The SEH transmits re-timed data packets, regenerates the preamble,
extends fragments, and arbitrates collisions.
The SEH automatically partitions problem segments, and reconnects
repaired segments to the network. This feature minimizes the impact on
network operation by isolating the problem segment. Only devices on the
problem segment are affected. When the problem is solved, the SEH
automatically reconnects the isolated segment to the network.
Polarity Detection and Correction
Each twisted pair port on the SEH incorporates a Polarity Detection and
Correction feature that allows the SEH to pass data regardless of the
polarity of the twisted pair segment’s receive link. Cabletron does not
recommend operating in this condition. When this condition is
discovered, remove the segment from the network and wire it correctly to
reduce the potential for problems if equipment changes are made.
LANVIEW LEDs
Cabletron Systems LANVIEW Status Monitoring and Diagnostics
System is a troubleshooting tool that helps in diagnosing power failures,
collisions, cable faults, and link problems. The LANVIEW LEDs are
located on the front panel.
SEH Book Page 3 Tuesday, March 19, 1996 4:12 PM