Cabletron Systems SEHI-22FL - Manual (Page 13)

Chapter 2: SEHI Features and Options
2-2 SEHI User’s Guide
2.1 SEHI OVERVIEW
The SEHI-22FL is an intelligent repeating hub providing front panel ports
for network connections and a rear panel HubSTACK Interconnect Bus
port for stackable connections. The SEHI is designed to manage the
Cabletron Systems SEH series of non-intelligent stackable hubs.
The SEHI-22FL provides twelve 10BASE-FL ST-type fiber optic ports
and one EPIM (Ethernet Port Interface Module) port.
2.2 SEHI FEATURES
This section provides detailed information about SEHI features and
capabilities.
Repeater Functionality
The SEHI fully conforms to the IEEE 802.3 10BASE-FL specifications,
and provides the flexibility to connect networks using IEEE 802.3,
Ethernet Version 1 or Version 2 equipment. The SEHI transmits retimed
data packets, regenerates the preamble, extends fragments, and arbitrates
collisions.
The SEHI automatically partitions problem segments, and reconnects
repaired segments to the network. This feature minimizes the impact on
network operation resulting from a problem on one segment by isolating
the problem segment. Only devices on the problem segment are affected.
When the problem is solved, the SEHI automatically reconnects the
isolated segment to the network.
FLASH EEPROMs
The SEHI uses FLASH EEPROMs that allow the downloading of new
and updated firmware using Cabletron Systems SPECTRUM Element
Manager/Windows or any device using BOOTP or TFTP protocols.
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
conveniently located on the SEHI front panel.
SEHI Book Page 2 Friday, April 19, 1996 10:46 AM