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8237 Hub Installation and Planning Guide
Features
All 8237 models include these features:
•
Sixteen 10BASE-T ports with shielded RJ-45 connectors that support the IEEE
802.3 10BASE-T specification.
•
All of the 10BASE-T ports are Medium Dependent Interface-X (MDI-X) ports.
These ports perform an internal crossover function that allows easy connection
to other devices using standard cables.
•
The sixteenth port is also accessible without the internal crossover function, at
the port marked "16-MDI," permitting connection to devices having an internal
crossover function using standard straight-through cables.
•
A front-panel Expansion Port slot to accommodate an optional, slide-in Media
Expansion Port, or Fast Expansion Module, for connecting to AUI, 10BASE2,
10BASE-FL, FOIRL, 10BASE-T/100BASE-TX, or 100BASE-FX networks.
•
Three independent 10-Mbps Ethernet backplanes.
•
EtherWatch LED bars to display hub utilization and collision rates.
•
Repeating of all Ethernet frame formats.
•
Auto-partitioning and reconnecting of ports whose attached devices create
excessive collisions.
•
Jabber protection by disabling a port that receives 65 536 bits of continuous
transmission and re-enabling the port when the condition clears.
•
A serial management port for configuring the 8237 and upgrading microcode via
Xmodem download.
•
LEDs that indicate link status, activity, and partition status at the port level.
•
Storage of vital configuration data in nonvolatile memory.
•
Intrusion prevention: The 8237 can be configured to issue warnings or disable a
port automatically when frames are received at that port from any MAC address
other than the one authorized to send to that port.
•
Eavesdropping protection: The 8237 can be configured so that a port will repeat
packets with scrambled data if the destination address does not match the Last
Source Address for that port.
•
Can be mounted in an EIA standard 19-inch rack (mounting brackets included).
The 8237 can also be placed on a tabletop or shelf.
•
Up to ten 8237s in any combination of models can be configured in a stack.
Model 002 provides these additional features to the entire stack:
•
An SNMP agent that provides support for these Management Information
Bases (MIBs):
- RFC 1213 (MIB II)
- RFC 1516 (SNMP repeater MIB)
- RFC 1643 (Ethernet MIB)
- Novell Hub MIB
- IBM private MIB (listed in Appendix B).
Summary of Contents for 8237
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