Cabletron Systems TRFMIM 28 TRFMIM-28, User Manual

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Introduction
negotiate duplex, both the 9H423-28 and the attached device must be configured
for auto-negotiation. If only the 9H423-28 is configured for auto-negotiation, the
module will set the connection to half duplex at either the 10 Mbps or 100 Mbps
rate. This technology is similar to how modems negotiate transmission speed,
finding the highest transmission rate possible. Similarly, auto-negotiation
determines the highest common speed between two devices and communicates at
that speed. If no common speed is detected, the device will be partitioned.
Standard Ethernet/Full Duplex Operation
The 9H423-28 module supports both 100BASE and 10BASE technology. This
allows each port on the module to be configured, through local and or remote
management (SNMP), to operate in standard Ethernet mode (simplex) or full
duplex mode. Operating in standard Ethernet mode limits bandwidth to 10
Mbps/100Mbps per port, while operating in duplex mode doubles bandwidth
from 10 Mbps/100Mbps to 20 Mbps/200 Mbps per port.
Management Information Base (MIB) Support
The 9H423-28 module provides MIB support including:
• RMON (RFC-1271)
• IETF MIB II (RFC-1213)
• IETF Bridge MIB (RFC-1493)
and a host of other Cabletron Enterprise MIBs.
INB
The 9H423-28 module attaches to INB-B of the SmartSwitch 9000 Backplane. The
INB Backplane is designed to transport fixed length data blocks between modules
in the SmartSwitch 9000 using an INB Time Division Multiplexing (ITDM) design.
The SmartSwitch 9000 INB bus delivers 2.5 Gbps of true data bandwidth with all
control and management communication being serviced on the 8-bit out-of-band
bus. The time slices of the INB manager operates in all three modes at once,
without user intervention.
All RJ45 connections are capable of auto-negotiation, and can operate at 10 Mbps
or 100 Mbps, full or half duplex. Fiber connections can only operate at the 100
Mbps rate, full or half duplex.
NOTE
For a complete list of supported MIBs, refer to the release notes provided with the
9H423-28.
NOTE