Cabletron Systems FlowPoint 2100 12, User Manual

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Introduction

or full duplex mode. Operating in standard Ethernet mode limits bandwidth to 10 
Mbps per port, while operating in duplex mode doubles bandwidth from 10 
Mbps to 20 Mbps per port.

Management Information Base (MIB) Support

The 9E428-12/36 and 9E429-12/36 modules provide 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 9E428-12/36 and 9E429-12/36 modules attach 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 2.0 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.

Arbitration for the backplane is accomplished in the INB Time Division 
Multiplexing (ITDM) logic. The arbitration is a three-level scheme that ensures 
that no one can get the backplane for more than one time slice at a time.

The ITDM RAM contains 256 4-bit locations. This RAM is used to hold slot 
numbers of modules participating in INB backplane arbitration. The arbitration 
engine accesses this RAM once every time slice to get a slot number. That slot 
number will be granted access on the next time slice if it is requesting. The 
arbitration engine is always one time slice ahead, meaning that the value read 
from the RAM is for the next time slice, not the current time slice.

LANVIEW LEDs

The 9E428-12/36 and 9E429-12/36 modules use LANVIEW – the Cabletron 
Systems built-in visual diagnostic and status monitoring system. With LANVIEW 
LEDs, you can quickly identify, at a glance, system status, as well as the device, 
port, and physical layer status. Two LEDs indicate the transmission and reception 
of data from the INB SmartSwitch 9000 backplane connection. Each of the 12 
Ethernet front panel ports features two LEDs per port to indicate the port’s 
Administrative status (enabled/disabled), LINK status (Link/Nolink), and Data 
Activity (receiving and transmitting data).

For a complete list of supported MIBs, refer to the release notes provided in the 
9E428-12/36 and 9E429-12/36 modules package. 

NOTE