Introduction
1-4
INB
The 9H423-26 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 operate 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 9H423-26 module uses 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 24 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).
Summary of Contents for SmartSwitch 9000
Page 1: ...SmartSwitch 9000 9H423 26 User s Guide 9032242 02 ...
Page 2: ......
Page 30: ...Operation 3 10 ...
Page 34: ...LANVIEW LEDs 4 4 ...
Page 38: ...Specifications 5 4 ...