Installation guide

3
MMAC-Plus Installation Guide
System Management Bus 10
The System Management Bus 10, or SMB-10, performs similar functions to those
of the SMB-1 previously discussed in this section. The SMB-10 bus is devoted to
the transfer of management data within the chassis, but is used for out-of-band or
Local Management operations. The SMB-10 operates at Ethernet speeds of
10 Mbps, and is connected to any manageable module in the chassis. Access to the
SMB-10 for Local Management operations is provided through an Ethernet Port
Interface Module (EPIM) slot on the 9C300 Environmental Module, or through
the serial COM ports, also located on the Environmental Module. The SMB-10 can
also be accessed from in-band management through a Telnet application.
The Flexible Network Buses
The Flexible Network Buses, FNB-1 and FNB-2, are the primary backplane buses
used to connect MMAC-Plus modules for shared network designs. Each FNB bus
operates as a dual, counterrotating Fiber Distributed Data Interface (FDDI) ring.
Each FNB bus operates at 100 Mbps, and consists of one primary ring and its
associated secondary ring. In the event of a failure of a station or a connection, the
signals from the primary ring are wrapped onto the secondary ring, creating a
single ring and allowing network traffic to continue circulating. The construction
of the FNB backplanes includes shunting connectors which allow network signals
to pass by unpopulated slots in the chassis. This design frees Network Managers
from a dependence on specific ordering or placement of modules, and allows
modules to be removed from the FNB without causing a wrap of the FDDI ring.
The Internal Network Buses
The Internal Network Buses, abbreviated INB-1 and INB-2, are designed to
simultaneously support both packet and ATM cell transport. Each INB data
channel is 64 bits wide (56 byte data bus and 8 byte management and control bus)
and runs at a clock rate of 40 mhz, yielding a sustained data rate of 2 Gbps, and a
burst rate of 2.5 Gbps. The 8 byte management and control bus allows all
signaling and bus arbitration functions to occur out-of-band with regard to user
data.
The Cell Transfer Matrix (installed in the 9C714 chassis only)
The Cell Transfer Matrix provides a Time Division Multiplexed (TDM) based
mesh of full duplex, high speed (1.6 Gbps) dedicated interconnections capable of
carrying standard ATM cell traffic. These interconnections are a series of point-to-
point links between an individual module, and every other module that directly
connects to the Cell Transfer Matrix. If the 9C714 chassis has 14 modules that
connect to the CTM installed, there are 182 point-to-point links between all the
modules, providing a total aggregrate switching capacity of 75 Gbps.