Networks With Access Feeders Or Access Concentrators - Cisco OL-10426-01 User Manual

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Networks with Access Feeders or Access Concentrators

IPX and IGX switches can include devices that do the following tasks:
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The NMT supports three access feeders that concentrate or convert data: the MC3810, the FastPAD, and
the Port Concentrator. One IGX or IPX node can support up to 64 of these devices. Using NMT to model
connections that terminate on these access feeders is similar to modeling MGX 8220 feeders for a tiered
network.
MC3810
The NMT supports the MC3810 configured as a feeder to an IGX switch. The MC3810 concentrates
voice and data connections into Frame Relay connections. The NMT configures as many MC3810s as
are required to support the traffic. The NMT generally sets the feeder trunk speed to the minimum speed
that can carry the traffic.
The NMT designs MC3810s automatically when MC3810 connections are added to the Voice Traffic,
Data Traffic, or Bursty Traffic table, and the model is based on switch software release versions 8.2.5 to
8.3.9, or 8.5.0 and above.
Refer to
Table 4-21 MC3810 Configuration
Topic Required Settings
Setting MC3810 Model Settings table
Release
Make sure that the value of Switch Software Release is set to the release that
is to be modeled. If that value is one that defaults to MC3810 (825 to 839, or
850 and above), NMT will design MC3810s for any non-voice feeder
connections. All other values default to FastPAD for non-voice feeder
connections.
Adding MC3810 data Data Traffic table
connections
Type field: Enter the data traffic speed. If the speed exceeds 512 Kbps, do not
use the Data Traffic table; use the Bursty Traffic table instead.
BC (Back Card) field: For each end of the connection, enter the back card of
the FTC/ FTM card that links the hub IPX/IGX switch to the MC3810 (T1,
E1, V, or X).
Fdr BC (Feeder Back Card) field: Enter the connection interface on the line
side of the MC3810.
Adding MC3810 Voice Traffic table
dedicated voice
Type field: Enter C32, A32, G729, G729V, G729A, or G729AV. The types
connections
refer to compression algorithms; all G types are 8 kbps.
BC (Back Card) field: For the MC3810 end of the connection, enter the back
card of the FTC/FTM card that links the hub IPX/IGX switch to the MC3810
(T1, E1, V, or X).
Fdr BC (Feeder Back Card) field: For each end of the connection having a
MC3810, enter V for analog voice, or T1 or E1 for digital voice.
Cisco WAN Modeling Tools Guide
4-36
concentrate small connections into large ones
convert normal voice or legacy data connections into Frame Relay connections.
Table 4-21 for information on modeling a network using the MC3810.
Chapter 4 Configuration Tables and Fields
Comments
If the NMT default value (920) is
used, NMT will automatically design
MC3810s for all feeder connections,
except for voice connection types that
are exclusively for FastPad.
Each MC3810 data connection must
originate and terminate on a MC3810.
If the switch software release does not
support the MC3810, NMT designs
FastPADs.
The minimum speed for synch data is
19.2 kbps. For legacy data like
HDLC, use the Bursty Traffic table.
MC3810 dedicated voice connections
can have one end at a MC3810 and
the other at a CDP, CVM, or UVM
card at an IPX or IGX switch.
For each feeder back card entry, the
NMT establishes a dedicated virtual
circuit that connects one voice port on
a MC3810 to one voice port on
another MC3810 or on an IPX/IGX
switch.
OL-10426-01, Rev. A0