Specifications

3-8
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 3 Preparing AXSM Cards and Lines for Communication
Selecting and Viewing Service Class Templates
you do not need to (re)configure the switch. The parameters in the SCTs define generic thresholds and
priorities of queues that can be understood without having to go through the programming details of
Queuing engines, such as QE48 (in AXSMs) or QE1210 (in AXSME).
SCT files include the following types of configuration data:
• general link parameters
• COSB parameters
• virtual circuit threshold parameters
• COSB threshold parameters
SCT files are applicable to AXSM, AXSME, FRSM12, and PXM1E cards. Each card-type has its own
unique port SCT and card SCT. Card SCTs define traffic parameters between a specified card and other
like cards in the switch. Port SCTs define traffic parameters on a single line or port. You can apply the
same SCT to multiple cards or ports.
Port SCTs are classified as policing or non-policing. Typically, policing SCTs are used on UNI ports at
the edge of the ATM network and control traffic entering the network. Non-policing SCTs are typically
on trunk ports that interconnect switches within the network. Cisco provides default port SCT files with
and without policing capability.
Note The policing parameters in a card SCT are ignored.
Note If traffic is properly controlled at the edges of an ATM network, there should be no need for policing
within the network.
Each SCT is uniquely identified by its name, which is in the following format:
<service_module_name>_<PORT|CARD>.<SCT_ID>.V<major_version>
For example, an AXSME SCT file name might look as follows: AXSME_SCT.CARD.5.V1
Table 3-1 describes the parameters used in the SCT naming convention.
To enable ATM communications, you must assign a card SCT to every AXSM, PXM1E, and/or FRSM
card in your network, and you must assign a port SCT to every port you use. The SCT files are stored in
the F:\SCT\<card type> directory. For example, AXSM SCTs will be stored in the F:\SCT\AXSM
directory.
Table 3-1 SCT Naming Conventions
Parameter Description
service_module_name The name of the service module on which the SCT
will be applied. The possible service modules are
AXSM, AXSME, PXM1E, and FRSM12.
PORT|CARD Specifies whether this is a port SCT or a card SCT.
SCT_ID A 16-bit number uniquely identifying the SCT.
V<major_version> A 16-bit number which identifies the major
version of the SCT. The major version of the SCT
changes whenever a new object is added or
deprecated in the SCT MIB.