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Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter 6 Card and Service Configuration
Eight-Port Circuit Emulation Service Modules
• max_cost is a number establishing the maximum cost of the connection route. The range is 1–255
and is meaningful only in relation to the cost of other connections.
• restrict_trunk_type is a number that specifies the type of trunk this connection can traverse. The
numbers are 1 for no restriction, 2 for terrestrial trunk only, and 3 for satellite trunk only.
• pcr is the peak cell rate in cells per second (cps). For T3, the maximum is 118980 cps. For E3, the
maximum is 91405 cps.
• mcr is the minimum cell rate. The range is 1–65535 cells per second.
• pct_util is the percent utilization in the range 1–100.
Bit Error Rate Testing on a T3 or E3 CESM
An active MGX-CESM-T3 or MGX-CESM-E3 can perform a bit error rate test (BERT). Each of these
cards contains its own BERT controller, so BERT sessions can run on any number of these cards in the
system. However, only one user at a time can run BERT on a card. BERT disrupts service because it
requires the tested path to be in loopback mode.
The CLI commands (whose functions correspond to CiscoView selections) appear in the following list.
The correct order of task execution is crucial for obtaining valid results. With the exception of
dspdsx3bert, you must execute the commands in the order they appear in the following list. You can
execute dspdsx3bert before, during, or after a session. Because the order of execution is crucial, read
the command descriptions whether you use the CiscoView application or the CLI.
1. acqdsx3bert determines if another user currently is running a BERT session on the card.
2. startdsx3bert starts a BERT test (after resetting BERT counters).
3. cnfdsx3bert specifies a pattern for the BERT test.
4. moddsx3bert injects multi-rate errors into the BERT bit stream.
5. deldsx3bert ends the current test (and retains the values in the BERT counters). This command also
resets the status of current users that acqdsx3bert detects.
6. dspdsx3bert displays the parameters and results of the current test. You can execute this command
at any time.
See the Cisco MGX 8000 Series Command Reference for command details.
Note When a BERT session begins, all the connections on the line go into alarm and return to normal when
you end the test. Consequently, the test may result in a large number of traps and other types of traffic
(such as AIS).
Eight-Port Circuit Emulation Service Modules
The main function of the Circuit Emulation Service Module (CESM) is to provide a constant bit rate
(CBR) circuit emulation service by converting data streams into CBR AAL1 cells for transport across
an ATM network. The CESM supports the CES-IS specifications of the ATM Forum.