Network Router User Manual
Table Of Contents
- Rules for Adding a DAX Connection
- Rules for Adding Three-Segment Connections
- Rules for Adding Management Connections
- BPX 8600-to-BPX 8600 Segment
- Very High Speed Frame Service Modules
- Eight-Port Channelized and Unchannelized Frame Service Module
- Four-Port Unchannelized Frame Service Module for V.35
- MGX-FRSM-2CT3 Features
- MGX-FRSM-2T3E3 Features
- MGX-FRSM-HS2/B Features
- MGX-FRSM-HS1/B Features
- Eight-Port FRSM Features
- Congestion Indication for NIW Connections
- PVC Status Management
- Cell Loss Priority
- Congestion Indication
- Command and Response Mapping
- Translation and Transparent Modes
- Loss Priority Indication
- Congestion Indication
- Cell Delay Treatment
- Error and Alarm Response
- Configuring the Card, Lines, and Ports
- Adding and Modifying Connections
- Configuring the Card, Lines, and Ports
- Configuring Bulk Distribution and Redundancy
- Adding and Modifying Connections
- Configuring Redundancy Through the Redundancy Bus
- Configuring Redundancy Through the Distribution Bus
- Pattern Test Options
- Loopback Test Options
Card and Service Configuration 6-35
Bit Error Rate Testing on an Unchannelized T3 or E3 FRSM
• addchanloop and delchanloop are standard user commands for looping on a channel.
• tstcon checks the integrity of a connection.
• tstdelay measures the round trip delay on a connection.
Bit Error Rate Testing on an Unchannelized T3 or E3 FRSM
The MGX 8850 switch can perform a bit error rate test (BERT) on one active line at a time on the
MGX-FRSM-2T3 or MGX-FRSM-2E3. This type of testing disrupts service because it requires the
tested path to be in loopback mode. You can configure a BERT session and perform related tasks
through the CiscoView application or the CLI.
The MGX 8850 bus structure supports one BERT session per upper or lower bay of the card cage,
so the switch can run a maximum of two sessions at once. When you specify the target slot through
the CiscoView application or the acqdsx3bert command on the CLI, the system determines if a
BERT configuration already exists in the bay that has the specified slot. If no BERT configuration
exists in the bay, the display presents a menu for the BERT parameters.
The CLI commands (whose functions correspond to CiscoView selections) are:
• acqdsx3bert to determine if other BERT sessions exist in the bay
• cnfdsx3bert to specify a pattern for the BERT test
• startdsx3bert to start a BERT test (after resetting BERT counters)
• moddsx3bert to inject multi-rate errors into the BERT bit stream
• dspdsx3bert to display the parameters and results of the current test
• deldsx3bert to end the current test (and retain the values in the BERT counters)
See the Cisco MGX 8850 Wide Area Edge Switch 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).