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PA-MC-T3-EC Port Adapter Installation and Configuration
OL-10589-02
Chapter 4 Configuring the Unchannelized Mode
Configuring an Unchannelized T3 Link
Shutting Down the T3 Controller
You can shut down the T3 controller on the PA-MC-T3-EC with the
shutdown
controller comman.:
This command sends a DS3 idle signal toward the network. You can bring the T3 controller back up with
the
no shutdown
controller command.
The example that follows is for a port adapter in slot 1 of a Cisco 7200 VXR router:
Router(config)#
controller T3 1/0
Router(config-controller)#
shutdown
Configuring a BER Test on the T3 Controller
Bit error rate test (BERT) circuitry is built into the PA-MC-T3-EC. With BER tests, you can test cable
and signal problems in the field.
There are two categories of test patterns that can be generated by the onboard BER test circuitry:
pseudorandom and repetitive. The former test patterns are polynomial based numbers and conform to
the CCITT/ITU O.151 and O.153 specifications; the latter test patterns are zeros or ones, or alternating
zeros and ones.
A list of the available test patterns follows:
•
Pseudorandom test patterns:
–
2^15 (per CCITT/ITU O.151)
–
2^20 (per CCITT/ITU O.151 non-QRSS)
–
2^23 (per CCITT/ITU O.151)
•
Repetitive test patterns:
–
All zeros (0s)
–
All ones (1s)
–
Alternating zeros (0s) and ones (1s)
Both the total number of error bits received and the total number of bits received are available for
analysis. You can set the testing period from 1 minute to 14,400 minutes (240 hours), and you can also
retrieve the error statistics anytime during the BER test.
When running a BER test, your system expects to receive the same pattern that it is transmitting. To
accomplish this, two common options are available:
•
Use a loopback somewhere in the link or network.
•
Configure remote testing equipment to transmit the same BER test pattern at the same time.