User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 7-39

Diagnostics & Troubleshooting

Testing DS3 Redundancy

 Testing Electronics Protection ... 7-39

 Testing Electronics and Network Protection ... 7-42

Testing Electronics Protection

 DS3 Test Setup ... 7-39

 DS3 Manual Switch Test ... 7-40

 DS3 Automatic Protection Test ... 7-40

 DS3 Revertive Switching Test ... 7-41

This test requires two Controller cards that are capable of operating correctly.

NOTE: If you are testing with a Telnet session, each time you switch Controllers (switch

command), you will have to reconnect your Telnet session to the Wide Bank IP address.

DS3 Test Setup

1. Configure all of the DS1s for B8ZS line coding (E1 circuits must be configured for HDB3), and

both DS3s for M23 framing and DS3 electronic redundancy. Configuring for DS3 electronic

redundancy means having two Controller cards that operate correctly, arm turned on (arm on),

and ds3 network protection turned off (ds3 protect off).

Configure all DS1s for B8ZS line coding (E1 for HDB3):

(A:Active)> ds1 all linecode B8ZS

Configure both DS3s for M23 framing:

(A:Active)> ds3 framing m23

Configure for DS3 electronic redundancy only:

(A:Active)> ds3 protect off

2. Loop the DS3 back on itself (transmit to receive with 75 ohm BNC cable).

3. Send PRBS pattern across the low-speed circuit using the test set.

4. Verify that the test set synchronizes on its own pattern on the low-speed link.