
Cisco IOS SoftwareConfiguration for theCisco 12000 SeriesOne-Port Channelized OC-12/STM-4(DS1/E1) ISE Line
How to Configure Layer 1 Features
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Cisco IOS Release 12.0(27)S1
Configuring T1 Lines Under SONET Framing
With SONET framing, you can configure T1s in vt-15 or in ct3 mode.
Procedures and examples for configuring T1 channel-groups on the 1-Port CHOC-12 ISE line card are
presented in the following sections:
• Configuring a T1 in SONET Virtural Tributary Mode, page 15
• Configuring a T1 in SONET CT3 Mode, page 16
• Removing a Logical Channel Group from a T1 Line, page 18
• Using the ping Command to Verify Network Connectivity, page 18
• Using T1 Interface Loopback Modes, page 28
• Configuring a BER Test on a T1 Line, page 21
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