Cisco 7300-6T3 User Manual download pdf (Page 52)

4-16

Clear Channel 6-Port T3 (DS3) Line Card Installation and Configuration

OL-3449-02

Chapter 4 Configuring the 6T3 Line Card

Checking the Configuration

Figure 4-1 shows the data flow for three loopback configuration paths, including no loopback.

Figure 4-1 DS3 Loopback Paths

loopback network payload Sets the interface into network payload

loopback mode. Network payload

loopback loops just the payload data back

toward the network at the T3 framer.

Router(config)# interface serial 2/0

Router(config-if)# loopback network

payload

loopback remote

Sets the interface into remote loopback

mode. Remote loopback loops the data

back toward the network (before the

framer at the remote T3 device).

Router(config)# interface serial 2/0

Router(config-if)# loopback remote

loopback dte Sets the interface into loopback data

terminal equipment (DTE). Loopback

DTE loops the router output data back

toward the router (after the LIU).

Router(config)# interface serial 2/0

Router(config-if)# loopback dte

1. Remote loopback mode works with C-bit framing only. The other loopback modes listed above work with C-bit and M23 framing. Refer to the

“Specifying T3 Framing” section on page 4-9 for information on configuring C-bit framing.

Table 4-8 Using loopback Commands (continued)

Command Function Example

QJET

695

No loopbacks

DTE loopback

Tx/Rx

HDLC

Diagnostic or local loopback

Line loopback Payload loopback

LIU

Tx DS3 framer

Rx DS3 framer

QJET

Tx/Rx

HDLC

LIU

Tx DS3 framer

Rx DS3 framer

QJET

Tx/Rx

HDLC

LIU

Tx DS3 framer

Rx DS3 framer

QJET

Tx/Rx

HDLC

LIU

Tx DS3 framer

Rx DS3 framer

QJET

Tx/Rx

HDLC

LIU

Tx DS3 framer

Rx DS3 framer

Remote loopback

Cable

Remote

host

QJETLIU

Rx DS3 framer

Tx DS3 framer

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