Carrier Access Access Navigator user manual DS1 Line Loopback, DS1 Payload Loopback

Diagnostics & Troubleshooting

DS1 Line Loopback

DS1 Line Loopback

Provides a line loopback to verify that the DS1 signal is reaching the Access Navigator’s Quad T1 Framer card. The line loopup command creates a connection inside the Line Interface Unit (LIU), causing it to loop the DS1 receive (input) back to the transmit (output). See Figure 15-4.

Syntax: set ds1 <n> line <loopdownloopup>

		IN		Quad T1 Framer Card
				Line
DS1	OUT		Interface		Framer
				Unit

Time Slot

Interchange

Figure 15-4 DS1 Line Loopback

DS1 Payload Loopback

Provides a payload loopback to verify DS1 signal processing in the Quad T1 Framer card. The payload loopup command creates a signal connection inside the framer, causing it to loop the received payload data back into the framer, where the 24 DS0s are reframed as the DS1 transmit output. See Figure 15-5.

Syntax: set ds1 <n> payload <loopdownloopup>

Quad T1 Framer Card

DS1

IN

OUT

Line

Interface

Unit

Framer

Time Slot

Interchange

Figure 15-5. DS1 Payload Loopback

15-30 August 2003 Access Navigator - Release 1.8