Carrier Access SNMP manual Receiving DS-1 CSU Loopback, Sending DS-1 CSU Loopback

Illustrations of Loops and Self-Tests

12.9.6 Receiving DS-1 CSU Loopback

Voice

Channels

V.35

Data

DS-1 Network

CSU

Loopup Code

Receiving DS-1 CSU Loop

Causes a network/line loopback

Loopup code sent by remote unit or network,

occurs at local DS-1 CSU.

D4 - line loop "Unframed"

ESF AT&T Line/Payload

ESF BOM Line/Loop

DS-1 vendor checks framing/errors

12.9.7 Sending DS-1 CSU Loopback

Voice

Channels

V.35

Data

CSU Loopup	CSU Loopup
Code	Code
	DS-1 Network

Send DS-1 CSU Loop

Local unit sends CSU loopup code, loop occurs at remote

CSU. This is a line loop only.

Check for framing/errors at local unit. Commands: ds1 1 send line loopup

ds1 send network QRSS statistics ds1 1 current ds1 1 send loopdown

Figure 12-7: Sending DS-1 CSU Loopback

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