Diagnostics & Troubleshooting

Near-End Loopbacks

Near-End Loopbacks

NOTE: The DS1 must be set Out of Service, using the set ds1 <n> down command, before you can use loopbacks or test patterns.

￿DS1 Loopdetect ... 15-29

￿DS1 FDL Protocol ... 15-29

￿DS1 Line Loopback ... 15-30

￿DS1 Payload Loopback ... 15-30

DS1 Loopdetect

Enables CSU line loopback testing of the Access Navigator. When loop request code detection is turned on, the Access Navigator will respond to T1.403 defined in-band(bit pattern) CSU line loopback request. See Figure 15-4.

On drop DS1s with ESF framing and T1.403 FDL protocol, the Access Navigator will also respond to out-of-band (FDL) loopback requests.

Syntax: set ds1 <n> loopdetect <onoff>

DS1 FDL Protocol

Selects the FDL protocol used on drop DS1s. Switch and groom DS1s do not use FDL. The factory default setting is “none,” which also turns off out-of-band (FDL) loopback code detection and transmission over the FDL channel.

The application affects the permissible DS1 Type, Framing, Line Code, FDL, and Remote Management selections. (See Application Configuration Requirements on page 18-107.)

Syntax: set ds1 <n> fdl <noneslc96t1403>

Field

n

none

slc96

t1403

Description

DS1 number, 1 to 32, or a range of numbers such as 2-8.

Disable FDL. (This is the required setting for remote management of Adit 600 terminals. See Set DS1 Remote Device Mgmt on page 18-113.)

Enable communications with Shelf A of SLC-96/TR-08 group. (Supports Access Bank I/TR-08 and line loopback commands.)

Enable detection and response to ANSI T1.403 bit-patterned codes over the FDL.

Access Navigator - Release 1.8

August 2003

15-29

Page 371
Image 371
Carrier Access Access Navigator Near-End Loopbacks, DS1 Loopdetect, DS1 FDL Protocol, Syntax set ds1 n loopdetect onoff