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Access Navigator - Release 1.8 August 2003 15-29
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.
n DS1 Loopdetect ... 15-29
n DS1 FDL Protocol ... 15-29
n DS1 Line Loopback ... 15-30
n 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 <on|off>
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 <none|slc96|t1403>
Field Description
n DS1 number, 1 to 32, or a range of numbers such as 2-8.
none Disable FDL. (This is the required setting for remote
management of Adit 600 terminals. See Set DS1 Remote Device
Mgmt on
page 18-113.)
slc96 Enable communications with Shelf A of SLC-96/TR-08 group.
(Supports Access Bank I/TR-08 and line loopback commands.)
t1403 Enable detection and response to ANSI T1.403 bit-patterned
codes over the FDL.