Configures a loopback at the DS1/E1 over SONET/SDH
VT layer on channelized SONET and SDH interfaces. The no version turns off the loopback.
Options
pathChannel—Number, in the
range 1–2147483648, that identifies the path
tributaryIdentifier—Specifier
for the tributary in the format pathChannel { ds1 | e1 } pathPayload/tributaryGroup/tributaryNumber
pathPayload—Payload number
for the path; value is 1 for SONET and in the range 1–3 for
SDH
tributaryGroup—Number, in
the range 1–7, that identifies the group within the path
tributaryNumber—Number of
the tributary within the tributary group; the value is in the range
1–4 if the tributary type is vt15 or tu11 and in the range 1–3
if the tributary type is tu12
local—Loops the router output data back toward the
router at the T1/E1 framer; on supported line modules also sends an
alarm indication signal (AIS) out toward the network.
network { line | payload }—Specify the line keyword to loop the data back toward the network
before the T1/E1 framer and automatically set a local loopback at
the HDLC controllers. Specify the payload keyword to loop the payload data back toward the network at the
T1/E1 framer and automatically set a local loopback at the HDLC controllers.
remote line fdl ansi (T1 line only)—Sends a repeating
16-bit ESF data link code word (00001110 11111111) to the remote end
requesting that it enter into a network line loopback. Specify the ansi keyword to enable the remote line FDL ANSI bit
loopback on the T1 channel, according to the ANSI T1.403 specification.
remote line fdl bellcore (T1 line only)—Sends a
repeating 16-bit ESF data link code word (00010010 11111111) to the
remote end requesting that it enter into a network line loopback.
Specify the bellcore keyword to enable
the remote line FDL Bellcore bit loopback on the T1 channel, according
to the Bellcore TR-TSY-000312 specification.
remote payload [ fdl ] [ ansi ] (T1 line only)—Sends
a repeating 16-bit ESF data link code word (00010100 11111111) to
the remote end requesting that it enter into a network payload loopback.
Enables the remote payload FDL ANSI bit loopback on the T1 channel.
You can optionally specify fdl and ansi, but it is not necessary.
Note:
You cannot send an inband pattern to the remote end requesting
that it enter into a network line loopback.
