| Description | This object specifies the type of the end device and
the type of loopback code used.
Latching Loopback: Latching Loopback is appropriate with
64 kbit/s DS0-A rate. Once invoked by a specific activation
sequence, it typically remains in effect until released by
another specific code sequence.
non-latching loopback: Non latching activation involves
continuous transmission of loopback command codes, followed
by test data interspersed with command codes.
The possible values are:
Note: The values 1 to 14 are for farEndLoopback.
cbLoopback object is farEndLoopback(1) when these values are
selected.
nonLatchOCUwithOneDevice(1): Non-latching OCU with one device.
nonLatchOCUwithChainDevices(2): Non-latching OCU with chain
of devices.
nonLatchCSU(3) : Non-latching CSU.
nonLatchDSU(4) : Non-latching DSU.
latchDS0Drop(5) : Latching DS0-DP Drop device.
latchDS0Line(6) : Latching DS0-DP line device.
latchOCU(7) : Latching OCU.
latchCSU(8) : Latching CSU.
latchDSU(9) : Latching DSU.
latchHL96(10) : Latching HL96 device.
v54PN127Polynomial(11) : For fractional T1.
This loopback is based on
CCITT-ITU V.54 and is being
used to place either a single
DS0 or a DS0 Bundle(N*DS0) in
loopback mode.
lineInband(12) : This is used for loopback the
entire T1 line at the far end.
This is a repeating 5-bit
pattern(00001).
lineLoopbackESF(13): This loopback result in a full
1.544Mbit/s loopback of the
incoming signal at the far end.
The loopback is activated (latched) and
deactivated by a bit sequence defined in
ANSI T1.403 - 1995.
This corresponds to Facility Data Link
(FDL)loopbacks on a T1 channel.
This causes a repeating,16-bit ESF data
link code word(00001110 11111111) to
the remote end requesting that it
enter into a network line loopback.
localLoopback(14): This is for loop back at the
near end (facility end).
This is used to test the internals of the
device, the interface loops back the
outbound traffic from SRM to SM, back to
the SRM, hence testing the internal device
connectivity.
noLoopbackCode(15): This is for situations, where
no loopback is needed for bert tests.
One example is manual loop back at near or
far end.
payloadLoopbackESF(16): This loopback results
in 1.536 Mbit/s loopback of the payload
of the incoming signal at the far end.
The loopback is activated (latched) and
deactivated by a bit sequence defined in
ANSI T1.403 - 1995.
This corresponds to Facility Data Link
(FDL)loopbacks on a T1 channel.
This causes a repeating, 16-bit ESF data
link code word(00010100 11111111) to
the remote end requesting that it
enter into a network payload loopback.
lineLoopbackFEAC(17): Use the FEAC channel to
establish a line loopback.
smartJackInband(18): Inband loop code for SmartJack (a Telco owned
device that represents the demarcation point of T1 service),
Ref: TR-TSY-000312. |
| Syntaxe | Enumeration (1-nonLatchOCUwith1, 2-nonLatchOCUwithout1, 3-nonLatchCSU, 4-nonLatchDSU, 5-latchDS0Drop, 6-latchDS0Line, 7-latchOCU, 8-latchCSU, 9-latchDSU, 10-latchHL96, 11-v54PN127Polynomial, 12-lineInband, 13-lineLoopbackESF, 14-localLoopback, 15-noLoopbackCode, 16-payloadLoopbackESF, 17-lineLoopbackFEAC, 18-smartJackInband) |