| Description | This object specifies the type of the end device and
the type of mechanism used to establish the loopback.
Loopback type may not be modified once the farend loopback
is established.
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.
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.
latchDSU(9): Latching DSU .
latchHL96(10): Latching HL96 device.
v54PN127Polynomial(8): For fractional T1.
This loopback is based on
CCITT-ITU V.54 and is
used to place either a single
DS0 or a DS0 Bundle(N*DS0) in
loopback mode.
lineInband(12): This is used to loop back the
entire T1 line at the far end.
This is a repeating 5-bit
pattern(00001), i.e. 00001000010001....
lineLoopbackESF(13): This loopback results 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 be
sent to the remote end requesting that it
enter into a network line loopback.
payloadLoopbackESF(14): 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 be
sent to the remote end requesting that it
enter into a network payload loopback.
noCode (15): LoopBack is on this device - NearEnd.
lineLoopbackFEAC(16): The FEAC channel is used to request
a line loopback
at the Far-end. Loopback activate and
de-activate are specified using the
code-words specified in ANSI T1.404-1994.
smartJackInband(17): 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-payloadLoopbackESF, 15-noCode, 16-lineLoopbackFEAC, 17-smartJackInband) |