Cisco BERT Loopback Code

1.3.6.1.4.1.9.9.185.1.1.1.1.6

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.