9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-15-67
Circuit Loopbacks for 9500 MXC Node
The Circuit Loopbacks screen enables application of a both-way circuit loopback
on the TDM bus.
Circuit loopbacks can only be enabled for configured circuits, identification of
which is by circuit name, as entered in the Configuration > Circuits screen.
All circuit rates are supported, as set for the backplane; E1, E3, DS1, DS3 or
STM1/OC3. Auxiliary data circuits are also supported.
Only one Circuit Loopback can be applied at a time. Currently there is no
time-out provision; to clear a loopback an activated loopback must be
de-activated.
Only traffic on the selected circuit is affected by Circuit Loopback activation.
In conjunction with the built-in PRBS Generator in DAC plug-ins, Circuit
Loopbacks provide a user-friendly tool for tracing and checking a circuit through
a 9500 MXC network.
Figure 15-26 shows a typical Circuit Loopbacks screen for an E1-configured
backplane.
To permit straight-forward identification of a circuit within a 9500 MXC network,
each circuit must have a unique name. A circuit name is entered in the Circuits
screen, and the same name should be entered at all Nodes carrying that circuit.
It is recommended Trib names, as set in a DAC plug-ins screen, also have the
same name as its circuit, or include the circuit name. This is to permit easy
association of a trib with its circuit when setting a DAC PRBS test on a circuit
loopback.
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