Tektronix CTS 850, User Manual

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Basic Test Procedures
3–10
CTS850 SDH/PDH Test Set User Manual
connecting the upstream and downstream signals to the RECEIVE
input.
Table 3–1 shows the responses expected from Line Terminating
Equipment (LTE), such as an STM-4/STM-1 multiplex section
terminating element, when presented with three possible error and
alarm conditions.
Table 3–1: LTE Responses to Errors and Alarms
Transmitted Error or
Alarm Expected Upstream
Response Expected Down-
stream Response
RS B1 Error MS REI none
MS AIS MS RDI AU AIS
HP RDI none HP RDI
LOS MS RDI AU AIS
1. Connect two CTS850s to an LTE as shown in Figure 3–4.
LTE
Downstream
Upstream
CTS 850 SDH/PDH Test Set CTS 850 SDH/PDH Test Set
All Signals are
STM-1E
Figure 3–4: Setup to Check Error and Alarm Response