Hi Experts,

we want to monitor the traffic of an STM-1 (OC-3) link
between two Cisco LS1010 ATM switches. For this purpose,
we put an optical splitter in both forward and backward
direction that produces -26 dBm signal level on the
monitored link. The receiver sensitivity on the monitor
device is stated to be -28 dBm. The receiver link on
the monitor node does not go up (after administrative shut
down is disabled).

Questions, if someone has experience:
- is it possible to force link up even no Tx I/F connected?
- does STM-1 need to have bidirectional connectivity?

thanks,
 Tamas
                           
 +---------+                                      +---------+
 |        Tx-----------------T--------(dampener)->Rx        |
 | LS1010  |                 |                    |  LS1010 |
 |        Rx<--(dampener)----------T--------------Tx        |
 +---------+                 |     |              +---------+
                             |     |
                             v     v
                         +-----------+
                         |Tx Rx Tx Rx|
                         |           |
                         |  Monitor  |
                         |  LS1010   |
                         +-----------+

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