Wireshark-users: Re: [Wireshark-users] monitor an STM-1 link
From: "Sheahan, John" <[email protected]>
Date: Mon, 9 Jun 2008 08:56:26 -0400
Title: [Wireshark-users] monitor an STM-1 link
if you are using a passive tap, you should be able to maintain bidirectional connectivity on the STM-1 and the link should have come back up. Perhaps you're tap is not passive?

From: [email protected] on behalf of Tamás Varga
Sent: Mon 6/9/2008 8:25 AM
To: [email protected]
Subject: [Wireshark-users] monitor an STM-1 link

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?

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

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