hello hub, hope you are fine,
Imagine two mux connected as STM1 at one side and STM 4 at other side what will be the alarm which am gonna get on both STM ports and can you clarify me why ?

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Hello Richard,

You ask:

Imagine two mux connected as STM1 at one side and STM 4 at
other side

Something like this?

+-----+ +-----+
STM-1 | | STM-4 | | STM-1
------+ mux +-----------+ mux +-------
| | | |
+-----+ +-----+

what will be the alarm which am gonna get on both STM ports

You will only get an alarm when there is a failure somewhere
in this network. It depends on the failure where and what kind
of alarm will be reported.

and can you clarify me why ?

Where is the failure?

Regards, Huub.


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I meant two node are connected each other via fiber, and one end is STM 4 port and other side is STM 1(which normally no one connects) so I this case what will be the alarm I will get on both STM ports

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On Tuesday, June 12, 2018 at 10:09:41 PM UTC+5:30, richardo...@gmail.com wrote:

I meant two node are connected each other via fiber, and one end is STM 4 port and other side is STM 1(which normally no one connects) so I this case what will be the alarm I will get on both STM ports

Hi Richardo, When we connect two different STM ports, we get Loss of Frame alarm on STM port.
Its due to Different Frame Overhead size. e.g 9-Rows*9-Column block for STM-1 & 9-rows*36(9*4) column for STM-4.

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Thanku so much huub😊
Sorry for the spell mistake

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Hello Richard,

You explain:

I meant two node are connected each other via fiber, and one
end is STM 4 port and other side is STM 1(which normally no
one connects) so I this case what will be the alarm I will
get on both STM ports

At the OSn termination function a loss of frame (LOF) defect will
be detected. Ans consequently a signal fail (SF) will be reported
to the management system.

Regards, Huub.


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