Hi Huub,

There is one thing i don't understand about sdh multiplexing:
why 3xTUG-3 are multiplexed in one VC-4 and not directly in AU-4?
TU-12s are directly multiplexed in TUG-2, same thing for TUG-2s which are directly multiplexed in TUG-3 and not in VC-3, so why we can't do the same thing for TUG-3??

Thanks,
Ramzi

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Hello Ramzi,

You wrote:

There is one thing i don't understand about sdh multiplexing:
why 3xTUG-3 are multiplexed in one VC-4 and not directly in AU-4?
TU-12s are directly multiplexed in TUG-2, same thing for TUG-2s
which are directly multiplexed in TUG-3 and not in VC-3, so why
we can't do the same thing for TUG-3??

The switching matrices in SDH equipment are at VC-n level,
the higher order at VC-4 level and the lower order at VC-11, VC-12,
VC-2 level.

Mapping TUG3 directly into AU4 would bypass the VC-4 switch matrix.

Best regards, Huub.



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--- SoupGate-Win32 v1.05
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Hello Huub,

You wrote:

The switching matrices in SDH equipment are at VC-n level,
the higher order at VC-4 level and the lower order at VC-11, VC-12,
VC-2 level.

I think you forgot VC-3

Mapping TUG3 directly into AU4 would bypass the VC-4 switch matrix.

So theoretically we can do it! but for practical reasons we don't?

Please correct me if I'm wrong, suppose we have 63xE1 tributary card cross-connected to STM-1 line card, in this case the VC-4 is structred onto 63 VC-12, so we only need to use the LO switch matrix.

In the second case, suppose we have 2 STM-1 line cards cross-connected directly, despite the fact that each VC-4 is structred onto 63 VC-12, we only need to use the HO switch matrix.

Thanks,
Ramzy

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Hello Ramzi,

You replied:

The switching matrices in SDH equipment are at VC-n level,
the higher order at VC-4 level and the lower order at VC-11, VC-12,
VC-2 level.

I think you forgot VC-3

In SDH equipment the VC-3 is lower order, in SONET equipment
VC-3 (or STS-1) is higher order.

Mapping TUG3 directly into AU4 would bypass the VC-4 switch matrix.

So theoretically we can do it! but for practical reasons we don't?

If your network consists of onlt STM-1 ADMs and links it will work.
But as sson as there are STM-N (N>1) in the network you need the VC-4.

Please correct me if I'm wrong, suppose we have 63xE1 tributary card
cross-connected to STM-1 line card, in this case the VC-4 is structred
onto 63 VC-12, so we only need to use the LO switch matrix.

Indeed, the VC-4 cross-connect consists of s single connection.

In the second case, suppose we have 2 STM-1 line cards cross-connected
directly, despite the fact that each VC-4 is structred onto 63 VC-12,
we only need to use the HO switch matrix.

Yes, some vendors call this a digital cross connect DXC.

Cheers, Huub.


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Thank you Huub for your answers.

Ramzy

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