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Re: LMP & neighbor discovery
All,
I've received several private questions on how the neighbor
discovery function in
http://ops.ietf.org/lists/ccamp/ccamp.2002/msg00750.html
would work for the special case of SONET cross connects.
The problem would be that
- SONET HO path switches (STS-1, STS-Nc) would not have
J1 termination capabilities.
- SONET LO path switches (VT-1.5) would not have J2 termination
capabilities.
The solution is to use test signal generators that are able to
create and monitor the 'supervisory unequipped' signal
(see ITU G.707 and ITU G.783).
By virtue of this signal,
- SONET HO path switches (STS-1, STS-Nc) *do* have J1 termination
capabilities.
- SONET LO path switches (VT-1.5) *do* have J2 termination
capabilities.
Alternatively, SONET HO path switches can use J0 to discover the
OC trail and infer the STS connectivity from this discovered OC
trail. Likewise, SONET LO path switches can use J1 to discover
the STS trail and infer the VT-1.5 connectivity from this
discovered STS trail.
This alternative approach however has some limitations:
- Not applicable for serial compound linkConnections
See also http://ops.ietf.org/lists/ccamp/ccamp.2002/msg00621.html
- Not applicable for STS connectivity discovery in case regenerators
terminate the J0 in-between STS cross connects.
Same concept applies in SDH and OTN (supervisory unequipped is called
'NULL client' in OTN).
Hope this helps !
Best regards,
Michiel
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| Michiel van Everdingen |
| Systems Engineer |
| Lucent Technologies - Optical Networking Group |
| Botterstraat 45, 1271 XL Phone : +31 35 687 4883 |
| P.O. Box 18, 1270 AA Fax : +31 35 687 5976 |
| Huizen, The Netherlands mailto:MvanEverdingen@lucent.com |
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