applicability of LMP's verify procedure

[Michiel van Everdingen <MvanEverdingen@lucent.com>]

Hello all,

My feeling is that the verify procedure as described in LMP is
only applicable for CTP-->--CTP and CTP-->--TTP dataLinks. The
verify procedure is not applicable for TTP-->--CTP and
TTP-->--TTP dataLinks.
(CTP = Connection Termination Point
 TTP = Trail Termination Point)


Is this correct ?


For example, the verify procedure is not applicable between a
SONET/SDH multiplexer, that starts the STM-n/OC-n dataLink, and
a transparent optical cross connect. I.e. in the figure below:
the verify procedure is not applicable for dataLink 'A'.

+------+      +------+      +------+      +------+
|    T-|--->--|-C  C-|--->--|-C  C-|--->--|-T    |
|      |   A  |      |   B  |      |   C  |      |
|      |      |      |      |      |      |      |
| NE-1 |      | NE-2 |      | NE-3 |      | NE-4 |
+------+      +------+      +------+      +------+



According to ITU-T G.831, "the access point identifier should not
change while the access point remains in existence". I.e. in the
example, the SONET/SDH multiplexer has to constantly send out the
same J0 "test-signal".

This behaviour makes sense in my mind as the receiver (NE-2 in the
example) can *always* verify the dataLink: the so-called test-message
is *constantly* sent by the TTP. In other words there is no need to
"start" a verification sequence.


Best regards,

Michiel


-- 
+------------------------------------------------------------------+
| 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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