RE: LMP Link Verification Clarification requested

["Jonathan Lang" <Jonathan.Lang@RinconNetworks.com>]

Richard,
  The first interpretation is correct.  I.e., this refers to the full
SONET/SDH interface, regardless of the Transport Mechanism.

Thanks,
Jonathan

> -----Original Message-----
> From: Bradford, Richard [mailto:rbradfor@cisco.com] 
> Sent: Tuesday, June 24, 2003 5:37 AM
> To: Jonathan Lang
> Cc: ccamp@ops.ietf.org
> Subject: LMP Link Verification Clarification requested
> 
> 
> The LMP Link Verification BEGIN_VERIFY class allows for the 
> Verify Transport Mechanism to carry a mask of allowed 
> transports. The TransmissionRate field contains:
>         "This is the transmission rate of the data link over 
> which the Test messages will be transmitted"
> 
> It appears there may be multiple interpretations of this 
> statement. One interpretation is that this refers to the same 
> data link used throughout the rest of the specification (i.e. 
> an OC3 = ~155M/8 bytes per second). An alternate 
> interpretation would be that this refers to the transmission 
> rate of the test messages themselves (i.e. DCCS = 192K/8
> bytes/sec)
> 
> Which interpretation is correct?
> 
> If the latter (i.e. the transmission rate of the test 
> messages), then the following questions need to be addressed:
> 
> The first question I have is how multiple Transport 
> Mechanisms can be advertised with one TransmissionRate.
> 
> Let's say that an OC3 interface is capable of verifying over 
> J0-16, DCCS, and Payload. J0-16 could be interpreted as 16 
> bytes/sec. DCCS could be 192K/8 bytes/sec. Payload could be 
> ~155M/8 bytes/sec.
> 
> The second question involves ambiguity when DCCS is 
> specified. The DCCS data rate of 192K/8 is the same for OC3, 
> OC12, OC48, etc. Knowing the DCCS data rate does not provide 
> useful information for interface termination. The source 
> device might be sending SDCC over OC12, while the receiver 
> might choose to terminate at OC48.
> 
> One possible solution to this problem rests on the 
> interpretation of "transmission rate of the data link". If 
> the TransmissionRate refers to the full SONET/SDH interface 
> regardless of the Transport Mechanism, then both of the above 
> problems are resolved. 
>