[IPFIX] RFC 3550 jitter

Dear IPFIX experts,

I'd like to request an IPFIX IE for jitter from IANA. RFC 3550 defines a 
suitable "interarrival jitter". Unfortunately it's measured in 
"timestamp units":

       An estimate of the statistical variance of the RTP data packet
       interarrival time, measured in timestamp units and expressed as an
       unsigned integer.


Therefore it seems we may need multiple IEs: one for units of 
milliseconds, one for microseconds, one for nanoseconds...
Else comparison of two jitter values would be meaningless.

So I request your feedback on the following:

Name: interarrivalJitterMilliseconds
Type: unsigned32
Semantic: quantity
Description: interarrival jitter as defined in section 6.4.1 of RFC 
3550, measured in milliseconds.
Units: milliseconds
References: [RFC3550]

Name: interarrivalJitterMicroseconds
Type: unsigned32
Semantic: quantity
Description: interarrival jitter as defined in section 6.4.1 of RFC 
3550, measured in microseconds.
Units: microseconds
References: [RFC3550]

Name: interarrivalJitterNanoseconds
Type: unsigned32
Semantic: quantity
Description: interarrival jitter as defined in section 6.4.1 of RFC 
3550, measured in nanoseconds.
Units: nanoseconds
References: [RFC3550]

Thanks,
P.
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