RE: RE: IETF IPCDN Signaling MIB - Draft 3 - Last Callfor Comments (NEW ISSUE pktcSigDevToneDbLevel reference point)

Motorola does not agree with the proposed change to a digital reference point.
In looking at the PC NCS spec, there is guidance that the RJ11 connector is the appropriate reference point. The MIB also supports RJ11 as the reference point:
"An endpoint or MTA endpoint is a standard RJ-11 telephony physical port located on the MTA and used for attaching the telephone device to the MTA."
In addition, the Telecommunications industry uses the RJ11 connector as the reference (interface) point. Newer standards also use this as the demarcation between the Network Operator and the CPE, thus it is the user "interface" reference. Changing to an internal reference point (digital PCM code) does not have meaning since it cannot be directly measured by the operator  when the MTA is installed.
Therefore, it is appropriate for the reference to be as presently stated in the pktcSigDevToneDbLevel object. The MIB, which is provisioned by the operator of the system must be "friendly" to the operators point of view. To burden the operator with tracking loss plans (which may vary from MTA to MTA or line to line) is not practical. 
Gordon Beacham
Digital Core Gateways, BCS
Motorola, Inc.
858-404-2335
[email protected]