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

From: "Eugene Nechamkin" <[email-masked]>
Date: Mon, 1 Mar 2004 12:11:52 -0800

In general, we agree that that an analog reference point would be easier to understand from the operator's standpoint. Our initial goal as stated when this issue was raised was to eliminate the loss of SNR due to combined requirements of the analog reference point and the high DLP for some countries. 

As you have stated previously, the largest signal level for voiceband tones is 0dBm. However, this isn't the largest value that would need to be generated out of the MTA. Rather this is the maximum of the range for some signals that is acceptable for that tone. For example, in the UK, dialtone can be between -27dBm and 0dBm to be valid, it doesn't mean that dialtone of 0dBm needs to be generated. Even if we restricted the MIB range slightly, we believe we would far exceed the requirements in EN 300 001. 

Therefore, we believe the range should further be restricted to -25dB to -3dB to help alleviate this problem. If we could make this change, and keep the analog reference point, then this should be an acceptable solution to all of the concerns raised. Here is what the final definition of this parameter would look like:

pktcSigDevToneDbLevel    OBJECT-TYPE 
    SYNTAX       Integer32 (-250..-30) 
    UNITS        "TenthdBm" 
    MAX-ACCESS   read-write 
    STATUS       current 
    DESCRIPTION 
        " This is the decibel level at which tones could be
          generated at the a and b terminals (TE connection point)."
    DEFVAL { -4 } 
    ::={pktcSigDevToneEntry 2 } 

Eugene Nechamkin,
Bradcom Corp.
ph: (604) 233-8500

-----Original Message-----
From: Beacham Gordon-CGB005 [mailto:[email-masked]]
Sent: Thursday, February 05, 2004 3:55 PM
To: [email-masked]'
Subject: RE: [ipcdn] 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-masked]

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