RE: TX-RX gain in Sig MIB Draft

Satish,

Can you propose a range? The original proposal did not contain specific
boundaries (except that imposed by Integer32).


Randy,

While I would agree in general regarding the DEFVAL, this MIB object
would need to go by recommendations (or RECOMMENDATIONS as you pointed
out):


           "The default values are based on the deployed markets. Some  
           recommendations are made as follows: 
           - Based on the default G.711 Vocoder maximum of 3.14 or 3.17

             dBm a default value of '-4 dB' provides a maximum analog  
             signal level at the a-b (T/R) termination point 
           - Based on [ETSI TS 101 909-4], which provides guidance of  
             11 dB loss (-11 dB gain), a default value of '-11 dB' is  
             recommended." 

Is that ok?

Also, thanks for the pointer on '[email protected]'. I got the
following
Warning messages for this MIB:

W1. mailbody:1173: [5] {integer-misuse} warning: use Integer32 instead
of INTEGER in SMIv2
W2. mailbody:1136: [5] {index-element-not-column} warning: index element
`pktcSigDevToneType' of row `pktcSigDevToneEntry' must be a column
W3/ mailbody:1136: [5] {index-element-not-column} warning: index element
`pktcSigDevToneType' of row `pktcSigDevMultiFreqToneEntry' must be a
column

W1 is due to the fact the we use enumerations at various places and W2
and W3 are due to the fact that 
'pktcSigDevToneType' is defined outside of the two tables, but binds
them together.

Anything of concern with these warnings?


The MIB itself is available at:

ftp://ftp.ietf.org/internet-drafts/draft-ietf-ipcdn-pktc-signaling-08.tx
t


Thanks
Sumanth

 

-----Original Message-----
From: Satish Kumar at Texas Instruments 
Sent: Tuesday, June 21, 2005 7:27 PM
To: [email protected]
Cc: Sumanth Channabasappa
Subject: TX-RX gain in Sig MIB Draft

Hi,

Question on pktcNcsEndPntConfigTxGain  and pktcNcsEndPntConfigRxGain 

The MIB description is pasted below. There is no range of values defined
for these MIBs. Setting random values impact the devices badly. It is
good to retsrict these MIBs with specific range values. 


pktcNcsEndPntConfigTxGain OBJECT-TYPE  
       SYNTAX Integer32  
       UNITS "dB"  
       MAX-ACCESS read-create 
       STATUS current  
       DESCRIPTION  
           "This MIB Object represents the per line transmitter (A/D)  
           gain. A positive number reflects a signal gain, a negative  
           number reflects a signal loss. This MIB Object may provision

           the gain or it may be used to document a non-provisionable  
           gain between the telco (POTS) a-b (T/R) terminals and the  
           analog codec maximum PCM coding limit (PCM maximum coding  
           limit).  Based on the default G.711 Vocoder maximum of 3.14  
           or 3.17 dBm the -4 dB gain default provides Vocoder coding  
           protection against TE maximum signals while also providing  
           an initial loss to minimize analog signal echo. " 
       DEFVAL { -4 }  
       ::= { pktcNcsEndPntConfigEntry 39 } 
    
   pktcNcsEndPntConfigRxGain OBJECT-TYPE  
       SYNTAX Integer32  
       UNITS "dB"  
       MAX-ACCESS read-create  
       STATUS current  
       DESCRIPTION  
           "This MIB Object represents the per line receiver (D/A)  
           gain. A positive number reflects a signal gain, a negative  
           number reflects a signal loss. This MIB Object may provision 
           the gain or it may be used to document a non-provisionable  
           gain for use with the pktcSigDevToneDbLevel Object to set  
           the desired level at the a-b (T/R) terminals.  
    
           The default values are based on the deployed markets. Some  
           recommendations are made as follows: 
           - Based on the default G.711 Vocoder maximum of 3.14 or 3.17

             dBm a default value of '-4 dB' provides a maximum analog  
             signal level at the a-b (T/R) termination point 
           - Based on [ETSI TS 101 909-4], which provides guidance of  
             11 dB loss (-11 dB gain), a default value of '-11 dB' is  
             recommended." 
       ::= { pktcNcsEndPntConfigEntry 40 } 

Comments please..!

Thx, Satish