Re: coments on draft G.SHDSL.BIS MIB

Lee,

Thanks for your comments.

I need to study the rates a little closer as I don't feel I currently 
have a good understanding of  the values. I should be able to respond in 
a few days.

Thanks,
Clay Sikes

[email protected] wrote:

>
>
>
>Thank you Clay for taking on the editorship of G.SHDSL.BIS.
>My comments are below.
>
>Reference this paragraph:
>
>  
>
>>2.3.2.   Changes to Line Rate Objects
>>
>> Four objects in the HDSL2/SHDSL Line MIB have rate limitations.
>>  In each case, these objects have the syntax
>>
>>       SYNTAX      Unsigned32(0..4112000)
>>
>>  Changes introduced in G.SHDSL.bis support an increased upper rate
>>  of 5696 kbits/s, leading to the updated syntax
>>
>>       SYNTAX      Unsigned32(0..5696000).
>>    
>>
>
>
>Comments:
>
>I think the original RFC3276 was incorrect with respect to the maximum line
>rate for 2 pairs.
>A single G.SHDSL pair may have a line rate up to 2312000 bps.  With two
>pairs, doubling that amount
>would be 4624000.  I think RFC3276 incorrectly doubled the value of
>(2048000 + 8000) to get 4112000.
>
>Now, with 4 wire pairs, it seems correct to have 2312000 * 4,  or 9248000
>as the maximum line rate.
>Am I missing something ?  Is there something I don't understand about the
>5696000 number ?
>
>I also think the defaults should follow G.SHDSL instead of HDSL2.
>The default for hdsl2ShdslSpanConfMinLineRate would be 200000 (192000 +
>8000).
>And the default for hdsl2ShdslSpanConfMaxLineRate would be 2312000.
>
>Also, I think a status parameter with the data rate or effective bandwidth
>of the span would
>be useful.  The maximum data rate would be (2312000 - 8000) * 4, or
>9216000.
>
>hdsl2ShdslStatusActualDataRate OBJECT-TYPE
>           SYNTAX      Unsigned32(0..9216000)
>           UNITS       "bps"
>           MAX-ACCESS  read-only
>           STATUS      current
>           DESCRIPTION
>           "Contains the actual data rate for this HDSL2/SHDSL span. "
>
>       ::= { hdsl2ShdslSpanStatusEntry xxx }
>
>
>Comments ?
>
>Lee Nipper
>Verilink Corporation
>
>
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