Cell Relay Archive

["XuHonggang" <xuhg@cet.st.com.sg>]

Hi,saso
I think you mean CCS, of course,a stucture should include it, I just
try to explain the relation between a sample and a octet, since the
relation will decide how to design your buffer and tx/rx schedule.
By the way, is there anyone here really using AAL1 in carrier network?
I curious.
regards
honggang
-----Original Message-----
From: Saso Stojanovski <sasos@nortelnetworks.com>
To: XuHonggang <xuhg@cet.st.com.sg>
Cc: Nuzhath Shereen <shereen@chequemail.com>; rajagopalan.sampath@wipro.com
<rajagopalan.sampath@wipro.com>; cell-relay <cell-relay@cell.onecall.net>
Date: Friday, July 28, 2000 11:01 PM
Subject: Re: CR: Structured Data Transfer in AAL Type 1 !


>xu,
>
>
>just two remarks:
>
>   1) both af-vtoa-0078 and I.363.1 tend to agree that:
>
>"The P[ointer] format is used *exactly once* in every cycle, where a cycle
is
>the sequence of consecutive SAR-PDUs with sequence count values 0 through
7."
>
>as i understand it, even if your structure appears several times within the
>block of 8 consecutive payloads (4 x (46 + 47) = 384 octets), you should
use
>the pointer only once.
>
>   2) the structure size octets equals the number of voice channels only if
you
>use circuit emulation without CAS; otherwise, the structure size is much
larger
>(see af-vtoa-0078).
>
>
>cheers,
>    v
>--saso
>
>
>
>
>XuHonggang wrote:
>
>> Hi,
>> Pointer field is 7 bits, so max offset which it can idicate is 127 Octets
>> which < 3 ATM cells p and > 2 ATM cells, so standard maker decided to use
96
>> as max number wich align with 2 ATM cells.
>> You put a pointer in no.0 cell, it can cover all possible offset in no.0
and
>> no.1, so second pointer only need to appear in no.2, the same thing
happen
>> to no.4 and no.6 cell.
>> Yes, a octet means 8 bits, means one sample of a voice channel. How many
>> octets
>> in your structure means how many voice channels in your structure.
>> wish it help
>> XuHonggang
>> SwitchingSystemDepartment
>> CET Techologies of Singapore Technologies
>> 24 AngMoKio Str. 65
>> Singapore 569061
>> -----Original Message-----
>> From: Nuzhath Shereen <shereen@chequemail.com>
>> To: sasos@nortelnetworks.com <sasos@nortelnetworks.com>
>> Cc: rajagopalan.sampath@wipro.com <rajagopalan.sampath@wipro.com>;
>> cell-relay@cell.onecall.net <cell-relay@cell.onecall.net>
>> Date: Thursday, July 27, 2000 5:26 PM
>> Subject: Re: CR: Structured Data Transfer in AAL Type 1 !
>>
>> >
>> >
>> >Hello Saso,
>> >
>> >Can you explain more about this SDT format. The ITU-T I.363.1  says that
>> the pointer format may be used only if the sequence count value is 0,2,4
or
>> 6. This is because the 1,3,5 and 7 values are reserved for SRTS.
>> >
>> > I didn't understand the rest of the explanation in the standard. What
is
>> this 93-octet payload it refers to. By octet, Is it referring to one
64kps
>> channel (I had read that somewhere) or is the digital 8 bits.
>
>
>