DOCUMENT:Q136032  31-JUL-2001  [sms]
TITLE   :Systems Management Server Sender Packet Size Computation
PRODUCT :Microsoft Systems Management Server
PROD/VER:winnt:1.0,1.1
OPER/SYS:
KEYWORDS:kbnetwork smssenders kbSMSSender

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Systems Management Server versions 1.0, 1.1 
-------------------------------------------------------------------------------


SYMPTOMS
========

The Sender is designed to dynamically compute a packet size based on link speed
when sending packages. It begins with a 1024 byte packet and records the time to
transmit. Based on this time, the sender increases or decreases the packet size
as necessary within the range of 1024 to 262144 bytes.

However, there is a range of speeds where the Sender does not adjust packet size
correctly, forcing the maximum packet size on a link that is too slow.

CAUSE
=====

The Sender incorrectly computes the packet size.


NOTE: In many WAN environments 56k bit to 256k bit links are common. Some WANs
have links below 38k bits per second, such as when using modems for a RAS Sender
address.

The following table lists link speed and the corresponding packet size:

   Link Speed   Byte Buffer
   (bits/sec)   Packet Size
   ----------   -----------
   262144       262144
   6552         245700
   6112         229200
   5672         212700
   5232         196200
   4792         179700
   4352         163200
   3912         146700
   3472         130200
   3032         113700
   2592         97200
   2152         80700
   1712         64200
   1272         47700
   832          31200
   424          15900
   216          8100
   104          3900
   48           1800


STATUS
======

Microsoft has confirmed this to be a problem in Systems Management Server
versions 1.0 and 1.1. This problem has been corrected in Systems Management
Server version 1.2.

Additional query words: prodsms sms

======================================================================
Keywords          : kbnetwork smssenders kbSMSSender 
Technology        : kbSMSSearch kbSMS100 kbSMS110
Version           : winnt:1.0,1.1

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2001.