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RIdea bandwidth for VoIP and Video Conferencing [7:80731] posted 12/12/2003
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Hi Group,

Now I have upgraded, Site A is SDSL UL1.5MB/ DL 1.5MB and
Site B is SDSL UL1.5MB/ DL 1.5MB using VPN connected each other.
Will this enough for VoIP and Video Conferencing? Please advice... Thanks
Mate.

Do a "pathping" from Site A to Site B Server and captured the result below
:-

Tracing route to 192.0.30.2 over a maximum of 30 hops
  0  steivenmobile [192.0.1.175]
  1  192.0.1.212
  2  192.0.30.2
Computing statistics for 50 seconds...
                   Source to Here   This Node/Link
Hop  RTT    Lost/Sent = Pct  Lost/Sent = Pct  Address
  0
steivenmobile [192.0.1.175]
                                                   0/ 100 =  0%   |
  1     0ms          0/ 100 =  0%     0/ 100 =  0%  192.0.1.212
                                                   0/ 100 =  0%   |
  2  120ms         0/ 100 =  0%     0/ 100 =  0%  192.0.30.2
Trace complete.

Rgds,
Steiven

----- Original Message ----- 
From: "Jim Brown" 
To: "Steiven Poh-(Jaring MailBox)" ;

Sent: Tuesday, April 08, 2003 10:39 PM
Subject: RE: Idea bandwidth for Video Conferencing [7:67081]


> I don't think you have nearly enough bandwidth.
>
> Video connections are full duplex, so you need bandwidth in both
> directions. The available bandwidth will be half. A 64Kbps connection
> could only support a 32Kbps call. I may be over simplifying this, but
> you should get the idea. Toss on the overhead with encryption and
> decryption of the VPN and you are practically left with nothing.
>
> Video connections are extremely delay sensitive. And the cursory ping
> test show a latency of +300ms. This is pushing the boundary of what I
> would consider acceptable.
>
> Jitter can be as big an enemy of video as delay and you are seeing a
> difference of 70ms between the fastest and slowest pings and if my
> memory servers me correctly only 1% packet loss is acceptable for video.
>
> It is really hard to tell you if you have enough bandwidth for video
> calls. If you could be more specific about your application it would be
> helpful. This would help define what acceptable quality is compared to
> the use.
>
> -----Original Message-----
> From: Steiven Poh-(Jaring MailBox) [mailto:lppoh@xxxxxxxxxxxx]
> Sent: Tuesday, April 08, 2003 5:11 AM
> To: cisco@xxxxxxxxxxxxxx
> Subject: Idea bandwidth for Video Conferencing [7:67081]
>
>
> Hi Group,
>
> I have two site, each site have leased line to ISP.
>
> Site A is 128K and Site B is 64K using VPN connected each other.
> The question here is what is the idea bandwidth for video conferencing?
>
> I have done some ping process each site server and here is the result,
> please give me some comment do I have sufficient bandwidth go for video
> conferencing?
>
> 1)
> Do a "pathping" from Site A to Site B Server and capture the result.
> [Results -
> Pinging 192.0.31.2 with 32 bytes of data:
> Reply from 192.0.31.2: bytes=32 time=403ms TTL=126
> Reply from 192.0.31.2: bytes=32 time=313ms TTL=126
> Reply from 192.0.31.2: bytes=32 time=336ms TTL=126
> Ping statistics for 192.0.31.2:
> Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
> Approximate round trip times in milli-seconds:
> Minimum = 313ms, Maximum = 403ms, Average = 350ms]
>
> 2)
> Do a traceroute from Site A to Site B Server and capture the result.
> [Result -
> Tracing route to Site B [192.0.31.2] over a maximum of 30 hops:
> 1     4 ms     4 ms     3 ms  192.0.1.100
> 2   399 ms   356 ms   411 ms  192.0.31.254
> 3   417 ms   408 ms   367 ms  Site B [192.0.31.2]
> Trace complete.]
>
> Thanks,
>
> Rgds,
> Steiven




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