- This topic has 4 replies, 1 voice, and was last updated 23 years, 8 months ago by Rommel.
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30th January 2001 at 15:23 #33200RamasamyGuest
hai all,
i’m doing project in Voip,i need to know the packet size withheader compression & without header compression.kindly help me in this one.it is very urgent.mt mail ID :ramasamy1979@yahoo.com
ramm_1979@usa.net
thank u.30th January 2001 at 19:31 #33201Alex YuenGuestCalculation of Bandwidth in VoIP
No. of Frames 1 2 3 4 5 6 7 8 9 10 11 12 13
No. of bytes for RTP 12 12 12 12 12 12 12 12 12 12 12 12 12
No. of bytes for VDP 8 8 8 8 8 8 8 8 8 8 8 8 8
No. of bytes for IP 20 20 20 20 20 20 20 20 20 20 20 20 20
No. of bytes for ETHERNET 14 14 14 14 14 14 14 14 14 14 14 14 14
No. of bytes for voice 10 20 30 40 50 60 70 80 90 100 110 120 130
Packet Size (bytes) 64 74 84 94 104 114 124 134 144 154 164 174 184
Sampling at (ms) 10 20 30 40 50 60 70 80 90 100 110 120 130
Bytes in seconds 6,400 3,700 2,800 2,350 2,080 1,900 1,771 1,675 1,600 1,540 1,491 1,450 1,415
Link Speed (kbps) 51.20 29.60 22.40 18.80 16.64 15.20 14.17 13.40 12.80 12.32 11.93 11.60 11.32
Required Bandwidth for 1 DSP (M) 2.458 1.421 1.075 0.902 0.799 0.730 0.680 0.643 0.614 0.591 0.573 0.557 0.544The link speed changes from 18.8 kbps to 14.17 kbps for 4 to 7 frames, the link speed only drops in the range of 1 to 2 kbps. The required bandwidth for 4 to 7 frames will between 0.68M to 0.90M
The voice quality, with coding quality and latency control at the gateway, as well as latency and jitter control in the network will depends of no. of frames in the packet. ITU-T G.114 recommendation for end-to delay in a voice network should be 150ms.
To ensure end-to-end QoS for voice traffic while making optimal use of network bandwidth, Manufacturer should offer a comprehensive set of QoS capabilities, will Lucent provides a set of software in this aspects.
30th January 2001 at 19:39 #33202Voip-Calculator.comGuestThere are white papers on our new Web site might help:
Best regards,
Voice over IP Calculator Webmaster.1st February 2001 at 23:15 #33203RommelGuestYour voip bandwidth calculator has the wrong values for G.723.1 The codec comes in 5.3k and 6.3k flavors.
1st February 2001 at 23:28 #33204RommelGuestTo clarify Alex’s message this is using a G.729 codec. At least that is what it looks like. Codec is needed in order to determine your bandwidth.
G.114 also states that ONE way delay should be no longer than 150ms. -
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