User guide

Video Services provided by ADSL Network Engineering
Telesyn Service Guide (Optimizing Video Services)
3-8
3.2.4.2.4 Example spreadsheet for Calculating Minimum Downstream Rate
The ADSL16 loop calculations are shown in Table 3-2:
TABLE 3-2 Calculating ADSL16 Loop Values
Service Attribute (Used in Calculations) Value Notes
Video Encoder Video Rate 2,900,000 bps Configurable in the encoder
Total Encoder Audio Rate 192,000 bps Configurable in the encoder
Encoder Overhead Rate * 307,320 bps Video PID 0 PAT + Video PID 100
PMT
Video Packet Payload Size 10,528 bits Configurable in the encoder
IP Frame Overhead 336 bits
Total IP Frame Overhead Rate 98,681 bps (((Encoder Video Rate+Total
Encoder Audio Rate)/Video Packet
Payload Size)*IP Frame Overhead)
Number of STBs 2
Video Burst Factor 5% Percentage the video bursts above
encoded rate
EPG Rate 40,000 bps Configurable in the Middleware
Data Guaranteed Rate 256,000 bps
Maximum Possible when video rate
is not bursting to maximum & no
EPG transfer
605,200 bps EPG Rate+Guaranteed
Rate+(Number of STB*((Encoder
Video Rate+Total Encoder Audio-
Rate)*(1+Video Burst factor/100))-
(Encoder Video Rate+Total
Encoder Audio Rate)))
Voice BW per phone
Number of phones