Circuit Emulation VLL (Cpipe) Services
Page 150 7705 SAR OS Services Guide
Calculation of Packetization Delay
Packetization delay is the time needed to collect the payload for a CESoPSN packet. DS1
and E1 frames arrive at a rate of 8000 frames per second. Therefore, the received frame
arrival period is 125 μs.
In the previous example, 16 frames were accumulated in the CESoPSN packet. In this case,
the packetization delay (D) can be calculated as follows:
D = 125 μs/frame × 16 frames
= 2.000 ms
Table 19 shows the default and minimum values for frames per packet, payload size, and
packetization delay as they apply to the number of timeslots (N) that contribute to the packet
payload. The default values are set by the operating system as follows:
• for N = 1, the default is 64 frames/packet
• for 2 ≤ N ≤ 4, the default is 32 frames/packet
• for 5 ≤ N ≤ 15, the default is 16 frames/packet
•for N ≥ 16, the default is 8 frames/packet
Table 19: Default and Minimum Payload Size for CESoPSN without CAS
Default Values Minimum Values
Number of
Timeslots
(N)
Frames
per Packet
(F)
Payload Size
(Octets)
(S)
Packetization
Delay (ms)
(D)
Frames
per Packet
(F)
Payload Size
(Octets)
(S)
Packetization
Delay (ms)
(D)
1 64 64 8.000 2 2 0.250
2 32 64 4.000 2 4 0.250
3 32 96 4.000 2 6 0.250
4 32 128 4.000 2 8 0.250
5 16 80 2.000 2 10 0.250
6 16 96 2.000 2 12 0.250
7 16 112 2.000 2 14 0.250
8 16 128 2.000 2 16 0.250
9 16 144 2.000 2 18 0.250
10 16 160 2.000 2 20 0.250
11 16 176 2.000 2 22 0.250
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