pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 372

• Manufacturer Part Number: pef20550
• Description: Extended Line Card Interface Controller Elic
• Manufacturer: Infineon Technologies Corporation

The following table 52 gives these delay times for a variety of competing subscribers and
HDLC frame lengths:
Table 52
Average Delay Times for the S
Average Length of
HDLC Frames
(in Byte)
5
10
20
40
80
200
500
1000
2000
As has been shown theoretically, the maximum (worst case) delay time is twice the
average delay time for any set of subscribers and frame lengths, whereas the minimum
delay time is always 0 s. The following example shows how to interpret table 52.
Example:
For the system of figure 127,
let n = 32 (total number of enabled subscribers),
let the average HDLC frame length = 20 Byte.
Assume that, during peak traffic times (e.g 10 a.m.), an average of 10 subscribers
wishes to send data to the SACCO-A concurrently. Then the average delay for access
to the SACCO-A will be 61.03 ms. The worst case delay will be 122.06 ms, whereas the
minimum delay will be 0 ms.
Assume that, during times of little demand (e.g 10 p.m.), an average of 2 subscribers
wishes to send data to the SACCO-A concurrently. Then the average delay for access
to the SACCO-A will be 6.78 ms. The worst case delay will be 13.56 ms, whereas the
minimum delay will be 0 ms.
Average waiting times in the example system will thus vary between 61.03 ms and
6.78 ms.
Semiconductor Group
1
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2
2.80
4.13
6.78
12.09
22.72
54.59
134.28 268.56
267.09 534.19
532.72 1065.44 2130.88 4794.47 10121.7 16514.3
0
Application of Figure 127 (in ms)
3
5.59
8.25
13.56
24.19
45.44
109.19
Number of Subscribers
372
5
11.19
16.50
27.13
48.38
90.88
218.38
537.13
1068.38 2403.84 5074.78 8279.91
10
25.17
37.13
61.03
108.84
204.47
491.34
1208.53 2551.34 4162.72
20
53.14
78.38
128.84
229.78
431.66
1037.28 1692.41
Application Notes
PEB 20550
PEF 20550
127.88
32
86.70
210.22
374.91
704.28
01.96