HP General IO Connectivity manual Example

Installation

Before you Install the software

Shortcut Method Assuming B = P for all VCs, TM can be rounded to:

•If B < 512, TM = approx. (1,536 + (2 x W + 2) x B) x No. of VCs

•If B > or = 512, TM = approx. (2 x W + 5) x B x No. of VCs The following table (in bytes/VC) provides a quick guide:

Table 2-1

			Buffer Size (B) = Packet Size (P) in bytes
			128	256	512	1024	2048	4096
	Window (W)	1	2 K	2.5 K	3.5 K	7 K	14 K	28 K
	size
		2	2.3 K	3 K	4.5 K	9 K	18 K	36 K
		3	2.5 K	3.5 K	5.5 K	11 K	22 K	44 K
		4	2.8 K	4 K	6.5 K	13 K	26 K	52 K
		5	3 K	4.5 K	7.5 K	15 K	30 K	60 K
		6	3.3 K	5 K	8.5 K	17 K	34 K	68 K
		7	3.5 K	5.5 K	9.5 K	19 K	38 K	76 K
Example 2-1	Example:

A system has two X.25 cards configured as follows:

Card 1:

Window = 2 Packet size = 1024

Socket buffer size = 4096 (default) 200 VCs are used

Card 2:

Window = 4 Packet size = 128

Socket buffer size = 4096 (default) 400 VCs are used

26 Chapter 2