Eicon Networks S52 Guia do Utilizador descarregar pdf (Página 65)

Eicon Connections for Linux User’s Guide

page 63

Packet size

The packet size for transmissions from the remote DTE is shown in the low nibble of the first

octet in the parameter field. The packet size for transmissions from the local DTE is indicated

in the low nibble of the second octet. The high nibble of each octet must be zero.

The four bits indicating packet size are binary-coded as follows:

Note: Some networks may offer a subset of these values. Default packet size is 128 bytes.

Window Size

The window size for transmissions from the remote DTE is represented in bits 6 to 0 of the

first octet in the parameter field. The window size for transmissions from the local DTE is

represented in bits 6 to 0 of the second octet. Bit 7 of each octet must be 0.

The bits referring to window size are binary coded and directly indicate the size of the window.

Closed User Group (CUG) Selection 3,CUG index

Flow Control Negotiation (packet

size)

42,insize,outsize

Flow Control Negotiation (window

size)

43,insize,outsize

Network User Identification (NUI) C6,NUIlength,NUI

Packet Size Codes Packet Size Codes

Code Octets Code Octets

0100 16 1000 256

0101 32 1001 512

0110 64 1010 1024

0111 128 1011 2048

1100 4096

User Facility Code

7 345

010

012

Size Code (Remote)

Size Code (Local)

Code

Octet 1

Octet 2

Bit

Flow Control (Packet Size)

1 0

7 345

110

012

Window Size (Remote)

Window Size (Local)

Code

Octet 1

Octet 2

Bit

Flow Control (Window Size)

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 90 91

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