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Hodnocené. / 5. Na základě hodnocení zákazníků
Eicon Connections for Linux User’s Guide
page 75
APPENDIX B
X.29 Call User Data Format
An overview of the Call User Data formats used in X.25 calls is provided in this section. It
shows how to format user data for X.25 call clearing.
The format for Call User Data consists of four protocol identifier octets followed by a maximum
of 12 octets of the call user data. Octets consist of bits numbered 7 to 0, where bit 0 is the
low order bit and is transmitted first. Octets are consecutively numbered starting from 1 and
are transmitted in this order.
See below for information on how bit 0 relates to bits 6 &7 of octet 1
Protocol Identifier octet 1 details are shown below:
When bits 7 and 6 are 00, bits 5 to 0 are 000001 to indicate PAD messages relating to the
PAD facility for the start-stop mode DTE. Other coding of bits 5 to 0 is reserved for future
standardization by the CCITT, subject to the rules of Recommendation X.244.
All bits of octets 2, 3, and 4 are set to 0. These octets are reserved for future use to provide
the called PAD or packet mode DTE with additional information pertinent to the calling party.
Octets of the call data field will contain the user characters received by the PAD from the
start-stop mode DTE during the call establishment phase. The coding of these octets is similar
to that of user sequences. The call data field is limited to 12 octets.
6
0 0
7 345 012
Octet
1
Protocol ID
Octet
2
Protocol ID
Bit
Call User Data
00 0000
Octet
3
Protocol ID
Octet
4
Protocol ID
Octet
5
User Data
User Data
...
...
Octet
16
User Data
User Data
0 000 0000
0 000 0000
See "Protocol ID (octet 1) Detail" below
67 345 012
Bit
Protocol ID (octet 1) Detail
0 100 0000
Bit Values
11
01
10
Future Use
Description
for CCITT use re: PADs
for national use
reserved for international user bodies
for DTE-DTE use
- User’s Guide 1
- page 4 4
- Contents 5
- About this Guide 7
- Typographic Conventions 8
- CHAPTER 2 9
- Eiconcard Services 10
- Eiconcard Host PAD Driver 11
- Eiconcard Terminal PAD Driver 11
- Eiconcard Routing Services 12
- Eiconcard SNMP Services 13
- Integrating with OSI 13
- OSI Model 14
- For More Information 15
- page 14 16
- CHAPTER 3 17
- Completing the Installation 18
- Removing Eiconcard Router 18
- Removing Eiconcard Services 19
- Introduction 19
- Install an Eiconcard 19
- Uninstall an Eiconcard 20
- Configure Eiconcard Protocol 20
- High-Level Services 21
- Line Protocols 21
- Dialer Selection 21
- Changing Protocol Parameters 22
- Eiconcard Memory Requirements 22
- Online Help 23
- Configuration Procedure 24
- Configure Advanced Options 25
- Configure the PAD 25
- page 24 26
- Terminal PAD 27
- page 26 28
- Using tpad with cu and uucp 29
- The cu Commands 30
- page 30 32
- X.3 PAD Parameters 33
- The uucp Configuration Files 33
- Using uucp and cu 34
- page 34 36
- CHAPTER 5 37
- page 36 38
- Load the mpr.if file 40
- IP Routing Tables 40
- Displaying IP-routing Entries 42
- Testing Your Installation 42
- The Test System 43
- Resources for the Test System 43
- The Addressing Scheme 43
- Configuring the Eiconcards 44
- Creating an X.25 Test Circuit 45
- Troubleshooting 46
- Setting Up a PPP Connection 48
- page 48 50
- page 50 52
- page 52 54
- CHAPTER 6 55
- Load/Self-test Timeout Period 56
- Watchdog Wake Up Period 56
- X.25 socket driver 56
- Modem and Null-Modem Cables 57
- Establishing Contact 58
- Modem Cables 59
- HSI/V.24 Converter 60
- Null-Modem Cables 61
- X.21 HSI Null-Modem Cable 62
- References 63
- Facility Types 64
- Facility Syntax 64
- Examples of User Facilities 64
- Packet size 65
- Window Size 65
- Fast Select 66
- Throughput Class Negotiation 66
- Bilateral CUG Selection 68
- Reverse Charging 68
- Priority Traffic: 0,0,1,1 69
- Traffic: 69
- 1,1,0,0,1,1 69
- Networks and DNICs 70
- X.25 Diagnostic Codes 71
- page 70 72
- X.25 Cause Codes 73
- ASCII Control Codes 74
- page 74 76
- X.29 Call User Data Format 77
- page 76 78
- Key Packet Formats 79
- Call Accepted Packet Format 80
- Clear Request Packet Format 81
- 2:n Echo 85
- 5:n Auxiliary Device Control 85
- page 84 86
- 8:n Discard data 87
- 9:n Carriage return padding 87
- 10:n Line folding 87
- 11:n Communication speed 87
- 15:n Editing 88
- 14:n Linefeed padding 88
- 16:n Character delete 89
- 17:n Line delete 89
- 18:n Line redisplay 89
- 19:n Editing service signals 89
- 20:n Echo mask 90
- 21:n Parity treatment 90
- 22:n Page wait 90
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