Telecommunications - X.25 Glossary


CCITT International Standards body - now ITU-T
CUG Closed user group
DTE Customers terminal equipment
DCE Network end of link
DNIC Data Network Identification Code
GFI General Format Identifier
HEADER Part of Packet which contains control information
ISO International Standards Organization
LCGN Logical Channel Group Number
LCN Logical Channel Number
NSAP Network Service Access Point
NUA Network user address
OSI Open Systems Interconnection
PACKET Data sequence containing control info and in some cases user data
PSE Packet Switching Exchange
Public Network BT Data Network
PVC Permanent virtual circuit
RPOA Recognized Private Operating Agency
SVC Switched Virtual Circuit
UKa Equipment Suppliers for Public Network
X25 CCITT packet terminal interface recommendation
X28 CCITT start-stop terminal interface recommendation
X75 CCITT packet internetwork interface recommendation

INDEX

Adaptive Routing in ARPANET

Adaptive routing strategies

Addressing

CALL ACCEPTED PACKET

CALL CONNECTED PACKET

Call reconnect on trunk failure

Call request delay

CALL REQUEST PACKET

Call Statistics

Call user data

CCITT

Centralised Adaptive Routing

CLEAR CONFIRMATION PACKET

CLEAR INDICATION PACKET

CLEAR PACKET

CLEAR REQUEST PACKET

CUG

DATA PACKET

DATA packet transfer delay

Data transfer - DATA Packet

RR, RNR, REJ

DCE

Disjoint Deterministic Routes

DNIC

DTE

Extended Formats

Facilities

FACILITIES VIA International Public Network

Flooding technique

Floyd's Algorithm

GFI

HEADER

Hierarchical Adaptive Routing

INCOMING CALL PACKET

INTERRUPT CONFIRMATION PACKET

INTERRUPT PACKET

ISO

LCGN

LCN

Logical Channel Group Number

Logical Channel Numbers and Logical Channel Group

Logical Channel Numbers - LCN

Logical Channels

Minimum delay Algorithms

More-data bit

Multiline

Non-ext format to non-ext format

NSAP

NUA

OSI

PACKET

Packet Level initialisation

Packet size negotiation

Procedures

PSE

Public Network

PVC

QOS parameters

Quality of service parameters

Quality-of-service (QOS) parameters

Random Routing

Redirection

REJ PACKET

Reliability in deterministic routing

RESET CONFIRMATION PACKET

RESET INDICATION PACKET

RESET REQUEST PACKET

RESTART CONFIRMATION PACKET

RESTART INDICATION PACKET

RESTART REQUEST PACKET

Reverse Charge

RNR PACKET

Routing algorithms

RPOA

RR PACKET

State table

SVC

UKa

Throughput of X25 links

Throughput

Timers

Transit Delay

Virtual call network

Window size negotiation

X200 - The network layer

X25

X28

X75


TABLE OF CONTENTS

1.3 - Relationship between packet layer and Link layer

1.4 - Link level failure

2 - Procedures

2.5 - Slide NET 32 - Example sending a data packet

3. 1 - Slide INTRO3 - map of Public Network

3.2 - Services provided by network layer

  1. - Net 9
  2. Packet types

4 - Packet headers

4.1 GFI

Call Packet

5.1 CALL REQUEST PACKET

5.1 INCOMING CALL PACKET

5.1 CALL ACCEPTED PACKET

5.1 CALL CONNECTED PACKET

5.2 - slide DATA PACKET

5.2 DATA PACKET

5.3 - slide rr packet

5.3.1 - RR PACKET

5.4 slide rnr packet

5.4.1 RNR PACKET

5.5.1 slide REJ

5.5 REJ PACKET

5.6 slide RESET

5.6 RESET REQUEST PACKET

5.6 RESET INDICATION PACKET

5.6 RESET CONFIRMATION PACKET

5.7 - slide interrupt

5.7 INTERRUPT PACKET

5.7 INTERRUPT CONFIRMATION PACKET

5.8 slide clear

5.8 CLEAR REQUEST PACKET

5.8 CLEAR INDICATION PACKET

5.8 CLEAR CONFIRMATION PACKET

5.9 slide NET 33 - restart

5.9 RESTART REQUEST PACKET

5.9 RESTART INDICATION PACKET

5.9 RESTART CONFIRMATION PACKET

5.9.1 Packet Level initialization

6 - Slide Net 17 ................ Addressing

6 - Addressing

6.2 Network-Layer Addressing

6.1 Slide Net 11 ....... Multiplexing and routing

7 - Logical Channels

7.2 Net 12 .... Multiplexing and routing - logical channels

8 - Virtual call network

8.2 Slide NET 25 ........ LCGN

8.3 Logical Channel Numbers - LCN

8.4 Logical Channel Group Number - LCGN

9 - Logical Channel Nos and Logical Channel Group numbers

10 - Routing algorithms

10.1 Floyd's Algorithm

10.3 Minimum delay Algorithms

10.4 Reliability in deterministic routing

10.5 flooding technique

10.6 Disjoint Deterministic Routes

10.7 Adaptive routing strategies

10.8 Centralized Adaptive Routing

10.9 Random Routing

10.10 Adaptive Routing in ARPANET

10.11 Hierarchical Adaptive Routing

10.12 slide net5 - making a call

10.13 - Call packet - Addresses

10.14 Net 13 ................ Successful call set-up

10.15 Net 14 ................ Unsuccessful call attempt

10.16 Slide NET 26 - subscr time and call setup time facil

11 - Facilities

11.1 slide NET 15 - facilities

11.2 Reverse Charge

11.3 Reverse charge

11.4 - Extended Formats

11.6 Packet size negotiation

11.7 Window size negotiation

11.9 - non-ext format to non-ext format

11.10 non-ext format to ext format

11.11 ext format to non-ext format

11.12 ext format to ext format

11.13 Fast select

11.14 - Slide NET 27 - Closed user group

11.15 - Closed user group

11.16 Slide NET 28 - Call redirection

11.17 Redirection

11.18 Slide NET 29 - Multiline

11.19 Multiline

11.20 Call Statistics

11.21 FACILITIES VIA International Public Network

12 - Quality-of-service (QOS) parameters

12.1 Throughput

12.2 Transit Delay

13 - Call user data

14 - Slide NET 30 - clear causes

14.1 - CLEAR PACKET

15 Slide NET 24 - More-data bit

15 - Data transfer - DATA Packet, RR, RNR, REJ

16 - SLIDE NET 16 Throughput of X25 links

17 Public Network quality of service parameters

17.1 Call request delay

17.2 DATA packet transfer delay

17.3 Established Call Clear

17.4 Spontaneous Resets

18 State table

19 - Timers

20 - Call reconnect on trunk failure

21 - Pract 1 - Decoding packet headers using Halcyon Tester

22 - X200 - The network layer

22.1 FUNCTIONS OF THE NETWORK LAYER

22.2 THE NETWORK LAYER-INTERNAL ARCHITECTURE

22.3 - Connectionless - MODE DATA TRANSFER

22.4 - NETWORK LAYER STANDARDS

22.5 Services provided to the Transport Layer

22.6 Queue model concepts

23 - 1984 per-call facility fields

24 Typical Faults

25 - Questions on network layer

 


 


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