call flow in pstn

8/ 038 13 - EN/LZU 108 775/1 R1 Internal Training Marievik Proprietary & Confidential 1

Accesses to AXE

Figure 8.1

RSS

RSS

RSS

RAS1000

Freeset

DRA 1900

Cu

Cu

Cu

Minilink

PABX

X.25

FTTC

V5.1

Urban

Suburban

Rural

MUX

DIAmuX

RSM


SSS Interworking

Figure 8.2


CSS and RSS

Figure 8.3

RSS

CSSETC

Trunks


SSS Functional Model

Figure 8.4

Switchingfunctions

Framehandlerfunctions

Maintenance,administrationand operationfunctions

Subscriber accessfunctions

SSS


Switching functions within SSS

Figure 8.5

Access functions Switching functions

To GSS

To GSS

Time switch

ETB

JTC

PRA

BA

ANSA


Functions of SCS

Figure 8.6

BA and PRAaccess

Analogue subscriberconnected to the SSS

Semi-permanentconnections

Access parameters

PABX Interface functions

Supplementary servicesand coordination


SCS interworking

Figure 8.7


Architecture of AXE access hardware

Figure 8.8

CSS

CSS

30B+D PRA

30B+D PRA

CAS-LSM

CAS-LSM

2 Wire PSTN

2 Wire PSTN

V5.1

V5.1

2B+D BA

2B+D BA

30B+D PRA

CAS

LSM

LSM

ESM

ESM ETC

CSR

LSM

LSM ETC

FSK

MTU

MTU ETC

LSM

LSM ETC

RPG

SE

SE ETC

KRDD

LSM

LSM ETC

CSK

ETC

ETC

GSS


EMG structure (ANSA) in a remote subscriber switch

Figure 8.9

LSM-15

EMG

LSM-0

LIC

LIC

KRC

KRC

REU

REU

ETB

ETB

STR

ETC

STC

CP-B

STC

ETCPCM link

PCMlink

RPB

SLCT

SLCT

EMRP

EMRP

TSW

TSW

GSS

CP-A


Direct PABX access

Figure 8.10

AXE

2048kbit/s

2048 kbit/sCAS

DCLoop

ETC

ETCRSM

DigitalPABX

AnaloguePABX


CAS-protocol interface

Figure 8.11

AXE

CSS/RSS

RSM

ESM

Accessproducts

ESM-CAS 2048 kbit/s

ESM-CAS 2048 kbit/s


ISDN basic access

Figure 8.12

R S/T U AXE

CSS/RSS

TA

NT

LSMBA

160 kbit/s2B+DTE2

TE1


ISDN primary rate access (PRA)

Figure 8.13

AXER S T V3

CSS/RSS

TA

NT1

NT2PABX LSM

PRATE2

TE1

LT

Recs.G.962 and G. 963

Primary rateaccess digitalsection

Rec. 1.430Rec. 1.431

Rec. 1.431

ISDN PRA


Hardware structure for PRA

Figure 8.14

PRA

4 x PRA

4 x PRA

PRA

ETC

ETC

LSM

LSM

RPG

RPG


LE ANLocal Exchange Access Network

(AXE)

V5 Protocol

PSTNSubscribers

ISDNSubscribers

V5 Protocol


Functions of “AN”

PSTN LINES– Provide the Line Circuit– Recognition of Line Signals– Provision of Ring Current– Digit reception – Provision of meter pulses

ISDN LINES– Provide the Line Circuit– Provide Layer 1 Activation / Deactivation services

CONNECTIVITY– Perform connections ordered from the LE


Functions of the “LE”

PSTN LINES– Instruct the AN to set line conditions– Recognition of DTMF digits– Provide tones and service announcements– Instruct the AN when to provide meter pulses– Instruct the AN when to provide ring current

ISDN LINES– Instruct the AN when to activate / deactivate layer 1– Control the Isdn layer 3 messages

CONNECTIVITY– Request connections to be performed in the AN – Audit connections in the AN when required


Why V5 ?

Standard Interface (ETSI)Provision of Digital ServicesTo save copper

LE

AN AN

AN

AN

AN

AN

AN


User Ports

V5 PROVIDES DIFFERENT USER PORTS– PSTN– ISDN BRA – ISDN PRA

ANV5 Protocol

PSTN

ISDN


Different V5 Protocols

V5.1– DIRECT ALLOCATION OF SPEECH CHANNELS TO SUBSCRIBERS– NO CONCENTRATION

V5.2 Single Link– NO ASSOCIATION OF SPEECH CHANNELS TO SUBSCRIBERS– ALLOCATION OF SPEECH CHANNELS ON A PER CALL BASIS

V5.2 Multi Link– ALLOWS MULTIPLE LINKS– PROTECTION OF COMMUNICATION CHANNELS


V5.2 (SINGLE LINK) PROTOCOL ONLY A SUBSET OF V5.2 ALLOWS CONCENTRATION

ABILITY OVER V5.1 AXE PROVIDES V5.2

(SINGLE LINK) CAPABILITIES

V5.2 (MULTI LINK) PROTOCOL ALLOWS CONCENTRATION ABILITY PROVIDES PROTECTION FEATURES

FOR THE COMMUNICATION

CHANNELS AXE PROVIDES FULL V5.2

CAPABILITIES

V5 in AXE


V5 Link (Layer 1)

USES 2.048 KBITS DIGITAL LINKS UP TO 31 SPEECH CHANNELS1-3 COMMUNICATION CHANNELS

Layer 1 Synchronisation Communication Channel

Speech Channels (Time-Slots)

CC C

Possible Communication Channels

CONTAINS SPEECH CHANNELS AND COMMUNICATION CHANNELS


V5 Data Links (Layer 2)

V5 differs from other protocols like ISDN– ISDN uses “one” data link– V5 uses a number of data links

LE ANV5 Protocol

Ctrl

Ctrl

Bcc

Pstn

Isdn

Bcc

Pstn

Isdn

Communication Channel

AXE 30B+DISDN Protocol

Lay2 Lay2D Channel


V5.2 SINGLE LINK COMMUNICATION CHANNELS CONSISTS

OF A NUMBER OF DATA LINKS

–CONTROL DATA LINK (CTRL)–BEARER CHANNEL CONTROL PROTOCOL (BCC)–PSTN PROTOCOL (PSTN)–ISDN PROTOCOL (ISDN)

EACH LAYER 2 MESSAGE CONTAINS AN ENVELOPE ADDRESS

THE ENVELOPE ADDRESS SPECIFIES :-

-ISDN PROTOCOL AND ISDN USER PORT-PSTN PROTOCOL-CONTROL PROTOCOL-BEARER CONTROL PROTOCOL

Layer 2


V5 Layer 3 Address (V5DLaddr)

EACH LAYER 2 MESSAGE CONTAINS A LAYER 3 ADDRESS

– THE LAYER 3 ADDRESS IS USED DIFFERENTLY DEPENDING ON THE PROTOCOL– THE LAYER 3 ADDRESS USES DIFFERENT FORMATS FOR PSTN AN ISDN PORTS


System Management

BOTH “LE” AND “AN” IMPLEMENT SYSTEM MANAGEMENT

SYSTEM MANAGEMENT CONTROLS :-– Activation and supervision of the layer 2 Data Links– System Start-up

BOTH “LE” AND “AN” MUST PERFORM A V5 START UP BEFORE CALLS ARE

ALLOWED – Start of layer 2 Data Links– Exchange of Variant and Identity– EACH “AN” CONNECTED TO A “LE” HAS A SEPARATE V5 IDENTITY– Restart of PSTN– De-blocking of Ports


V5.1 and V5.2 interface implementations in AXE

Figure 8.15

ISDN BA

ISDN BA

PSTN

PSTN

ISDN PRA

ISDN PRA

V5.1 or V5.2

V5.1 or V5.2

ETC

ETC

Accessnode

Accessnode

RSS

RSS

RPG

RPG


CSS, RSS

Figure 8.16

AXE

CSS

RSS

RSM

RSM

NT

NT

GSS


Access Networks

Figure 8.17

RAS1000

Airline

V5

ISUP

V5

Otheraccesnodes

DIAmuX

RSM

BMX

Access network

Otherexchanges


Figure 8.18

A B

FSK/DTMF

CIDCalling number

ISUP, TUP/MFC


Call answering service/message waiting indication

Figure 8.19

AXE

Voicemailbox

FSKTone

DTMF

ISUP, TUP or TCAP

MWI CAS


Call handling configuration for PSTN

Figure 8.20

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Call reception

Figure 8. 21

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLC OF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Interrogating the subscriber data

Figure 8. 22

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLC OF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Allocation of storage space

Figure 8. 23

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS

Tone


Digit Reception

Figure 8. 24

Digits

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLC OF CHAPCJ

C7LABT

JT GS

CHPU LSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Digit analysis

Figure 8. 25

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Selection of trunk and group switch path

Figure 8. 26

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Digit sending

Figure 8. 27

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLC OF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Acknowledgement reception

Figure 8. 28

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Completion of call set-up

Figure 8. 29

LIC

KRC

JTCST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Call supervision and charging

Figure 8. 30

LIC

KRC

JTCST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLCOF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Clearing the call

Figure 8. 31

LIC

KRC

JTC ST-7

ETC

LI2

TS C7ST

RE

RA

BT

KR2 C7DR

DASC CLC OF CHAPCJ

C7LABT

JT GS

CHPULSE

GSTSW

SSS

SCS CHSTCS

GSS

CCS

TSS


Handling of call by DSA on originating side

Figure 8. 32

APSI

APDSA1

2


Handling of the call by the originating DASAM

Figure 8. 33

APSI

APDSA Message

buffer

34

4

5 6

5


Handling of the call by the originating IUSAM

Figure 8. 34

APSI

AP

78

10

11

9


Handling of the call by the XSS

Figure 8. 35

APSI

AP

12

13


Handling of the call in the terminating IUSAM, DASAMand DSA

Figure 8. 36

APSI

APDSA

14

16

15


Basic call establishment

Figure 8. 37

DSS1

C onnectack

C onnect

A lerting

C onnect

A lerting

D S A D S AXS S

C onnect

A lerting

C onnect

A lerting

C onnect

A lerting

C onnect

A lerting

A N M

A C M

A N M

A C M

C onnectack

C onnectack

C onnectack

C onnectack

C onnectack

A-sub B-sub

DSS1 DSS1 DSS1 DSS1DSS1 ISU P ISU P


Release of the call from the A-side

Figure 8. 38

D S S 1

Relcom p

Release

Dis-connect

Release

Dis-connect

DSA DSAXSS

Release

Dis-connect

Release

Dis-connect

Release

Dis-connect

Release

Dis-connect

RLC

REL

RLC

REL

Relcom p Relcom p Relcom p Relcom p Relcom p

A -sub B -sub

D S S 1 D S S 1 D S S 1 D S S 1D S S 1 IS U P IS U P

call flow in pstn

Documents

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v5 protocol

communication

speech channels

single link