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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
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SSS Interworking
Figure 8.2
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CSS and RSS
Figure 8.3
RSS
CSSETC
Trunks
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SSS Functional Model
Figure 8.4
Switchingfunctions
Framehandlerfunctions
Maintenance,administrationand operationfunctions
Subscriber accessfunctions
SSS
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Switching functions within SSS
Figure 8.5
Access functions Switching functions
To GSS
To GSS
Time switch
ETB
JTC
PRA
BA
ANSA
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Functions of SCS
Figure 8.6
BA and PRAaccess
Analogue subscriberconnected to the SSS
Semi-permanentconnections
Access parameters
PABX Interface functions
Supplementary servicesand coordination
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SCS interworking
Figure 8.7
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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
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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
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Direct PABX access
Figure 8.10
AXE
2048kbit/s
2048 kbit/sCAS
DCLoop
ETC
ETCRSM
DigitalPABX
AnaloguePABX
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CAS-protocol interface
Figure 8.11
AXE
CSS/RSS
RSM
ESM
Accessproducts
ESM-CAS 2048 kbit/s
ESM-CAS 2048 kbit/s
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ISDN basic access
Figure 8.12
R S/T U AXE
CSS/RSS
TA
NT
LSMBA
160 kbit/s2B+DTE2
TE1
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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
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Hardware structure for PRA
Figure 8.14
PRA
4 x PRA
4 x PRA
PRA
ETC
ETC
LSM
LSM
RPG
RPG
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LE ANLocal Exchange Access Network
(AXE)
V5 Protocol
PSTNSubscribers
ISDNSubscribers
V5 Protocol
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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
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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
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Why V5 ?
Standard Interface (ETSI)Provision of Digital ServicesTo save copper
LE
AN AN
AN
AN
AN
AN
AN
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User Ports
V5 PROVIDES DIFFERENT USER PORTS– PSTN– ISDN BRA – ISDN PRA
ANV5 Protocol
PSTN
ISDN
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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
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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
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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
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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
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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
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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
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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
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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
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CSS, RSS
Figure 8.16
AXE
CSS
RSS
RSM
RSM
NT
NT
GSS
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Access Networks
Figure 8.17
RAS1000
Airline
V5
ISUP
V5
Otheraccesnodes
DIAmuX
RSM
BMX
Access network
Otherexchanges
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Figure 8.18
A B
FSK/DTMF
CIDCalling number
ISUP, TUP/MFC
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Call answering service/message waiting indication
Figure 8.19
AXE
Voicemailbox
FSKTone
DTMF
ISUP, TUP or TCAP
MWI CAS
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Handling of call by DSA on originating side
Figure 8. 32
APSI
APDSA1
2
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Handling of the call by the originating DASAM
Figure 8. 33
APSI
APDSA Message
buffer
34
4
5 6
5
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Handling of the call by the originating IUSAM
Figure 8. 34
APSI
AP
78
10
11
9
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Handling of the call by the XSS
Figure 8. 35
APSI
AP
12
13
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Handling of the call in the terminating IUSAM, DASAMand DSA
Figure 8. 36
APSI
APDSA
14
16
15
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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
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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
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