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Transcript 
Background
•
•
•
•
•
•
PSTN/SS7 networking
IP networking
ATM networking
SONET networking
WDM networking
Telephony data model
11/21/99
1
PSTN
Bidirectional DS0 circuit
DS0 lines
TDM
Switch
TDM
Switch
Trunks
T1
•
•
TDM
Switch
TDM
Switch
A T1 (1.5 Kbps) is a time-multiplexed signal of 24 DS0 (64 kbps)
A TDM switch maps bits arriving in one time slot to another time slot on an
output port
11/21/99
2
SS7 network architecture
TDM
Switch
TDM
Switch
Databases
(e.g. 800)
A
B
STP
TDM
Switch
STP
F
TDM
Switch
B
C
TDM
Switch
TDM
Switch
STP
TDM
Switch
11/21/99
STP
TDM
Switch
A
STP: Signal Transfer Point: datagram router
A-F: Types of signaling links
Databases
(e.g. 800)
3
SS7 protocol stack
Switch
I
S
U
P
TCAP
SCCP
11/21/99
STP
SCCP
MTP L3
MTP L3
MTP L2
MTP L2
MTP L1
MTP L1
MTP L3-L1 Message Transfer Part Level 3 to Level 1
TCAP Transaction Capabilities Application Part
SCCP Signaling Connection Control Part
ISUP ISDN User Part
4
MTP L3
• Connectionless (datagram) NL protocol
• Addressing scheme: point code (14 or 24 bits)
MTP L3 Header
MTP L2
SLS
Header
8
11/21/99
OPC
24
DPC
24
Network
Identifier
Network
Cluster
Network
8
8
8
Cluster Member
ISUP or ISUP/SCCP
or TCAP/SCCP
SLS Signaling link Selection
DPC Destination Point Code
OPC Originating Point Code
5
Basic call setup (using ISUP)
SSP
DTMF
Signaling
SSP
SSP
STP
Does MTP L3
packet forwarding
11/21/99
SSP
IAM Initial Address Message
ACM Address Complete Message
ANM Answer Message
6
Call setup with advanced services
(using TCAP)
516-555-1278
Local Carrier
SCP
Long distance carrier
STP
STP
Switch
Switch
Local Carrier
Long Distance
SCP
STP
STP
Switch
Switch
Signaling links
Voice trunks
800-555-4400
11/21/99
STP: Signal Transfer Point
SCP: Service Control Point
SCP
ring
516-555-1278
7
IP protocol stack
11/21/99
8
TCP
11/21/99
9
UDP
11/21/99
10
IP network routing protocols
11/21/99
11
ATM protocol stack
11/21/99
12
Types of AAL
11/21/99
13
Service classes
11/21/99
14
CAC
11/21/99
15
Scheduling
11/21/99
16
ATM addressing
11/21/99
17
ATM signaling
11/21/99
18
ATM network routing protocol
11/21/99
19
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