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ISSUEISSUE
Fixed Network Curriculum
Development Section
Fixed Network Curriculum
Development Section
OAX001103 Signaling and Protocol Processing
OAX001103 Signaling and Protocol Processing
2.02.0
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ReferencesReferences
U-SYS SoftX3000 Architecture & Principle(V3.06)
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ObjectivesObjectives
Understand the signaling processing
path
Upon completion of this course, you will be able to:
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Course ContentsCourse Contents
Chapter 1 Processing Path for Signaling over IP
Chapter 2 Processing Path for Signaling over TDM
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Protocol stack of FCCU/FCSU/BSGI/MSGIProtocol stack of FCCU/FCSU/BSGI/MSGI
SCCP
ISUP
MSGI
FCCU
TCAP
M2UA
M3UA
SCTP UDP TCP
INAP MGCP H.248 H.323SIP
IUA
DSS1
IP
MTP3
MTP2
MTP1 UDP
IP
FCSU
BSGI
EPII V5UA
V5.2
H.323 RAS H.323 CALLMGCPStack
H.248Stack
IUA
V5UA
M3UA
R2
SIP Stack
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Signaling over IPSignaling over IP
ISUP/INAP over MTP3/M2UA
ISUP/INAP over M3UA
DSS1 over IUA
V5.2 over V5UA
MGCP/H.248 over UDP
H.323 over IP
SIP over UDP
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Signaling Processing Path for ISUP/INAP/DSS1/V5.2
Signaling Processing Path for ISUP/INAP/DSS1/V5.2
SMUI
SIUI
HSCI
BFII
SIUI
BFII
IFMI
SMUI
IFMI
HSCI
Ethernet bus
Shared resource bus
Core LAN Switch Core LAN Switch
FE FE
Frame A
BSGI
BSGI
FCCU
FCCU
FEFE
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Signaling Processing for ISUP/INAP/DSS1/V5.2
Signaling Processing for ISUP/INAP/DSS1/V5.2
1. The BFII provides an IP interface to receive IP packets, processes physical-layer
messages, and transfers the packets to an IFMI through a fixed connection.
2. The IFMI processes the MAC messages, and subsequently dispatches them to a
designated BSGI through the Ethernet bus for further processing. That is level-1
message dispatch, also called bearer signaling message dispatch.
3. The BSGI processes IP, UDP, SCTP, M2UA, M3UA and V5UA messages, then
sends the messages to FCCU/FCSU through Ethernet bus. That is level-2
message dispatch.
4. FCCU/FCSU processes the service messages.
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Signaling Processing for MGCP/H248-UPSignaling Processing for MGCP/H248-UP
SMUI
SIUI
HSCI
BFII
SIUI
BFII
IFMI
SMUI
IFMI
HSCI
Ethernet bus
Shared resource bus
Core LAN Switch Core LAN Switch
FE FE
Frame A
BSGI
FCCU
FCCU
BSGI
FEFE
CDBI
CDBI
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Signaling Processing for MGCP/H248_DOWNSignaling Processing for MGCP/H248_DOWN
S
M
U
I
S
I
U
I
H
S
C
I
B
FI
I
S
I
U
I
B
F
I
I
I
F
M
I
S
M
U
I
I
F
M
I
H
S
C
I
Ethernet bus
Shared resource bus
Core LAN Switch Core LAN Switch
FE FE
Frame A
B
S
G
I
B
S
G
I
F
C
C
U
F
C
C
U
IPIP
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Signaling Processing for MGCP/H248Signaling Processing for MGCP/H248
1. The BFII provides an external IP interface to receive IP packets communicated
with media gateways, processes physical-layer messages, and transfers the
packets to an IFMI through a fixed connection.
2. The IFMI processes MAC messages, and subsequently dispatches them to a
BSGI through the Ethernet bus according to BSGI function configuration and
load-sharing principle.
3. The BSGI processes MGCP/H.248 lower-layer protocol messages, and
subsequently dispatches them to a CDBI capable of dispatching MGCP/H.248
messages.
4. CDBI queries the correspondence table between media gateway domain name
and pertaining FCCU/FCSU module number, and subsequently transfers
messages to the FCCU/FCSU module responsible for managing the gateway or
termination.
5. The FCCU/FCSU processes the MGCP/H.248 messages.
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Signaling Processing Path for H.323/SIPSignaling Processing Path for H.323/SIP
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1. The BFII provides an IP interface to receive IP packets, processes
physical-layer messages, and transfers the packets to an IFMI
through a fixed connection.
2. The IFMI processes the MAC messages, and subsequently
dispatches them to a designated MSGI through the Ethernet bus
for further processing. That is level-1 message dispatch, also
called bearer signaling message dispatch.
3. The MSGI processes IP, UDP, TCP, H.323 RAS, H.323 CALL and
SIP messages, then sends the messages to FCCU/FCSU through
Ethernet bus. That is level-2 message dispatch.
4. FCCU/FCSU processes the service messages.
Signaling Processing for H.323/SIPSignaling Processing for H.323/SIP
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Course ContentsCourse Contents
Chapter 1 Processing Path for Signaling over IP
Chapter 2 Processing Path for Signaling over TDM
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Protocol stack of FCCU/FCSU/BSGI/MSGIProtocol stack of FCCU/FCSU/BSGI/MSGI
SCCP
ISUP
MSGI
FCCU
TCAP
M2UA
M3UA
SCTP UDP TCP
INAP MGCP H.248 H.323SIP
IUA
DSS1
IP
MTP3
MTP2
MTP1 UDP
IP
FCSU
BSGI
EPII V5UA
V5.2
H.323 RAS H.323 CALLMGCPStack
H.248Stack
IUA
V5UA
M3UA
R2
SIP Stack
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Normal processing path for signaling over TDMNormal processing path for signaling over TDM
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Normal processing for signaling over TDMNormal processing for signaling over TDM
1. The E1 interface of an EPII provides a TDM PCM interface to
access standard 64-kbit/s or 2-Mbit/s SS7 signaling links. T
he EPII processes MTP1 messages, extracts signaling time
slots, and transmits them to the FCSU through internal HWs.
2. The FCSU processes both MTP2 and MTP3 messages, then
transfers the user layer messages to a designated FCCU/FC
SU for further processing.
3. FCCU/FCSU processes the user layer messages.
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Standby processing path for signaling over TDMStandby processing path for signaling over TDM
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