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ISSUEISSUE
Fixed Network Curriculum
Development Section
Fixed Network Curriculum
Development Section
UA0100 SG7000 Hardware StructureUA0100 SG7000 Hardware Structure1.11.1
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Lesson GoalLesson Goal
Know about the hardware structure and
logical structure of the SG7000
Understand the working principles of the
SG7000 boards
Master the SG7000 service flow and
configuration
After this lesson, you can
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Lesson ContentsLesson Contents
Chapter 1 SG7000 Hardware Structure
Chapter 2 SG7000 Logical Structure
Chapter 3 SG7000 Message Flow
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Chapter 1 SG7000 Hardware StructureChapter 1 SG7000 Hardware Structure
Section 1 Service Shelf Configuration
Section 2 Board Introduction
Section 3 Hardware Working Principle
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CabinetCabinet
The SG7000 uses IEC-standard B68-21 cabinet, with
dimensions 2100 mm × 600 mm × 800 mm (H × W × D).
The main control cabinet is configured with one BAM server,
two Ethernet LAN switches (for internal connection), one LCD
display switcher and one or two service shelves.
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Main Control Cabinet in Full ConfigurationMain Control Cabinet in Full Configuration
B68-21 cabinet in full configuration
DC distributor box
2U
14U
14U
2U
LAN Switch 1LAN Switch cabling frame
2U
2U
1U1U
BAM server
Service shelf
Service shelf
LAN Switch cabling frameLAN Switch 0
LCD display switcher
Dummy panel
Dummy panel
1U1U
1U1U
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Service Shelf Configuration (1)Service Shelf Configuration (1)
The configurations of a single shelf are shown
below, where the grey ones are back boards:
EPII
EPII
EPII
EPII
EPII
VIEB
HBIU
HSCU
HBIU
HSCU
VIEB
EPII
EPII
CKII
CKII
SBPU
SBPU
SBPU
SBPU
SBPU
SBPI
HSYS
HSYS
SBPI
SBPU
SBPU
ALUI
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TDM interface
IP interface
CKII
VIEB
HSYS
HBIU
PSTN
HCOMSCBVcascading
EPII
WS oriManager N2000
SoftX3000
M2PA/M3UA
8k/2M Clock
Relationship of SG7000 Boards
IP
CCS7 64k/2M
MML/SNMP
1*100M Ethernet
HSCU
SBPU
8 E1/T1
ALUI
SBPI
Front board
Back board
10M/100M Ethernet
Lan Switch10M/100M Ethernet
Pinch board is SLPU
16 *Slave frame
BAM
Lan Switch
BUS
M2PA/M3UA
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Service Shelf Configuration (2)Service Shelf Configuration (2)
Configuration of cascaded shelves
Figure of the master service shelf in case of cascaded shelves
EPII
EPII
EPII
EPII
VIEB
SCBU
HBIU
HSCU
HBIU
HSCU
SCBU
VIEB
EPII
CKII
CKII
SBPU
SBPU
SBPU
SBPU
SBPI
HCOM
HSYS
HSYS
HCOM
SBPI
SBPU
ALUI
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Service Shelf Configuration (3)Service Shelf Configuration (3)
Figure of the slave service shelf in case of cascaded shelves
EPII
EPII
EPII
EPII
V IEB
SCBU
HBIU
HSCU
HBIU
HSCU
SCBU
V IEB
EPII
EPII
EPII
EPII
SBPU
SBPU
SBPU
SBPU
SBP I
HCOM
HSYS
HSYS
HCOM
SBP I
SBPU
SBPU
SBPU
SBPU
ALUI
There aren’t CKII Board in slave shelves.Usually two frame need a pair of SBPI/VIEB board.A pair of VIEB need one IP address.
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Chapter 1 SG7000 Hardware StructureChapter 1 SG7000 Hardware Structure
Section 1 Service Shelf Configuration
Section 2 Board Introduction
Section 3 Hardware Working Principle
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HSYS FunctionHSYS Function
HSYS is the System board of the SG7000 and works in the 1 +
1 backup mode.
High-speed bus configuration and status management
Communicating with interface board through high-speed bus
Managing all boards in the service processing shelf and
feeding back the statuses to the background
Communicating with background through Ethernet interface
Implementing system loading and management functions
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HSYS InterfaceHSYS Interface
The HSYS interface is shown below:
Type Parameter Index Remarks
RS232 serial interface1
For debugging purpose, with panel RJ45 socket and hot-plugging protection
RS422 master/slave serial interface 1
Communicating with EPII, ALUI, CKII and SCBU
RS485 serial interface 2
Working with HBIU to provide back physical interface
Interface
10/100M Ethernet interface
1
Working with HBIU to provide back physical interface
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HSYS IndicatorHSYS Indicator
The functions of the HSYS indicators are as follows:
Indicator Color Note Meaning Normal status
FAIL indicator
Yellow 1 For board fault
Off when board is normal, On when board is faulty
Yellow 1 For board working status
Flashing when board is normal (1 s on and 1 s off)
DOMADOMB indicator
Green 1 each For high-speed bus status
Both are on for active HSYSBoth are off for standby HSYS
RUN indicator
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HSCU FunctionsHSCU Functions
HSCU is the hot-plugging(Switch) Control board of the SG7
000, controlling board hot-plugging function. It is configured wit
h HSYS in pairs.
It is a back board.
It is not hot-pluggable.
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HSCU IndicatorHSCU Indicator
HSCU indicators are explained as below:
Indicator Color Note Meaning Normal status
DOMADOMBindicator
Green 1each
For high-speed bus status
When both are on, the HSYS that is in pairs with the HSCU is active; otherwise, it is standby
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CKII FunctionsCKII Functions
CKII is the Clock board of the SG7000, inserted in the master service shelf
and occupying two slots. It provides level-2 standard synchronization clock
for the SG 7000 system, working in 1+1 backup mode.
The SG7000 is configured with only one pair of CKIIs.
Clock reference has 2M Bit/s (input from BITS Device), connect to BITS Port.
2M Hz (input 2M-A/B form EPII board ), connect to LINE Port.
8K (output interface ), connect to other slave frames.
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CKII Specifications and InterfacesCKII Specifications and Interfaces
Type Parameter Index Remarks
Providing BELLCORE GR-1244 CORE complaint level-2
clock, ITU-T G.812 Type II clock, and the clock signal
according to the level-2 node clock requirements in Digital
Synchronous Network Node Clock Series and Timing
Characteristics and Digital Synchronous Network
Independent Node Slave Clock Equipment Specifications
and Test Method by MII.
Function
Supporting the SMM function required by ITU-T G.781 and
Digital Synchronous Network Independent Node Slave
Clock Equipment Specifications and Test Method of MII.
The external synchronous clock interface meets the
requirements in ITU-T G.703 and ITU-T G.704 templates.
2M BITS clock
input interface
2 Connected with BITS clock
equipment
2M LINE clock
input interface
2 Connected with EPII
Interfaces
8KHz clock
output interface
16 Providing clock for local EPII
and the communication
between shelves
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CKII Panel and Indicator CKII Panel and Indicator
A RST button is on the panel.
The meanings of the indicator are as follows:
Indicator Color Note Meaning Normal status
FAIL indicator
Yellow 1 For error status
When it is on, this board is resetting or in error.
RUN indicator
Green 1For running status
Flashing at 4Hz in loading program
ACT indicator
Yellow 1 For active/ standby status
On for the active status
Off for the standby status
Flashing at 1Hz in normal running
Flashing at 0.5Hz for standby status
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SBPU FunctionsSBPU Functions
SBPU is the Broadband Signaling Processor board of the SG7
000. As the basic signaling processor unit, it processes No. 7 s
ignaling and SIGTRAN protocol. Two SLPUs are pinched on t
his board.
SBPU provide the TDM Singnaling Interface process, it can pro
cess 64kbps or 2Mbps Link.
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SBPU InterfaceSBPU Interface
SBPU interface
Type Parameter Index Remarks
InterfaceRS232 serial interface 1
For debugging purpose, with panel RJ45 socket and hot-plugging protection.
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SBPU Panel and IndicatorsSBPU Panel and Indicators
The board has a reset button RST on the panel.Indicator Color Note Meaning Normal status
RUN Green 2 For SLPU pinch board working status
It is flashing normally (1 s on and 1 s off) when the SLPU pinch board is normal. It is off when the board is abnormal.
ALM Yellow 2 For SLPU pinch board link status
It is flashing fast (5 times /second) when SLPU is not configured at background. It is off when the board is configured and link is configured. When the SLPU is configured, link is configured but the link is not located, it is flashing slowly (1 time/second). When the board is configured, link is configured and link is located, it is off.
FAIL indicator Yellow 1 For board fault If is off when the board is normal, and off when the board is faulty.
RUN indicator Green 1 For SBPU working status
It is flashing (1 s on and 1 s off) when the board is in normal status. It is flashing fast at 4Hz in loading.
Hot-plugging indicator
Blue 1 For hot-plugging It is on when the board is inserted into shelf and before the power-on, and it is also on when the board is unplugged from the shelf.
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SLPU FunctionsSLPU Functions
It is the universal No. 7 signaling processing board (pinch board
of SBPU), and each SLPU can process 16 * 64K signaling links or
can process one 2M high-speed signaling links.
There are 2 SLPU in one SBPU Board at most. So that there
are 32*64K signaling links or can process 2*2M high-speed
signaling links totally.
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SBPI FunctionsSBPI Functions
As the broadband signaling distributor board of the S
G7000, SBPI implements the LAN drive of Broadband
Interface and IP distributor unit functions, working in t
he 1+1 backup mode.
SBPI provide the IP Singnaling Interface process.
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SBPI InterfaceSBPI Interface
SBPI interface
Type Parameter Index Remarks
Interface
RS232 serial interface 1For debugging purpose, with panel RJ45 socket and hot-plugging protection.
10/100M Ethernet interface 1
Working with VIEB to provide back physical interface
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SBPI IndicatorsSBPI Indicators
SBPI indicators
Indicator Color Note Meaning Normal status
LINK indicatorGreen 1
For network connection
ACT indicatorGreen 1 For network
interface data traffic
Yellow 1 For error status
Green 1 For running status
Blue 1
For hot-plugging
Fail indicator
Run indicator
Hot-plugging indicator
It is on when the physical connection is normal, and is off in other cases.
It is flashing in case of data transmitting/receiving, and the flashing frequency indicates the data traffic
It is on when the board is resetting or in error.
Flashing at 4 Hz in loading programFlashing at 1 Hz in normal runningFlashing at 0.5 Hz for standby status
During the board is inserting in the subrack, the blue indicator is on, indicating that the board contacts the backplane. Here, the handle on the front panel can be used to insert the board completely into the backplane. When the board is to be unplugged, pull out the handle on the front panel, and then the blue indicator is on, indicating that the board is ready for unplugging.
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HCOM FunctionsHCOM Functions
HCOM is front board for the shelf interconnection in the
SG7000. it provides the cascading function of the system
service processing shelves, working in load-sharing or 1+1
backup mode.
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HCOM InterfaceHCOM Interface
HCOM interface
During the operation of the board, the RST button cannot be
pressed at will, lest the normal system operation is affected.
Type Parameter Index Remarks
RS232 serial interface 1 For external configuration debugging purpose
Interface10M/100M self-adaptive network interface
2 Working with SCBU to provide back physical interface
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HCOM IndicatorHCOM Indicator
HCOM running indicator
Indicator Color Note Meaning Normal status
LINK indicator Green 2
ACT indicator Green 2
F A IL indicator Yellow 1
RUN indicator Green 1
Blue 1
Hot-plugging indicator
For network connection
For network interface data traffic
For error status
For running status
For hot-plugging
It is on when the physical connection is normal, and is off in other cases.
It is flashing in case of data transmitting/receiving, and the flashing frequency indicates the data traffic
It is on when the board is resetting or in error.
It is flashing (1 s on and 1 s off) when the board is in normal status, and fast flashing at 4 Hz in loading.
It is on when the board is inserted into shelf and before the power-on, and it is also on when the board is unplugged from the shelf.
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ALUI FunctionsALUI Functions
ALUI is the monitoring board of the SG7000, in slots 16 of the service processing shelf. It indicates the system status and reports the Alarm information from other sources.
It monitors the back board fault and in-position statuses. It is connected with the equipment management board through differential serial
interface, reports the collected information, and receives commands from equipment management board for controlling indicators.
It detects the shelf temperature and sends the data to equipment management board through differential serial interface.
It collects fault detection signals and in-position signals from three power modules, synthesizes them logically, and reports them to the equipment management board as the power system working status.
When the temperature sensor does not work normally, it reports error message, and the board FAIL indicator is on at the same time.
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ALUI InterfaceALUI Interface
ALUI interface
Type Parameter Index Remarks
InterfaceRS232 serial interface 1
When the board J5 and J7 are configured for shorting modules, this serial interface is used as a RS422 serial interface to connect the HSYS. When J6 and J7 are configured for shorting modules, this serial interface is used as a standard RS232 serial and is led out from the front panel.
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ALUI IndicatorsALUI Indicators
ALUI indicators
Location Color Note Meaning Status description
Red Green Off
RUN indicator Green/red 1 For board running
Fault with the communication with HSYS
Normal running Fault with board
00 Green/red 1 For back board status
Fault with board Normal running Board not in position
01 Green/red 1 For back board status
Fault with board Normal running Board not in position
02 Green/red 1 For back board status
Fault with board Normal running Board not in position
03 Green/red 1 For back board status
Fault with board Normal running Board not in position
04 Green/red 1 For back board status
Fault with board Normal running Board not in position
05 Green/red 1 For back board status
Fault with board Normal running Board not in position
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ALUI IndicatorsALUI Indicators
ALUI indicator
Location Color Note Meaning Status description
Red Green Off
RUN indicator
Green/red 1 For board running Fault with the communication with HSYS
Normal running Fault with board
10 Green/red 1 For back board status Fault with board Normal running Board not in position
11 Green/red 1 For back board status Fault with board Normal running Board not in position
12 Green/red 1 For back board status Fault with board Normal running Board not in position
13 Green/red 1 For back board status Fault with board Normal running Board not in position
14 Green/red 1 For back board status Fault with board Normal running Board not in position
15 Green/red 1 For back board status Fault with board Normal running Board not in position
PWR Green/red 1 For the statuses of three power modules
All of the three power modules are in position, but one is faulty.
All of the three power modules are in position and are working normally.
None of the three power modules is in position.
FAN Green/red 1 For the status of fan shelf and the six fans
The fan shelf is in position, but any of the six fans is faulty.
The fan shelf is in position, and all fans are working normally.
The fan shelf is not in position.
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EPII /SEPU FunctionsEPII /SEPU Functions
As the E1 interface board of the SG7000, the EPII provides the 8-por
t E1 interface functions between the SBPU boards in service proces
sing shelf and external system. It also supports the TDM exchange b
etween all the timeslots in the shelf and any timeslot of the eight 2M
HWs on this board.
New version board is SEPU board ,provides 16-port E1/T1 interface.
EPII must have the same slot number with SBPU, but SEPU support
cross connection feature.
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EPII InterfacesEPII Interfaces
Interface table
Type Parameter Index Remarks
E1 interface 8For connecting narrowband signaling network
2M clock output interface 2 Providing CKII with the clock abstracted in the lineInterface
8K active/standby CKII synchronous clock input interface
2 For connecting CKII board
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EPII IndicatorsEPII Indicators
Indicators
Location Color Note Meaning Normal status
RUN Green1
For board working status
It is flashing (1 s on and 1 s off) when the board is working normally, and is off when the board is abnormal.
ALM Yellow 1
For board faulty status
It is flashing (1 s on and 1 s off)
when the board is abnormal, and is
off when the board is normal
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EPII JumpersEPII Jumpers
S1: Trunk cables selection switch For 75 Ohm coaxial trunk cable, all the eight-bit switches of S1 are “ON”.
For 120 Ohm twisted pair trunk cable, all the eight-bit switches of S1 are “OFF”.
S2 (receiving) and S3 (transmitting): Connecting mode selection switches For 75 Ohm coaxial trunk cable, the unbalanced connection mode with
“transmitting end grounded” and “receiving end not grounded” is recommended, and
all the eight-bit switches of S2 and S3 are “ON”.
For 120 Ohm coaxial trunk cable, the balanced connection mode with “transmitting
end not grounded” and “receiving end grounded” is recommended, and all the eight-
bit switches of S2 and S3 are “OFF”.
S4: Hard reset switch of the board
S5: For debugging purpose
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HBIU Functions HBIU Functions
The HBIU is the Back Interface Board of the system board HSYS.
It performs the RS485 level conversion for the asynchronous serial
port signal of the system board, and implements two physical
interfaces for this asynchronous serial port.
It identifies the service shelf numbers by means of S3 DIP switches.
It provides the physical interface for the back board out-leading
Ethernet interface of the system board.
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HBIU InterfacesHBIU Interfaces
Interfaces
Type Parameter Index Remarks
10/100 BT1 (Ethernet interface for back out-leading of system board) 1 For the loading of system
programs and data
COM3+ and COM3 (RS485 serial interface)
1 each For the power monitoring of power distributor box
Interface
10/100 BT2 1 Not used
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HBIU IndicatorsHBIU Indicators
Indicators
Indicator Color Note Meaning Normal status
HD Green 1 For hard disk running Not used temporarily
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HBIU Switches and JumpersHBIU Switches and Jumpers
S3 switches and jumpers, ON is “0” and OFF is “1”.
Switch bit
Shelf No1 2 3 4 5 6 7 8
0 ON ON ON ON ON ON ON ON
1 OFF ON ON ON ON ON ON ON
2 ON OFF ON ON ON ON ON ON
3 OFF OFF ON ON ON ON ON ON
4 ON ON OFF ON ON ON ON ON
5 OFF ON OFF ON ON ON ON ON
6 ON OFF OFF ON ON ON ON ON
7 OFF OFF OFF ON ON ON ON ON
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SCBU FunctionsSCBU Functions
The SCBU is the back board of HCOM. It works with the HCOM
to cascade the service processing shelves of the SG7000.
It provides two external bi-directional 100 Mbps Ethernet paths to
connect two core LAN Switches in the SG7000 system. It assists
the data switching between shelves, and sends the link data on
the high-speed bus to be forwarded to other shelves to the LAN
switches through network interfaces, which are then sent to the
other service processing shelves to implement the mutual
communication between shelves. It provides one external E1 channel and provides one data channel for the
system test.
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SCBU IndicatorsSCBU Indicators
Indicators
Type Parameter Index Remarks
Interface
Ethernet interface 2For inter-shelf connection and
communication
4Mbps HW
interface8 TDM interconnection between shelves
E1 interface 1 For test
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SCBU IndicatorsSCBU Indicators
Indicators
Location Color Note Meaning Normal status
RUNGreen 1
For board working status
It is flashing (1 s on and 1 s off) when
the board is normal, and is off when the
board is abnormal
ALMYellow
1
For board faulty status
It is flashing (1 s on and 1 s off) when
the board is abnormal, and is off when
the board is normal.
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SCBU Jumpers and SwitchesSCBU Jumpers and Switches
One debugging serial interface J8, one debugging network interface J9 and
one board hard reset button S1
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VIEB Functions VIEB Functions
As the back board of SBPI, the VIEB provides the back out-leading Ethernet
interface for the SBPI.
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VIEB Interfaces VIEB Interfaces
Interfaces
Type Parameter Index Remarks
Interface100M base-T
interface1
It is the back out-leading interface for broadband interface board.
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Chapter 1 SG7000 Hardware StructureChapter 1 SG7000 Hardware Structure
Section 1 Service Shelf Configuration
Section 2 Board Introduction
Section 3 Hardware Working Principle
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Hardware Communication (1)Hardware Communication (1)
Communication between the front boards of service shelves Communication through high-speed bus
Inter-board bus bandwidth 2Gbps X 2 for high-speed and low-delay exchange of
information frames
Dual-backups and load-sharing inter-board buses to guarantee the system reliability
High-speed bus
SBPU
SBPU
SBPI
HCOM
HSYS
HSYS
HCOM
SBPI
SBPU
SBPU
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Hardware Communication (2)Hardware Communication (2)
Communication between serial interface boards The boards that have CPU and are not attached to the high-speed bus in the service
shelves are controlled uniformly by the master/slave serial interface bus, including
clock board CKII, E1/T1 interface board EPII and monitoring board ALUI.
Serial interface bus
EPII
H S Y S
H S Y S
EPII
EPII
EPII
A L U I
C K I I
C K I I
EPII
S C B U
S C B U
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Hardware Communication (3)Hardware Communication (3)
Clock access
Slave clock shelf (7)
...
Active clock distribution line between shelves
Internal Differential 8KHz
Primary Secondary
Standby clock distribution line between shelvesDifferential 8KHz
Slave clock shelf (1)
Master clock shelfCLKA, CLKB
2048kbit/s2048KHz E1 line
BITS
CKII
Active
CKIIStandby
E
P
I
I
E
P
I
I
E
P
I
I
E
P
I
I
E
P
I
I
E
P
I
I
Primary Secondary
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Hardware Communication (4)Hardware Communication (4)
The CKII board has three clock sources: BITS clock, E1 clock and CKII board loca
l crystal oscillator.
In the master clock shelf, the TDM switching bus abstracts two groups of clocks C
TA and CTB from the active and standby CKIIs.
In the master clock shelf, the EPIIs (PM and SM) abstracts clocks from CKII.
The TDM switching bus of every shelf abstracts two groups of clocks CTA and CT
B from the PM and SM.
All EPIIs in the clock shelves abstract clocks from the TDM switching bus in the lo
cal shelf. The CTA has a higher priority and the CTB has a lower one.
The CKII board local crystal oscillator can provide 2-level clocks, so that the SG cl
ock can be locked externally.
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N7LNK Timeslot ConnectionN7LNK Timeslot Connection
15...0
3210
15...0
7654
SLPU(Lower)
SLPU (Upper)
SBPU EPII
0 Slot 0 Slot
E1 Prot numberLink Prot number
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Networking-Maintaining and Loading pathNetworking-Maintaining and Loading path
LanSwitch1
HSYS HSYS
LanSwitch
SG Frame-0SG Frame-0
BAM
VLAN IP:190.1.1.5
IP:190.1.1.70 (for example)
LanSwitch2
IP:172.8.0.8IP:172.6.0.6
IP:172.6.1.6 IP:172.8.1.8HSYS HSYS
SG Frame-1SG Frame-1
IP:172.6.2.6 IP:172.8.2.8
WS1 WS2 WS17……
Internal network
External network
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Lesson ContentsLesson Contents
Chapter 1 SG7000 Hardware Structure
Chapter 2 SG7000 Logical Structure
Chapter 3 SG7000 Message Flow
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Chapter 2 SG7000 Logical StructureChapter 2 SG7000 Logical Structure
Service processing subsystem
Environment monitoring subsystem
Background management and maintenance subsystem
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Service Processing SubsystemService Processing Subsystem
HW
IP interface(FE)
High-speed bus
IP interface unit
(VIEB)
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Local high-speed bus
E1/T1 interface
Equipment management unit
(HSYS)
Signaling interface module
Signaling bottom processing module
Service processing modulePSTN,PLMNNo.7 signaling network
Narrowband signaling processing unit
(SLPU)
Narrowband E1/T1 interface unit
EPII
System support module
Clock unit
(CKII)
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Broadband signaling processing unit
(SBPU)
External clock source
TDM switching bus
LAN drive and IP distribution unit
(SBPI)Soft switch equipmentFE
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Environment Monitoring SubsystemEnvironment Monitoring Subsystem
The subsystem is composed of ALUI and power monitoring board. The ALUI monitors the working statuses of the unit shelf, including the inner-
shelf ambient temperature, power status, and the working status of the back
boards from HSYS receiving I/O boards (such as SBPU and HCOM). And it
displays the statuses on the front indicators.
The power monitoring board of the power distributor box monitors the workin
g status of the power distributor box. It is connected with the HBIU of the HS
YS’s back board through serial interface, collecting the working statuses of t
he power distributor box and reporting to the HSYS.
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Background Management and Maintenance SubsystemBackground Management and Maintenance Subsystem
It is composed of background administration module (BAM), charging server
(BAU), management and maintenance workstation and remote management
and maintenance interface equipment.
System loading The HSYS implements loading from BAM in the FTP mode through network card
1 and network card 2. The SBPU/SBPI implements loading through the HSYS of
local shelf. The SLPU programs and data are loaded through the SBPU.
Equipment management During the initialization, it implements the active/standby arbitration for SBPU,
HSYS, HSCU and CKII and the active/standby switchover function.
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Lesson ContentsLesson Contents
Chapter 1 SG7000 Hardware Structure
Chapter 2 SG7000 Logical Structure
Chapter 3 SG7000 Message Flow
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Chapter 3 SG7000 Message FlowChapter 3 SG7000 Message Flow
Hardware structure
Signaling processing
unit
Inter-shelf connection equipment
Equipment management unit
LAN drive and IP distribution unit
Narrowband E1/T1 interface
unit
Monitoring unit Clock unit
Other service shelves
External clock source
E1/T1 interface
PSTN, PLMN etc. No.7 signaling network
10M/100M interface IP interface unitIP network
System high-speed bus
TDM switching bus
Serial interface bus
Terminal maintenance module
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Message FlowMessage Flow
Message flow direction
PSTN/PLMN signaling message -> SG7000 narrowband E1/T1 interface unit -> TDM s
witching bus and inter-shelf connection -> Implementing intra-shelf or inter-shelf semip
ermanent connection -> Signaling processing unit determines to forward the signaling
message to PSTN/PLM or broadband IP network according to the destination signaling
point information in the message. If the message will be forwarded to PSTN/PLMN, the narrowband E1/T1 interface unit implements the f
orwarding function, which is like the function of narrowband STP (signaling transition point).
If the message will be forwarded to broadband IP network, the signaling processing unit packets/unpac
kets the messages. After the IP distribution by the LAN drive and IP distributor unit, the messages arriv
e at the IP network through the IP interface unit.
The flow is the converse case for the signaling processing from IP network to traditional narrowb
and network.
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