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GSM SIM ServerGSM SIM Server Low Level Protocol Scheme
AddPac Technology
www.addpac.com
2013, Sales and Marketing
ContentsContents
• General GSM SIM Server Service Diagram• Dynamic IP Address Environment (example)
GSM V IP G H d A hi ( l )• GSM VoIP Gateway Hardware Architecture(example)• GSM SIM Server Hardware Architecture(example)
L l SIM d R t SIM Fl• Local SIM and Remote SIM Flow• Remote SIM Initialize Scheme• AddPac Remote SIM Data Link Protocol• AddPac Remote SIM Data Link Protocol
www.addpac.com 2
General GSM SIM Server Service DiagramGeneral GSM SIM Server Service Diagram
GK
EMS
Media Gateway
Gate Keeper
MGNew York Moskva
MGMGMG
PSTN IP Network(WAN)
BS
Elementary ManagementSystem
Billing Server
PSTNSIP Proxy Server
Billing Server
LAN
LANAP-GSS5000GSM SIM Server
Remote SIM
GSMNetwork
GSMNetwork
AddPac GSM Gateways for SIM Client
www.addpac.com 3
GSM TerminalGSM Terminal
Dynamic IP Address Environment y
Dynamic DNS
DNS Update
DNS Query(gethostbyname)
InternetSIM Client
(Ex : AP-GS916) 3G/WiMaxData Modem(PPP or DHCP)
p
3G/4GData
GSM SIM Server(E AP GSS5000)3G/WiMax Data ModemSIM Client
xDSL Modem(PPP or DHCP)
Data
(Ex : AP-GSS5000)(PPP or DHCP)
DNS Connection
SIM Client(Ex : AP-GS916)
www.addpac.com 4
DNS Connection
SIM Data Connection
GSM VoIP Gateway H/W Architecture
AP-GS916 16-Port GSM VoIP Gateway
(Ex : AP-GS916) AP GS916 16 Port GSM VoIP Gateway
Internal H/W Block Diagram
GSMModuleAntenna DSP
0
UARTAntenna
Antenna
GSMModuleGSM
Module DSP
DSP
MemoryGSM
Network
Call Manager
RISC
AntennaGSM
Module
DSP Memory
InternetRJ45MACAntenna
Antenna
GSMModuleGSM
M d l
DSPLAN
GSM Phones
Antenna
Antenna
Antenna
ModuleGSM
ModuleGSM
M d l
UART
DSP15
www.addpac.com 5IP Phone
IP Phone to GSM Phone
Antenna Module
GSM SIM Server H/W Architecture
GSM SIM Server
(Ex : AP-GSS3000)
64ch x 16 Slot = 1024ch Service Diagram
AP-GSC640
FPGA Memory GSM VoIP Gateway
RISCCPU64ch SIM Card Module
Remote SIM Call Manager
RJ45MACAP-GSC64
Internet
15FPGA
www.addpac.com 6
Local SIM and Remote SIM FlowLocal SIM and Remote SIM Flow
AddPac GSM VoIP Gateway AddPac GSM SIM Server
GSMM d l
Local Remote
AddPac GSM VoIP Gateway (SIM Client)
AddPac GSM SIM Server
Module
DSP
SIM
GSMAP-GSC32
Remote SIMSIM
RemoteSIM
UART
S
M
Module
SIM
GSMFPGA
0
RISC
DSPMemoryModule
SIM
GSM RISC
Memory
SIM Card Module
RJ45MAC
LAN
GSMModule
SIMInternet RJ45
MAC
LAN
www.addpac.com 7
R t SIM I iti li S hRemote SIM Initialize Scheme
www.addpac.com 8
Remote SIM Initialize (example)Remote SIM Initialize (example)
SIM data request
SIM serverSIM client (GSM VoIP Gateway)
SIM init startq
SIM data response Round trip delayAvg. 770 ~ 890 msMax. 1220 ~ 2420 ms
Message count about 446 (370 ~ 425 sec)
SIM data request
SIM data responseSIM init doneSIM init done
SIM data request (status)SIM data response
Status query (20 sec)
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SIM Service Connection
GSM SIM Client GSM SIM Server
Queue
GSMModule
Queue(SIM Data)
Queue(D t Li k)
Queue(D t Li k)
SIM Card
SIM C d
Queue(SIM Data)
Data Link Connection
GSMModule
GSMModule
(Data Link) (Data Link)
FPGA
Card
SIM Card
SIM C d
Modem(PPP or DHCP)
Modem(PPP or DHCP)
Network Connection
Module Card
SIM Card
Wireless(3G, WiMax, etc)
Ph i l C ti
GSMModule
SIM Card
e ess(3G, a , e c)Wired(xDSL)
www.addpac.com 10
Physical Connection
D t Li k S hData Link Scheme
www.addpac.com 11
Technical Issues
• Access Network Environment for SIM Client– 3G Data, WiMAX, etc Wireless Modem– “GSM VoIP Service + SIM Data Exchange” is occurred concurrently – Characteristic : High Delay Frequent Packet LossCharacteristic : High Delay, Frequent Packet Loss,
Frequent Packet Sequence Change, Best Effort QoS, Abrupt IP Address ChangeAbrupt IP Address Change,Unstable Power Supply
– High Performance & Reliable Data Link Protocol must be used
AddP D l d M difi d LAPD P t l i d f• AddPac Developed Modified LAPD Protocol is used for Remote SIM Data Link Protocol
• This Modified LAPD Protocol is very strong in wireless env• This Modified LAPD Protocol is very strong in wireless env. like as 3G network, WiMax.
• LAPD protocol is originally ISDN D-Channel Data Link
www.addpac.com 12Rick Graziani [email protected] 12
p g yProtocol
ISDN LAPD Protocol FrameISDN LAPD Protocol Frame
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ISDN LAPD Protocol Frame
Th LAPD fl d t l fi ld id ti l t th f HDLC
ISDN LAPD Protocol Frame
• The LAPD flag and control fields are identical to those of HDLC. • The LAPD address field is 2 bytes long. • Service access point identifier (SAPI), which identifies the portal at which
LAPD ser ices are pro ided to La er 3LAPD services are provided to Layer 3. • The command/response bit (C/R), indicates whether the frame contains a
command or a response. The second byte contains the terminal endpoint identifier (TEI)• The second byte contains the terminal endpoint identifier (TEI).– Each piece of terminal equipment on the customer premises needs a
unique identifier. The TEI may be statically assigned at installation or the switch may– The TEI may be statically assigned at installation, or the switch may dynamically assign it when the equipment is started up.
– Statically assigned TEIs range from 0 to 63. Dynamically assigned TEIs range from 64 to 126– Dynamically assigned TEIs range from 64 to 126.
– A TEI of 127, or all 1s, indicates a broadcast.
www.addpac.com 14
Thank you!AddPac Technology Co., Ltd.
Sales and MarketingSales and Marketing
Phone +82.2.568.3848 (KOREA)FAX +82.2.568.3847 (KOREA)
E-mail [email protected]
www.addpac.com 15