A Novel Parametric ATM Adaptation Layer 1 Bridging Between PCM and ATM. Speaker : Utku Özcan ASIC Designer, R&D, Netaş, Turkey. Designers: Utku Özcan,ASIC Designer İsmail Hakkı Topçu, Hardware Designer Ömer Aydın, Senior System Engineer {ozcan, topcu, aydin}@netas.com.tr. - PowerPoint PPT Presentation
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Speaker:Utku Özcan
ASIC Designer, R&D, Netaş, Turkey
Designers:Utku Özcan,ASIC Designer
İsmail Hakkı Topçu, Hardware DesignerÖmer Aydın, Senior System Engineer{ozcan, topcu, aydin}@netas.com.tr
A Novel Parametric ATM Adaptation Layer 1Bridging Between PCM and ATM
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
ATM (Asynchronous Transfer Mode):A most recent network technology
- voice, image and data transfer on the same network- support of users with different features- support high transfer rates between end users
ATM network
ATM (Asynchronous Transfer Mode)
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
User information is carried in 53 byte packetscalled ATM cells on an ATM network
- user information acquired in 53 byte packets On the Transmitter - packets reassembled and sent to users On the Receiver
ATM (Asynchronous Transfer Mode)
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
ATM Cell
ATM cell payload (47 bytes) AAL1 Header(1 byte)
ATM Header(5 bytes)
Network element
Network element
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
End users described by QoS (Quality of Service) On ATM
Users tell the network what kind of transfer will existNetwork will be programmed for best performance
according to this set of information
QoS 1
QoS 2
Preparation of ATM to the users
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
ATM Network General Architecture
Physical Layer(PHY)
ATM Layer(ATM)
AAL Layer(AAL)
Physical Layer(PHY)
ATM Layer(ATM)
AAL Layer(AAL)
AAL userAAL user
An ATM network is implemented mostly as hardwareAAL users are implemented mostly as software
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
Basic QoS typesCBR (Constant Bit Rate)VBR (Variable Bit Rate)
Some of QoS data carried in ATM Header
GFC VPI
VPI VCI
VCI
VCI PTI CLP
HEC
AAL1 Header
ATM cell payload byte 1
...
...
ATM cell payload byte 2
ATM cell payload byte 47
0347
QoS List
ATM QoS types
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
AALATM Adaptation Layer
It serves as an interface between the users and the ATM network
5 different types of AAL are defined in ITU-T Standarts
Most common AAL1 typesAAL1: used in CBR type QoS (e.g. POTS)AAL5: used in VBR type QoS (e.g. Internet)
AAL1 AAL5
ATM Adaptation Layer
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
AAL1ATM Adaptation Layer 1
- a connection based layer protocol- support to conventional phone networks
- numerous researches on AAL1
- realtime voice or image transmission- ISDN network on ATM network
ATM Adaptation Layer 1 (AAL1)
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
ISDN facility on ATM
Physical Layer(PHY)
ATM Layer(ATM)
AAL Layer(AAL)
ISDN Terminal
Physical Layer(PHY)
ATM Layer(ATM)
AAL Layer(AAL)
ISDN Terminal
Support of 64 kbps voice traffic: ISDN over ATMResult: ISDN uses ATM advantages
Utku Özcan3/11/1999
ICSPAT’99
A Novel Parametric AAL1 Bridging Between PCM and ATM
ISDN Rate Adaption and AAL1
ISDN supports users with 64 kbps rateToday, most users have a bandwidth of lower than 64 kbps