3
Switching in public networks
CSPDN: Circuit switched public data
net*
PSPDN: Packet switched public data
net**
DQDB: Distributed queue dual bus
* Used by European Telecom’s that
use X.21 in circuit switched nets
**Used by British Telecom’s
Packet-switched Service (PSS), Data Pac (Canada) ...
Cell switching
- resembles packet switching
- difference: cells (packets) have a fixed size :
offers bounded delay guarantees
(QoS compatible, long packets won’t stuck cells)
- difference: cells (packets) have a fixed size :
offers bounded delay guarantees
(QoS compatible, long packets won’t stuck cells)