3Com 3C63311 - SuperStack II PathBuilder S310 Bridge/router, Справочное руководство, Страница: 245 / 262

CBR Module 233
Structured DS1 Implement the structured service if you require DS0 midspan drop-and-insert. (See
Figure 170.)
Figure 170 CBR Structured DS1 - Drop and Insert
Midspan drop and insert allows services such as public switched telephone service
to be inserted into the ATM link. Combining this service with Ethernet bridge
service will provide you with a complete integrated communications access
solution, as shown in Figure 171.
Figure 171 Integrated PathBuilder S330/S310 Application
DS0 = 5 DS0 = 5 VP0/VC35
Structured CBR traffic
DS0 DS1
Channel
Bank
ATM Network
DS0 = 5
Public Switched
Telephone
Network
PathBuilder S330/S310
A B C
A
B
C
Channel bank converts analog to T1; putting channel on DS0 5.
ATM network continues to carry CBR traffic on to another ATM network or drops the traffic (on DS0 5) to a
public switched telephone network.
PathBuilder S330/S310 puts DS0 5 on virtual circuit (VP0/VC35) and passes structured CBR traffic through
to the ATM network.
ATM Network
Voice
DS0 = 1-6
LAN
Data
Ethernet
LAN
Ethernet
LAN
Drop
DS0 = 6
PBX or Key
System
PBX or Key
System
Public Switched
Telephone
Network