3Com S330 manual DS0 Signaling and Dynamic Bandwidth Allocation, Structured DS0 Combining

234APPENDIX B: PATHBUILDER S330/S310 MODULE AND APPLICATION OVERVIEW

Drop-and-Insert DS0 channels can be allowed to transit the entire path, providing DS0 to DS0 connectivity between end locations. Structured DS0s can also be groomed to be combined through an ATM network, thereby allowing end-to-end DS0 switching, as shown in Figure 172.

Figure 172 Structured DS0 Combining

DS1

10 DS0

10 DS0

DS1

Structured DS0

Grooming

ATM Network

Up to 24 Timeslots

PBX - Private Branch Exchange

VCC - Virtual Channel Connection

DS0 Signaling and Dynamic Bandwidth Allocation

Structured voice DS0s allow for channel-associated signaling by providing a path for DS0 ABCD bits. (See Figure 173.) Channel-associated signaling allows telephone supervision to be signaled end-to-end. Note that structured DS1 CBR occupies only the needed bandwidth for the DS0s selected.

Figure 173 Channel Associated Signaling

DS0

ABCD Bits

Channel Associated

Channel

Bank

Signaling (CAS)