Ds0 Signaling And Dynamic Bandwidth Allocation - 3Com SuperStack II PathBuilder S330 Reference Manual

260 A B: P B
PPENDIX ATH UILDER
S330/S310 M A
ODULE AND PPLICATION
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 188.
Figure 188 Structured DS0 Combining
DS1
DS1
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 189.) 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 189 Channel Associated Signaling
Channel
Bank
These frames are then followed by the ABCD bits of each active DS0. Two DS0's
ABCD bits are provided in each byte after the last DS0 group. Figure 190 shows an
example of three DS0s and their ABCD bits sent in a structured encapsulation.
O
VERVIEW
10 DS0
10 DS0
Up to 24 Timeslots
DS0
ABCD Bits
Channel Associated
Signaling (CAS)
Structured DS0
Grooming
ATM Network