92
C
HAPTER
4: P
ATH
B
UILDER
S700 M
ODULE
AND
A
PPLICATION
O
VERVIEW
DS0 Signaling and Dynamic Bandwidth Allocation
Structured DS0s provide channel associated signaling (CAS) by providing a path
for DS0 ABCD bits. See Figure 55.
Channel associated signalling allows telephone supervision to be signaled end to
end. Note that structured DS1 CBR occupies only the needed bandwidth for the
DS0s selected.
Figure 55
Channel Associated Signaling
These frames are then followed by the ABCD bits of each active DS0. Two DS0s
ABCD bits are provided in each byte after the last DS0 group. Figure 56 illustrates
an example of 3 DS0s and their ABCD bits sent in a structured encapsulation.
Figure 56
Multiframe Structure for 3x64kbit/s DS1 or E1 with CAS
DS0
A&B Bits
Channel Associated
Signaling (CAS)
Channel
Bank
PathBuilder S700
PathBuilder S700
AAL1 Pointer
First Transported Octet of Multiframe
Second Transported Octet of Multiframe
First 125
µ
sec Frame of Multiframe for
DS1
Second 125
µ
sec Frame of Multiframe for
DS1
Last 125
µ
sec Frame of Multiframe for
DS1
Signaling
Substructure
ABCD for Second
Transported Timeslot
ABCD for
Third
Transported
Timeslot
ABCD for
First
Transported
Timeslot
. . .
Summary of Contents for 3C63400-3AC-C - PathBuilder S700 Switch
Page 14: ...xiv CHAPTER SUPPLEMENTARY REGULATORY INFORMATION ...
Page 18: ...4 ABOUT THIS GUIDE ...
Page 28: ...14 CHAPTER 1 SYSTEM DESCRIPTION ...
Page 88: ...74 CHAPTER 3 GETTING STARTED ...
Page 260: ...246 CHAPTER 6 PATHBUILDER S700 DIAGNOSTICS AND PERFORMANCE MONITORING ...
Page 270: ...256 INDEX ...