Structured Versus Unstructured Summary; Ethernet And Voice Application - 3Com 3C63400-3AC-C - PathBuilder S700 Switch Reference Manual

Ethernet and Voice
Application

Structured versus Unstructured Summary

Use Table 30 to select whether to use structured or unstructured DS1 CBR.
Table 30 Selecting Structured Mode Versus Unstructured Mode
DSO midspan drop and insert
DSO access grooming
DS1 network management end to end
DS1 end to end
(no DSO access)
DS1 CBR 1.536 Mbps of bandwidth
DS1 CBR 1.544 Mbps of bandwidth
Dynamic Bandwidth Allocation (DBA)
Figure 59 depicts the effects of structured versus unstructured service on the
DS1/E1 framing.
Figure 59 Structured Versus Unstructured Effects on Transit DS1
PathBuilder S700
DS1
AAL 1
ESF
FDL
Bit
Bucket
DS1 = 1,544 Mbps
DS0 = 64 Kbps
DS - Digital Signal
ESF - Extended Superframe
A typical configuration involves multiple PathBuilder S700s connected through an
ATM network that could consist an ATM switch or an ATM network consisting of
multiple switches. This configuration is shown in Figure 60.
Structured
X
X
X
X
X
Interface
DS0 DS0 DS0
DS1 Structured N x 64 Kbps
PathBuilder S700
DS1
AAL 1
ESF
FDL
DTE
Timing
Supported Applications
Unstructured
X
X
X
X
DS0 ABCD
Interface
DS1
DS1 Unstructured
95