Structured Versus Unstructured Summary; Ethernet And Voice Application - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

Ethernet and Voice
Application

Structured versus Unstructured Summary

Use Table 25 to select whether to use structured or unstructured DS1 CBR.
Table 25 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 1.544 Mbps of
bandwidth
Dynamic Bandwidth
Allocation (DBA)
Figure 57 depicts the effects of structured versus unstructured service on the
DS1/E1 framing.
Figure 57 Structured Versus Unstructured Effects on Transit DS1
PathBuilder S600
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 S600s 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 58.
Structured Unstructured
X
X
X X
X X
X X
X
Interface
DS0 DS0 DS0
DS1 Structured N x 64 Kbps
PathBuilder S600
DS1
AAL 1
ESF
FDL
DTE
Timing
Application Overview
DS0 A&B
Interface
DS1
DS1 Unstructured
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