SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
79 Revision: 2002-09-10
8 Point-to-Multipoint Operation
This chapter describes the point to multipoint operation.
8.1 Features
• In point-to-multipoint operation the time slots of the E1 frame may be sent to different NTUs.
In the Watson 5 point-to-multipoint implementation the time slots of the two E1 interfaces
may be assigned to four DSL loops.
• It is configurable which time slots on the DSL loops are used to carry the data from the E1
interface.
• To distribute the time slots from one E1 interface to more than four DSL loops, multipoint
LTUs can be cascaded.
Figure 8-1 shows some examples of multipoint configurations, which are obtained by
configuring explicitly point-to-point links. (Switching-off multipoint mode yields configuration a)
= pure dual LTU operation.) In addition, LTUs can be cascaded e) to increase the number of
links.
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
b)
c) d)
e)
D
A
B
C
E1
1
E1
2
a)
Figure 8-1: Examples of Multipoint Configuration
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