363-206-285
Shelf Descriptions and Configurations
Issue 3 June 2001
3-17
OC-3 Dual Homing Shelf 3
Figure 3-9 shows a DDM-2000 OC-3 shelf equipped for a dual homing
configuration, allowing two hosts to be active on the same OC-3 ring. This allows
a 0x1 application where traffic is routed to both hosts to provide host protection.
Each host node is connected to the low-speed ring through OLIUs in the Function
Unit. In this application, two DDM-2000 OC-3 shelves are hosting one or two
DDM-2000 FiberReach OC-1 rings.
Equipping the main slots with 24-type OLIUs allows the shelf to provide an OC-12
ring interface.
Figure 3-9. DDM-2000 OC-3 Dual Homing Shelf
D
S
1
D
S
1
D
S
1
67
D
S
1
D
S
1
D
S
1
234
1
D
S
1
5
D
S
1
1
C
T
G
2
T
G
1
O
L
I
U
O
L
I
U
M
X
R
V
O
M
X
R
V
O
111
A
B
S
Y
S
C
T
L
U
S
E
R
A
N
E
L
P
AUXCTL
SYSCTL
2(P) 2(P) 2(P) 2(P)
8(P)
O
H
C
T
L
Timing Main
Group A Group B Group C
Function Units
Low Speed
O
L
I
U
2
2
2
2
2
7
G
-
U
To
Low-Speed
Ring
To
High-Speed
Ring
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