363-206-285
Shelf Descriptions and Configurations
3-20 Issue 3 June 2001
OC-3 FiberReach Host Shelf - Enhanced Routing 3
When hosting FiberReach Enhanced Routing Topologies (OC-1 Ring Pass-
Through, OC-1 Ring Hairpin Single-Homed and Dual-Homed, and OC-1 Ring
Hairpin Local Drop), an OC-3 shelf changes in only two ways. First, 27G2-U
OLIUs must be used instead of 27G-U OLIUs. Second, when using Group 1 or
Group 3 shelves, two BBF5 jumper circuit packs must be installed in the low-
speed group associated with the Function Unit equipped with the 27G2-U OLIUs,
one in slot 4 and one in slot 8. As an example, Figure 3-11 shows a host shelf that
is equipped for the OC-1 Ring Hairpin Local Drop application.
Equipping the main slots with 24-type OLIUs allows the shelf to provide an OC-12
ring interface.
Figure 3-11. OC-3 DDM-2000 FiberReach Host Shelf - Enhanced Routing Topologies
1
T
G
2
T
G
1
111
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)
O
H
C
T
L
Timing Main
Group A Group B Group C
Low Speed
S
Y
S
C
T
L
u
s
e
r
p
a
n
e
l
Main
Low Speed
D
S
1
(P)
D
S
1
D
S
1
(P)
D
S
1
D
S
1
(P)
D
S
1
Function
Units
D
S
1
(P)
D
S
1
A B C D
Group
O
L
I
U
O
L
I
U
C
A
B
Function Units
OC-1OC-1
DDM-2000
OC-3 Shelf
O
L
I
U
O
L
I
U
UU
2
2
O
L
I
U
2
2
O
L
I
U
DDM-2000
FiberReach
Shelf
2
7
G
2
-
2
7
G
2
-
M
X
R
V
O
M
X
R
V
O
D
S
1
P
M
D
S
1
P
M
D
S
1
P
M
D
S
1
P
M
B
B
F
5
D
S
1
P
M
D
S
1
P
M
D
S
1
P
M
D
S
1
P
M
B
B
F
5
2
6
G
-
U
2
6
G
-
U
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