363-206-295
Shelf Descriptions and Configurations
Issue 1
December 1997
3-9
OC-12 STS-1 Path Switched Ring Shelf
3
Figure 3-4 shows a DDM-2000 OC-12 Multiplexer shelf equipped for an STS-1
path switched ring application. One pair of OC-12 OLIU circuit packs are located
in the main B slots. The TSI slots must be equipped with TSI FLEX circuit packs.
The function units can be equipped with triple STS1E, triple DS3, or OC-3 circuit
packs. Figure 3-4 shows a configuration that supports up to three STS-1 and
three DS3 interfaces and two OC-3 optical extensions. The optical extension
OLIUs can provide transport for either three independent STS-1s or one STS-3c.
Dual ring interworking (DRI) capabilities are available on STS-1 paths dropped by
the 3STS1E interfaces.
Figure 3-4.
OC-12 STS-1 Path Switched Ring Shelf
T
S
I
T
G
D
S
3
S
Y
S
C
T
L
O
H
C
T
L
U
S
E
R
P
A
O
L
I
U
O
L
I
U
1
1
1
1
T
G
2
T
S
I
D
S
3
O
L
I
U
O
L
I
U
O
L
I
U
O
L
I
U
N
E
L
1
1
1
1
3
3
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
2(P)
D
C
B
A
TS1
B
A
Main
Function units
1
7
7
C
A
P
P
B
L
K
1
7
7
C
A
P
P
B
L
K
3
S
T
S
1
E
3
S
T
S
1
E
Timing
Timing
