363-206-285
Shelf Descriptions and Configurations
Issue 3 June 2001
3-15
OC-3 VT/STS Hairpin Shelf 3
An example of an OC-3 shelf equipped to allow both VT and STS hairpin cross-
connects is shown in Figure 3-7. The VT/STS hairpin feature allows cross-
connections from Function Units C to A, or C to B. In this example, the VT hairpin
feature allows cross-connections between Function Units A and C when those
Function Units are equipped with 22-type OLIUs, STS1E, or MXRVO circuit packs
(MXRVO-to-MXRVO cross-connections are not allowed); the STS hairpin feature
allows cross-connections between Function Units B and C when equipped with
22-type OLIUs, STS1E, or DS3 circuit packs.
The hairpin feature keeps local VT/STS traffic from being placed on the OC-3 ring.
This increases the usable bandwidth on the OC-3 ring and may remove the need
to add additional OC-3 shelves.
Equipping the main slots with 24-type OLIUs allows the shelf to provide an OC-12
ring interface.
Figure 3-7. DDM-2000 OC-3 VT/STS Hairpin 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
2
2
2
2
O
L
I
U
O
L
I
U
2
2
2
2
D
S
3
D
S
3
tpa 844765-01
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