363-206-305
Shelf Descriptions and Configurations
Issue 3 June 2000
3-19
Figure 3-18. DDM-2000 FiberReach Unprotected DS1 Services Only
T1 Extensions Only
3
Figure 3-19, Figure 3-20, and Figure 3-21 show examples of the DDM-2000
FiberReach in a T1 extension configuration. The wideband shelf is a complete
DS1 to OC-1 solution; therefore, the narrowband shelf is not used for this
application. The wideband shelf uses the two main OLIU slots to interface an
OC-1 or OC-3 or OC-12 line to the low-speed group(s). The OLIU circuit packs are
equipped in pairs, one service and one protection [denoted (P)]. Low-speed
interface growth proceeds in two DS1 increments by equipping the low-speed
slots with dual T1 extension circuit packs. The SYSCTL is always required for
these applications. Primary lightning protection (Lucent Technologies' protector
unit 4B3EW or equivalent) and the secondary lightning and surge protection
assembly (mounted externally to the DDM-2000 FiberReach shelf) are required
for outside plant applications.
Figure 3-19 shows a 1x1 low-speed protection configuration with four low-speed
groups (A, B, C, D) for a maximum of four service and four protection units per
multiplexer. Primary (Lucent's protector unit 4B3EW or equivalent) and secondary
lightning protection assemblies are required for each tip/ring pair of a T1
extension.
S
Y
S
C
T
L
U
S
E
R
P
A
N
E
L
D
S
1
D
S
1
Function
Units
2
6
O
L
I
U
2
6
O
L
I
A B C D
D
S
1
D
S
1
D
S
1
D
S
1
D
S
1
U
(P)
Low Speed
Groups
tpa 843667/01
G2
-U
G2
-U
* 28G-U for OC-3
29G-U for OC-12
Main*
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