363-206-305
Transmission and Synchronization
Issue 3 June 2000
5-5
For the PSU, the DSXBIU has an additional microwire interface operating at RS-
422 levels.
The backplane for the narrowband shelf can be configured in either quad or octet
modes. In the quad mode, the 6 channel units in the upper subshelf and the 6
channel units in the lower subshelf provide up to 24 DS0s of service each on a 1-
DS1 capacity per subshelf (2 DS1s total). Four DS0 time slots are provided to
each physical channel unit slot. In the octet mode, two DS1 links are provided to
the 6 channel unit slots in the upper subshelf and two DS1 links are provided to
the 6 channel unit slots in the lower subshelf for a total capacity of 96 DS0 or 4
DS1 lines. Eight DS0 time slots are provided to each physical channel unit slot.
One DS1 link is provided for each group of three channel unit slots.
Narrowband shelf services are supported by
SLC-2000
Releases 4.3 and 4.4, or
later. For Release 4.4, the
SLC-
2000 host must be equipped with the SPQ810 DT
server to support both quad and octet mode services. See LTP 363-208-000,
SLC-2000
Access System Application, Planning, and Ordering Guide
for
additional information.
Figure 5-2. DDM-2000 FiberReach Multiplexer Narrowband Architecture (Octet Mode
Shown)
DSXBIU
CU1
CU2
CU3
CU4
CU5
CU6
4 Tip/Ring
Pairs/CU
BCL for
all
CUs and CDTU
Clock
Generation
to all CUs
PQ Generation
for Lower CUs
Microwire Link to
CDTU, RGU, and PCU
4 Tip/Ring
Pairs/CU
CU7
CU8
CU9
CU10
CU11
CU12
4 Tip/Ring
Pairs/CU
4 Tip/Ring
Pairs/CU
DS1
A
DS1
B
DS1
C
DS1
D
CDTU
CU and
Drop
Access
PCU
-25.5v
-48v
-5v
+5s
+5r
RGU
Ringing
Signal to
all CU slots
-48v
RS-422 Level
Microwire
Link to PSU
Power
From
PSU
PQ Generation
for Upper CUs
BOLD denotes signal internal to the NBS
A line that is crossed denotes more than one signal
RPCM (A)
TPCM (A)
RPCM (C)
TPCM (C)
RPCM (B)
TPCM (B)
RPCM (D)
TPCM (D)
tpa 850267/01
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