Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 341 / 2536

363-206-285
Circuit Pack Descriptions
Issue 3 June 2001 7-63
Figure 7-24. BBG2 MXRVO Circuit Pack Block Diagram
Timing Circuitry 7
The MXRVO receives STS-1 timing signals which are traceable to the STS-1
clocks generated by the TG circuit packs.
The MXRVO can select between the supplied timing signals as requested by the
SYSCTL via the intra-shelf control bus. The selected timing signals are used to
time both the receive and transmit directions of the MXRVO.
Protection Circuitry 7
The MXRVO protection switch points reside on the OLIU and on each low-speed
circuit pack for the STS-1 and VT-G signals, respectively. Optional 1x1
nonrevertive MRXVO circuit pack protection is provided and is independent of the
OLIU and low-speed DS1 circuit packs.
7 OF 8
VT-G
#1
VT-G
VT-G
VT-G
VT-G
VT-G
VT-G
VT-G
#2
#3
#4
#5
#6
#7
#8 (P)
VT-G
VT-G
VT-G
VT-G
VT-G
VT-G
VT-G
+5V PWR
DS1 CPs
VT-G to STS-1
Multiplexer
STS-1 to VT-G
Demultiplexer
To/From
To DS1
Circuit
Packs
Timing
Protection
Switch
Selector
OLIU C.P.s
SONET
OH
Adds STS-1
Removes STS-1
Path Overhead
Path Overhead
SYSCTL
SYSCTL
TGS CPs
48V A
48V B
To/From
(Service
And
Timing
Intrashelf
Control
To/From
From Shelf
48V Fuses
To/From
From
(Service And
Protection)
Protection)
STS-1