DEV 7231, User Manual, Page: 15 / 24

User Manual DEV 7xxx Optribution® Modules
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Copyright DEV Systemtechnik GmbH 2012-2017 15
Note:
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NSPoF redundancy configurations provide the optimum safety for optical
transmission chains, since the components of the main channels and of the
backup channels are realized as individual and independent modules.
Only each internal dual channel 1:2 NSPoF splitter module used inside the
DEV 7113 chassis represents a passive component consisting of two locally
separated 1:2 L-Band splitters on one PCB in a single mechanical housing.
Thus, with the NSPoF option the main signal and the backup signal are routed
through the same mechanical housing.
An application scenario that would cause both splitters on this PCB (housing) to
fail at the same time does not appear feasible, since the splitters are purely
passive components; therefore, this is not considered as a critical configuration
for the NSPoF option.
3.2.2 N+1 Redundancy Options
N+1 redundancy options are used to realize a redundant optical link to a number of
main links per n+1 redundancy.
O p tic a l
E le c tric a l
E le c tric a l
O p tic a l
R e d u n d a n c y O p tic a l
T ra n s m itte r M o d u le
O p tic a l
E le c tric a l
E le c tric a l
O p tic a l
O p tic a l
E le c tric a l
E le c tric a l
O p tic a l
O p tic a l
E le c tric a l
E le c tric a l
O p tic a l
O p tic a l
E le c tric a l
E le c tric a l
O p tic a l
O p tic a l T ra n s m itte r M o d u le A
O u t A
O u t B
O u t C
O u t D
In A
In B
In C
In D
O p tic a l T ra n s m itte r M o d u le B
O p tic a l T ra n s m itte r M o d u le C
O p tic a l T ra n s m itte r M o d u le D
R e d u n d a n c y O p tic a l
R e c e iv e r M o d u le
O p tic a l R e c e iv e r M o d u le A
O p tic a l R e c e iv e r M o d u le B
O p tic a l R e c e iv e r M o d u le C
O p tic a l R e c e iv e r M o d u le D
4 + 1 R e d u n d a n c y S w itc h M o d u le 4 + 1 R e d u n d a n c y S w itc h M o d u le
4 + 1 R e d u n d a n c y : N o rm a l O p e ra tio n
T ra n s m itte r C h a s s is R e c e iv e r C h a s s is
O p tic a l F ib e r
O p tic a l F ib e r
O p tic a l F ib e r
O p tic a l F ib e r
O p tic a l F ib e r
R F L e v e l
R F L e v e l
R F L e v e l
R F L e v e l
R F L e v e l R F L e v e l
R F L e v e l
R F L e v e l
R F L e v e l
R F L e v e l