Motorola SG 2000 用户手册
5 - 1 2 O p e r a t i o n
SG 20 00 Ins tal la tion and O pera tion M anua l
O p t i c a l i n p u t
l e v e l ( d B m / m W )
l e v e l ( d B m / m W )
T P V o l t s
( 1 m W = 1 V )
O u t p u t ( d B m V )
7 7 c h a n n e l s
O u t p u t ( d B m V )
1 1 0 c h a n n e l s
C o m m e n t s
–2.0/0.6
0.6 21
19
Normal
–2.5/0.6
0.6 20
18
Normal
–3.0/0.5
0.5 19
17
Normal
–3.5/0.5
0.5 18
16
Normal
–4.0/0.4
0.4 17
16
Normal
–5.2/0.3
0.3
15
13
High level alarm
Typical output levels are approximately 2 dB greater than the minimum levels.
Optical modulation index (OMI) for 77 channels (per channel): 0.0403.
OMI for 110 channels (per channel): 0.0337.
Optical transmitter wavelength is 1310 nm.
Bold type indicates default values.
Optical modulation index (OMI) for 77 channels (per channel): 0.0403.
OMI for 110 channels (per channel): 0.0337.
Optical transmitter wavelength is 1310 nm.
Bold type indicates default values.
Figure 5-14 illustrates the relationship between test-point voltage (Vdc) and optical power (dBm):
F i g u r e 5 - 1 4
T e s t - p o i n t v o l t a g e v e r s u s o p t i c a l p o w e r
T e s t - p o i n t v o l t a g e v e r s u s o p t i c a l p o w e r
Opt
ic
a
l power
(dBm)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
3.00
0.25
0.50
0.75
1.00
1.25
1.50
Test point DC Voltage (Vdc)
1 Volt = 1 Mw optical power
10 Log x Voltage (DC) = optical power (dBm)
10
1.75
2.00
2.25
2.50
2.75