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User Guide
100Mbps MM-to-SM “twister” 7000 Modules:
LH7420C-SCSC-R2
FX multimode SC to FX singlemode SC __ 2km/15km
LH7420C-SCST-R2
FX multimode SC to FX singlemode ST __ 2km/15km
LH7421C-STSC-R2
FX multimode ST to FX singlemode SC __ 2km/15km
LH7421C-STST-R2
FX multimode ST to FX singlemode ST __ 2km/15km
These modules provide seamless integration between higher bandwidth
singlemode and multimode fiber optic segments.
LED Operation:
• PWR: normal operation
• LK: satisfactory receive link status on respective port
• AT: receiving data
Jumper Settings:
Refer to the diagram below for the location of the Link Loss Carry Forward
(LLCF) jumper.
• Set the jumper to enable LLCF by connecting pins 1&2
• Set the jumper to disable LLCF by connecting pins 2&3 (default)
F/O SC (ST)
F/O SC (ST)
F/O SC (ST)
F/O ST (SC)
LLCF
3
2
1
LLCF
3
2
1
100 BASE
LK
AT
LK
AT
PWR
R
X
T
X
R
X
M
M
S
M
T
X
100 BASE
LK
AT
LK
AT
PWR
R
X
S
M
T
X
R
X
T
X
M
M
100 BASE
LK
AT
LK
AT
PWR
R
X
S
M
T
X
R
X
M
M
T
X
100 BASE
LK
AT
LK
AT
PWR
R
X
T
X
M
M
R
X
T
X
S
M
Содержание twister 7000
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