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Fiber Optic Requirements
The COFOT supports 50/125, 62.5/125, and 100/140
m fiber optic cable. Link length depends on cable
type and system fiber optic budget. (The COFOT can
support a maximum link to link length of 1km.)
Fiber Optic Cable Link Attenuation
At an 850 nm wave length, link segment attenuation
can be no more than:
• 13.0 db for 50/125 m cable
• 16.0 db for 62.5/125 m cable
• 19.0 db for 100/145 m cable
OPERATING SPECIFICATIONS
Cabletron Systems reserves the right to change these
specifications any time without notice.
Fiber Optic Interface
Receive Sensitivity:
-29.5 dBm
Peak Input Power:
-8.2 dBm
Bit Error Rate:
Better than 10
Transmitter Peak
Wavelength:
820 nm typical; 790 nm min;
860 nm max
Spectral Width:
75 nm max
Rise Time:
10 nsec max
Fall Time:
10 nsec max
Fiber Optic Transmitter Power
50/125 m:
-13.0 dBm
16.5 dBm worst case budget
62.5/125 m
-10.0 dBm
19.5 dBm worst case budget
100/140 m:
-7.0 dBm
22.5 dBm worst case budget
Note : The transmitter power and receive sensitivity
levels are peak power levels. To convert to average
power levels, subtract 3 dBm.
BNC Interface
Termination:
Can be connected to internal
50 terminator
Grounding:
Connector is NOT grounded
System Characteristics
COFOT operational limits are determined by individual
system jitter. Because some Ethernet products built
before 1987 cannot operate when the jitter level
exceeds 14 ns, the COFOT may not give error free
operation in all Ethernet environments.
Power Supply
Input Power USA:
Input Power UK:
Input Power Europe: 180 - 240 Vac, 50 Hz
Output Power:
Note: The power source for the COFOT is to be cer-
tified for use in the country of installation with a SELV
output of 12 Vdc, and capable of providing a minimum
output of 800 mA. the output connector is to be com-
patible with TOTAL POWER or MORFUR RJ-01-E
connectors.
Operating Environment
Operating Range:
Heat Output:
-9
Storage Range:
error rate
Humidity Range:
Safety
Designed in accordance with UL1950 with D3 dev-
iations, NEC 725-2(b), CSA 22.2 No. 220, and EN
60950/DIN VDE 0805.
Emissions
Designed in accordance with EN 55022 Class A and
FCC Part 15 Class A emmission limits.
Note: It is the responsibility of the person who sells
the system to which the COFOT will be a part to
ensure that the total system meets allowed limits of
conducted and radiated emissions.
INSTALLING THE COFOT
When you unpack the COFOT, verify that you receive
the following:
• One wall mount transformer with power cord
• One 1.5 inch x 3 inch Velcro® strip
• Three 6 inch tie wraps
• Three cable mounts
Mounting the COFOT
Remove the tape from the adhesive backed Velcro
strips. Place one Velcro half on the COFOT and the
other half on the mounting surface. Press on each
Velcro strip, then press the COFOT to the mounting
surface.
90 - 135 Vac, 50-60 Hz
216 - 264 Vac, 50 Hz
0.8 amp at 12 Vdc
˚
˚
˚
˚
+5
to +40
C (41
to 104
F)
32.8 Btu/hr
˚
˚
˚
˚
-30
to +80
C (22
to 160
F)
5 to 95% (non-condensing)
Connecting and Applying Power
The COFOT power cord has an AC to DC converter.
To connect the COFOT to a power source, plug the
converter into a standard wall outlet and the other end
of the power cord into the COFOT's Power Input
connector. Once connected, the COFOT's PWR
indicator should be illuminated, indicating that the
COFOT is receiving power and is ready for operation.
Caution: Do not use a power cord/converter other
than the one that you received with the COFOT. Not all
converters supply the same voltage and current. Using
the wrong converter can damage the COFOT.
Attaching Fiber Optic Cables
Connect a fiber cable from the COFOT TX port to the
Ethernet device RX port, and from the COFOT RX
port to the Ethernet device TX port.
Caution: If you are using SMA 906 connectors, use
half-alignment sleeves, not full alignment sleeves, on
the ends of the connectors. Full-alignment sleeves will
damage the COFOT's SMA ports.
Attaching a Coax Cable
The COFOT has a selectable internal 50
which eliminates the need for a tee connector and
external terminator. To activate the COFOT's internal
terminator, move the COFOT's TERM switch to the ON
( ) position. If you use an external 50
make sure that the internal terminator is turned off
( ).
Warning: When you set the TERM switch, use a non-
conductive probe or disconnect the power cord.
Warning: The COFOT's BNC port is not grounded.
Coax cable segments should be grounded at a single
point. For safety, only one end of any coax cable
segment should be connected to earth ground.
Cable Strain Relief
Anchor the data cables and the power cord to reduce
the possibility of network interruption. The COFOT
comes with adhesive backed mounting brackets and
tie wraps that you can use to anchor the COFOT's
cables.
POWER
INPUT
COFOT
P
X
92 SERIES
W
M
10BASE-2
10BASE-FL/FOIRL
R
T
TO
MEDIA ADAPTER
LANVIEW
®
WITH
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:
(1) THIS DEVICE MAY NOT CAUSE INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.
POWER REQUIRED: 10-15V - - - , 800mA MAX
DATA CAPABILITY: 10Mb/s
LISTED
TERM
SN
UL
®
TUV Rheinland
®
16EO
LR65407
The Complete Networking Solution
ITE REPEATER UNIT
Cable Mounts and Tie Wraps
terminator
termi-nator,
R
C
L
C
L
N
V
N
K
TX
RX
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