LBVM920 Series 1.2 GHz Indoor High Output Optical Node
Installation & Operation Manual
Page 2 of 4
OPTICAL, RF & POWER CONNECTIONS
1.
The powering port and all RF ports are standard F-type coaxial connectors. The optical connector(s) are a SC/APC female-type.
2.
The LBVM920 can be powered by applying 12-30 VDC via F connector labeled "PWR IN". 100-240 VAC to 29 VDC switching power pack is supplied in the box.
3.
Connect a coaxial cable from the output of the power pack to the PWR IN port on the LBVM920.
4.
The LBVM920 can also be powered from the RF OUT/PWR IN port by combining RF and power via a power inserter.
5.
After connecting the coaxial cable between the power pack output and the LBVM920, plug the power pack into the wall receptacle.
6.
The LBVM920 adjustment plug-ins, status indicator LEDs and DC test points (TPs) are located under the lid of the ONU. The lid can be opened using a size #5
Allen key.
7.
When the LBVM920 powers up, the DC POWER ON LED will illuminate. As the LBVM920 is an HFC node with upstream transmitter always ON, the LASER ON
LED will also illuminate as soon as the LBVM920 powers up.
8.
Connect the LBVM920 chassis to physical earth (ground) by using the grounding screw on the LBVM920.
9.
The LBVM920 receiver is a wide range receiver that accepts all downstream wavelengths from 1200-1600 nm. However, if the LBVM920 is a single fiber (WDM)
unit then the receiver range is limited to 1550 ± 10 nm. Please note that a single fiber WDM LBVM920 cannot have the same receiver and transmitter wavelength,
while a dual fiber LBVM920 could operate on the same receive and transmit wavelength since the transmitter (TX) & receiver (RX) wavelength travel on different
fibers.
10.
The LBVM920 accepts optical input levels from -8 dBm to 0 dBm. Using an optical power meter at appropriate downstream wavelength, make sure the optical level
on the incoming fiber is within range.
11.
Make sure the optical cable is matched for the proper connector (ie. SC/APC to SC/APC). After cleaning all optical connectors, connect the optical fiber(s) to the
OPT IN/OUT port on the ONU.
12.
If the input optical power is within range, the OPT ON LED on the photo diode will illuminate. Once the optical fiber is connected to the ONU, the O.P. TP 1 mW/1
VDC test point (TP) on the photo diode can be used to measure the optical input detected by the forward receiver in the ONU. Use a digital multimeter on DC
voltage setting and measure between the DC TP and the grounding screw. See table below for relation between measured DC voltage on O.P. TP and optical
power on the LBVM920 optical node.
SPECIFICATIONS CONT'D.
Parameter
Specification
Forward Receiver
C/N
(2)
50 dB
CTB
(2)
-64 dB
CSO
(2)
-60 dB
Return Transmitter
Optical Wavelength (CWDM available)
1310, 1550, or 1610 nm
Optical Output Power (DFB laser)
2 or 3 mW
Optical Output Return Loss
45 dB
RF Input Level (Total power)
(3)
15-25 dBmV
RF Input Frequency Range
(1)
5-85 MHz
Flatness of Frequency Response (f = 5-fmax MHz)
± 1 dB
Input Return Loss (f = 5-fmax MHz)
16 dB
Power, Environmental & Physical
Total Power Consumption (30 VDC power pack)
< 14 W
Operating Humidity
5-95%, non-condensing
Operating Temperature
-40°C to +60°C (-40°F to +140°F)
Dimensions (H x W x D)
4.7”H x 8.3”W x 3.1”D (12.0H x 21.0W x 8.0D cm)
Weight
2.2 lb (1.0 kg)
NOTES:
(1)
Other diplex splits available; 45/54 MHz
(2)
-1 dBm optical input; 3.5% OMI/CH; channel loading 102-550 MHz analog channels, & digital compressed or
equivalent broadband noise above 550 MHz to 1218 MHz at levels 6 dB below equivalent video
(3)
NPR @ 38 dB. Measured using a receiver with an equivalent input noise (EIN) of < 2.5 pA/Hz
0.5
with a link budget of 6 dB
(10 km fiber + passive loss)
V (DC) on 1 mW/1V O.P. TP
DC Test Point of ONU
Optical Level (mW)
Optical Level (dBm)
OPT ON LED
Notes
2.00
2.00
3
ON Blinking
Too high input
1.58
1.58
2
ON
No optical AGC
1.26
1.26
1
1.00
1.00
0
Optical AGC
0.79
0.79
-1
0.63
0.63
-2
0.50
0.50
-3
0.40
0.40
-4
0.32
0.32
-5
