Versa Technology VX-CM790 User manual

D3.0 Cable Modem VX-CM790
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D3.0 Cable Modem
VX-CM790
User Manual
Versa Technology, Inc

D3.0 Cable Modem VX-CM790
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To our distinguished customers:
Congratulations on your purchase of the VX-CM790 Cable Modem. The
VX-CM790 is designed keeping in mind a Service Providers need to deploy
cost effective and reliable high speed data services. The VX-CM790 provides
superior RF performance over DOCSIS 3.0 specifications to operate on
challenging RF networks.
This user manual contains all the information you need to install and configure
your new VX-CM790 Cable Modem. Please read it carefully first before using
VX-CM790.

D3.0 Cable Modem VX-CM790
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CONTENT
Key features.......................................................................................................................................1
Safety and Warnings .........................................................................................................................2
Unpacking Package Contents ...........................................................................................................3
Interface Description:...................................................................................................................... ..4
Cable Modem Spec. .........................................................................................................................5
General Spec. ...................................................................................................................................6
Cable Modem Configuration........................................................................................................... ..6
Q & A.................................................................................................................................................8

D3.0 Cable Modem VX-CM790
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Key features
•CableLabs® DOCSIS 1.0/1.1/2.0/3.0 Standard Compliant
•Surge‐resistant power supply
•One standard RJ ‐45 connector for 10/100/1000 Base‐T Ethernet with
Auto‐negotiation and MDIX functions.
•Transparent bridging for IP traffic
•SNMP network management support
•Remote operating firmware downloading
•Support Web pages and private DHCP server for status monitoring
•Plug and Play installation
•Supports Multiple Provisioning Mode
•Dual IPv4/IPv6 capable
Cable modems can provide maximum downstream speeds of 400 Mbps and
upstream speeds of 120 Mbps. However, the actual rate provided by your
specific service provider may vary dramatically from these maximum speeds.
***** Telnet port is 2323 for example: telnet 192.168.100.1 2323

D3.0 Cable Modem VX-CM790
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Safety and Warnings
1 Do not put the VX-CM790 on unstable desktop.
2 Keep the device in a dry and clean place.
3 Keep the device away from liquid, dust, magnetic and excessive heat.
4 Keep the device work under the specified voltage supply.
5 Do not put any stuff and liquid into the holes on device.
6 Do not put heavy stuff on the device.
7 Do keep the device in the ventilation environment , do not cover it with
cloth when working.
8 Do not clean the surface of the device with chemicals.
9 Do not disassemble the device by your own.

D3.0 Cable Modem VX-CM790
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Unpacking Package Contents
Unpack the items in your VX-CM790 Cable Modem contents and confirm that
no items are missing or damaged. Your package should include:
‹ One VX-CM790 Cable Modem Gateway
‹ One Power adapter (12V/0.8A)
‹ One Category 6 Ethernet cable
‹ One User Manual
If any items are missing or damaged, please contact your place of purchase.
Keep the carton, including the original packing material, in case you need to
store the product or return it.

D3.0 Cable Modem VX-CM790
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Interface Description:
Item
Color
Action
Description
Power
Green
On/Off
Power on/off
DS
Green
Blink
Searching for downstream
On
Downstream locked
US
Green
Blink
Searching for upstream
On
Upstream locked
Online
Green
Blink
Registering to Front‐End
On
Modem is online
Link
Green
Off
The LAN is disconnected
On
The LAN is connected
Blink
The LAN is transferring data
Rear Panel
④③②①
Item
Description
1—RF Input
F‐type female connector
2—LAN Port
RJ‐45 Ethernet port2
3—RST
CM Reset
4—POWER
Power port ,+12V input
Front Panel

D3.0 Cable Modem VX-CM790
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Cable Modem Spec.
Section
Parameter
Specification
Interface
Input
F‐Type RF connector
Ethernet
2 10/100 BASE‐T
Down
stream
Input Frequency
range
N.A
88 MHz to 1002 MHz
Euro
108MHz to 1002MHz
Modulation
64QAM/256QAM
Input level
‐17dBmV to +13dBmV @64QAM
‐13dBmV to +17dBmV @256QAM
Data rate
N.A
8 channels MAX 320Mbps
Euro
8 channels MAX 400Mbps
Bandwidth
N.A
6MHz(Alpha=0.18 for 64QAM)
6MHz(Alpha=0.12 for 256QAM)
Euro
8MHz(ALpha=0.15 for 64QAM &256QAM)
Channel Bonding
Support 8 channels MAX
Input impedance
75 ohms
Input return loss
<‐8dB
Up
stream
Output
Frequency
range
N.A
5 MHz to 42MHz
Euro
5 MHz to 65MHz
Output level
Modulation
Min Output Level
Single channel
MAX level
4 channels MAX
level
1280Mbps
5120Mbps
TDMA/S‐CDMA
TDMA/S‐CDMA
QPSK
17dBmV
23dBmV
61/56dBmV
55/53dBmV
8QAM
17dBmV
23dBmV
58/56dBmV
52/53dBmV
16QAM
17dBmV
23dBmV
58/56dBmV
52/53dBmV
32QAM
17dBmV
23dBmV
57/56dBmV
51/53dBmV
64QAM
17dBmV
23dBmV
57/56dBmV
51/53dBmV
128QAM(S‐CDMA)
17dBmV
23dBmV
‐/56dBmV
‐/53dBmV
Mod Rate
160KHz,320KHz,640KHz,1280KHz,2560KHz,5120KHz
Data Rate
4channels MAX 120Mbps
Bandwidth
200KHz,400KHz,800KHz,1600KHz,3200KHz,6400KHz
Input
impedance
75 ohms
Input Return
loss
<‐10 dB

D3.0 Cable Modem VX-CM790
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General Spec.
Section
Specification
Power Supply
Input :100~240V,50/60Hz:
Output: 12V 5% 0.8A
Working
Environment
Operating free‐air temperature range 0°C to +45 °C
Storage ‐20°C to +85 °C
Cable Modem Configuration
After your computer get access to the device wired or wireless, enter the address
http://192.168.100.1 in the address bar of the browser. Then you can check the Cable
modem status.
‹ Cable Modem Status
‹ Downstream Status

D3.0 Cable Modem VX-CM790
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‹ Upstream Status

D3.0 Cable Modem VX-CM790
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Q & A
Q: Why is Power LED off ？
¾ Check your power supply
¾ Plug and unplug your power supply t
Q: Why is Ethernet LED off？
¾ Check your CAT‐5 wire.
¾ Check the connection of your RJ‐45 to CAT‐5 wire
¾ Check your net‐card in your computer
Q: Why is Online LED off？
¾ Check the connection of your RF‐cable to the device
¾ Check the cable‐network function is available
Q: Should I turn off the device when I am off of Internet?
¾ The device has been specially designed to operate for several years. It does not need to
turn off the power. However, if you do not use the modem ,it is recommended to turn
off the power to extend the life of the device. DO NOT unplug the cable directly, you
should turn off the related electrical outlet, then unplug the cable.
Q: How to find what causes the device not boot?
¾ The LEDS Status of the device indicator can reflect on whether the device boot normally.
If the status indicator is not displayed correctly, refer to the following steps :
¾ Make sure that the Cable Modem and CATV coaxial cable connections are secure, and
there is no damage, loose joints, etc.。
¾ Check cable TV reception is normal, if the effect of television programs significantly
worse than the program or simply watch, call your cable customer service center.
¾ Check Power adapter is connected correctly to 220V AC and to the device
¾ Turn off the power, restart the device
Q: Can multiple computers use one device?
¾ At most 16 equipment can connect to the device, but also the MSO setup determine the
capacity