NETGEAR Nighthawk CM2500 Bedienungsanleitung
User Manual
Nighthawk® CM2500 Cable Modem
Model CM2500
NETGEAR, Inc.
350 E. Plumeria DriveJanuary 2022
San Jose, CA 95134, USA202-xxxxx-01
Support
Thank you for purchasing this NETGEAR product.
You can visit https://www.netgear.com/support/ to register your product, get help,
access the latest downloads and user manuals, and join our community. We recommend
that you use only official NETGEAR support resources.
Contact your Internet service provider for technical support.
Trademarks
©NETGEAR, Inc. NETGEAR and the NETGEAR Logo are trademarks of NETGEAR, Inc.
Any non-NETGEAR trademarks are used for reference purposes only.
Compliance and Conformity
For regulatory compliance information, visit https://www.netgear.com/about/regulatory/.
See the regulatory compliance document before connecting the power supply.
Note to CATV system Installer- This reminder is provided to call the CATV systems
installer's attention to Section 820-93 of the National Electrical Code which provide
guidelines for proper grounding and in particular, specify that Coaxial cable shield shall
connected to the grounding system of the building, as close to the point of cable entry
as practical
2
Nighthawk CM2500 Cable Modem
Contents
Chapter 1 Hardware Setup
Front Panel and LEDs...........................................................................5
Rear Panel..............................................................................................6
Label.......................................................................................................8
System Requirements...........................................................................8
Install and Activate Your Cable Modem............................................9
Connect Your Cable Modem to a Computer...............................9
Activate Your Internet Service......................................................10
Perform a Speed Test....................................................................12
Chapter 2 Manage Your Network
Log in to the cable modem...............................................................14
Change the admin password............................................................14
View cable modem initialization.......................................................15
View cable modem status..................................................................16
View and clear event logs..................................................................16
Specify the cable connection starting frequency...........................17
Ethernet Port Aggregation................................................................17
Set Up Ethernet Port Aggregation...................................................18
View the Ethernet Port Aggregation Status....................................18
Change the Ethernet Port Aggregation Configuration Mode......19
Reboot the cable modem..................................................................19
Reset the cable modem to factory default settings........................20
Use the reset button on the back panel..........................................21
Use the factory reset software button..............................................21
Chapter 3 Troubleshooting
Use LEDs to Troubleshoot.................................................................23
Cannot log in to the cable modem..................................................24
Troubleshoot the cable internet connection..................................25
Chapter 4 Supplemental Information
Factory Settings..................................................................................27
Technical Specifications.....................................................................27
3
Front Panel and LEDs
The cable modem provides status LEDs on the front.
Figure 1. Front panel
You can use the LEDs to verify status and connections. The following table lists and
describes each LED on the cable modem.
User Manual5Hardware Setup
Nighthawk CM2500 Cable Modem
Table 1. LED descriptions
DescriptionIconLED
•Solid white. Power is supplied to the cable modem.
•Off. No power is supplied to the cable modem.
•Solid red. The cable modem is too warm and might overheat. For
more information about this condition, see Use LEDs to Troubleshoot
on page 23.
Power
•Solid amber. One downstream channel is locked.
•Solid white. Two or more downstream channels are locked.
•Blinking white. The cable modem is scanning for a downstream
channel.
•Off. No downstream channel is locked.
Downstream
•Solid amber. One upstream channel is locked.
•Solid white. Two or more upstream channels are locked.
•Blinking white. The cable modem is scanning for an upstream
channel.
•Off. No upstream channel is locked.
Upstream
•Solid white. The cable modem is online.
•Blinking white. The cable modem is synchronizing with the cable
provider’s cable modem termination system (CMTS).
•Off. The cable modem is offline.
Online
•Solid white. A 1 Gbps connection is established.
•Solid amber. A 10 Mbps or 100 Mbps connection is established.
•Blinking white or amber. The port is sending or receiving traffic.
•Off. No device is connected to the port.
Eth1 and Eth2
Rear Panel
The connections and button on the rear panel are shown in the following figure.
User Manual6Hardware Setup
Nighthawk CM2500 Cable Modem
Figure 2. Rear panel
Viewed from top to bottom, the back panel contains the following components:
•Reset button. Pressing the Reset button resets the cable modem. If the Reset button
is pressed for at least seven seconds, the Power LED blinks white and the cable
modem returns to its factory settings.
•Aggregate Ethernet ports. If a device supports Ethernet aggregation like a NAS
or managed network switch, you can use the Ethernet aggregate ports to cable the
device to your cable modem. Use two Ethernet cables to connect these ports to the
aggregated ports on a target network device.
•Coaxial cable port. Connect the cable port to a cable wall outlet.
•DC power connector. Connect the power adapter that came in the product package
to the DC power connector.
User Manual7Hardware Setup
Nighthawk CM2500 Cable Modem
Label
The cable modem label shows the login information, MAC address, and serial number.
Figure 3. Cable modem label
System Requirements
You need the following to install your cable modem:
•Compatible operating system:
- Windows 10
- Windows 8
- Windows 7
- Windows Vista
- Windows XP
- Windows 2000
- Mac OS
- Other operating systems running a TCP/IP network
•Compatible web browser:
-Microsoft Internet Explorer 5.0 or later
-Firefox 2.0 or later
-Safari 1.4 or later
- Google Chrome 11.0 or later
•Cable broadband Internet service
User Manual8Hardware Setup
Nighthawk CM2500 Cable Modem
Install and Activate Your Cable Modem
The cable modem provides a connection between your cable Internet provider’s network
and your computer, router, or WiFi router.
Connect Your Cable Modem to a Computer
After you install the cable modem and activate your Internet service, you can disconnect
the computer and connect a router to the cable modem.
To connect your cable modem directly to a computer:
1. Turn off and disconnect existing modems and routers.
If you are replacing a modem that is currently connected in your home, unplug the
modem and plug the new cable modem into the same outlet.
2. Connect a coaxial cable.
Use a coaxial cable to connect the cable port on the cable modem to a cable wall
outlet. Make sure that the cable is tightly connected. We recommend that you connect
your cable modem directly to a cable wall outlet.
If you must share the connection, use a 3.5dB (1 to 2) splitter.
3. Connect the power adapter to the cable modem and plug the power adapter into
an electrical outlet.
The cable modem might reset multiple times when it is powered on.
User Manual9Hardware Setup
Nighthawk CM2500 Cable Modem
4. Wait for the cable modem to come online.
The cable modem comes online when the Internet LED stops blinking and lights
solid white. This process might take up to 10 minutes.
After 10 minutes, if the Online LED doesn’t light solid, make sure that the cable outlet
is working or call your Internet service provider (ISP) to make sure you have service.
Note: When the Online LED lights solid, your cable modem is not connected to the
Internet yet. You must connect a router or computer to your cable modem and then
activate your cable modem with your cable Internet provider.
5. Connect a router to your cable modem.
a. Connect the LAN port on the cable modem to the WAN or Internet port on the
router.
b. Your cable modem comes with two plugs that cover the Ethernet 1 and Ethernet
2 ports. You can remove the plugs to connect a router that supports Ethernet
port aggregation. For more information, see Ethernet Port Aggregation on page
17.
c. Power on the router.
d. Connect your computer or mobile device to the router.
6. Reboot the computer.
Activate Your Internet Service
Before you activate your Internet service, gather the following information:
•Your cable Internet provider account information
•Cable modem model number, which is CM2500
User Manual10Hardware Setup
Nighthawk CM2500 Cable Modem
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