Motorola MB7621 Cable Modem user manual
- June 7, 2024
- Cox
Table of Contents
Motorola MB7621 Cable Modem
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Modem Information
DOCSIS 3.0 modem
24×8 channel bonding
To achieve Gigablast or Ultimate Classic speeds, a DOCSIS 3.1 modem is required
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Highest Service Level
Ultimate 500
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Front View
| | After the cable modem is successfully registered on the network, the Power , Downstream , Upstream , and Online indicators illuminate continuously to indicate that the cable modem is online and fully operational.| | |
Back View
| | The Motorola MB7621 has the following ports and buttons available on the back of the modem.
- RESET – Press and hold this recessed button at least 10 seconds to restore to factory defaults and reboot the modem (login/Reset instructions)
- ETHERNET – Connects devices to Ethernet ports
- COAX – Connects to a coaxial cable
- ON / OFF – Turns the modem on and off
- POWER – Connects to the power adapter
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MAC Address
| | MAC addresses are written as 12 digits containing both letters and numbers (0-9, A-F).A MAC address is unique. The first six characters of the MAC address are unique to the manufacturer of the device.
Troubleshooting
The modem lights indicate the current status of your cable modem. To troubleshoot any connection problems, use the table below.
| Gateway Light | Status | Problem |
|---|
Power
| On| None – the modem is powered on
Off| No power. Verify power supply connections and electrical outlet. Ensure
the outlet is not connected to a switch. Press the ON/OFF button on the
back of the modem to ensure it is turned on.
Downstream
| Solid Blue| None – multiple downstream channels are in use
Blinking Blue| Negotiating multiple downstream bonded channels. Verify all
cable connections and try resetting the modem.
Solid Green| None – one downstream channel is in use
Blinking Green| Scanning for downstream channels. Verify all cable connections
and try resetting the modem.
Upstream
| Solid Blue| None – multiple upstream channel is in use
Blinking Blue| Negotiating multiple upstream bonded channels. Verify all cable
connections and try resetting the modem.
Solid Green| None – one upstream channel is in use
Blinking Green| Scanning for an upstream channel. Verify all cable connections
and try resetting the modem.
Off| No upstream channels are in use. Verify all cable connections and try
resetting the modem.
Online
| On| None – the modem is online
Blinking| None – the modem is registering a connection
Off| The modem is offline. Verify all cable connections and try resetting the
modem.
Ethernet LAN Ports
| Green| None – a device is connected to the Ethernet port and is using 1
Gbps LAN speed
Amber| None – a device is connected to the Ethernet port and is using 10 or
100 Mbps LAN speed
Blinking| None – data is being transferred over the Ethernet connection
Off| No device is connected or the device is disabled. Verify all cable
connections and try resetting the modem.
Manufacturer Resources
For more detailed technical information on the MB7621, use the resources below.
- Motorola_MB7621_Data_Sheet [PDF]
- Motorola_MB7621_QS [PDF]
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