
C4000 features (all versions)
Secure WiFi compatible
WiFi 6 technology with dual-band 2.4 GHz and 5 GHz 802.11ax
Smart Connect single wireless network (SSID) to auto-select the fastest band for each device
Single LED status light
Dynamic QoS to prioritize data through the router for smoother streaming
Standards-based WiFi WPA3 security
You can choose the appropriate version of this router based on your type of internet connection and its specific requirements.

C4000 features (all versions)
Secure WiFi compatible
WiFi 6 technology with dual-band 2.4 GHz and 5 GHz 802.11ax
Smart Connect single wireless network (SSID) to auto-select the fastest band for each device
Single LED status light
Dynamic QoS to prioritize data through the router for smoother streaming
Standards-based WiFi WPA3 security
You can choose the appropriate version of this router based on your type of internet connection and its specific requirements.

C4000 features (all versions)
Secure WiFi compatible
WiFi 6 technology with dual-band 2.4 GHz and 5 GHz 802.11ax
Smart Connect single wireless network (SSID) to auto-select the fastest band for each device
Single LED status light
Dynamic QoS to prioritize data through the router for smoother streaming
Standards-based WiFi WPA3 security
You can choose the appropriate version of this router based on your type of internet connection and its specific requirements.
Works with the following Brightspeed internet services:
ADSL2: Up to 40 Mbps with pair-bonding
VDSL: Up to 140 Mbps with pair-bonding
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
The C4000BG has the same specifications as the Zyxel C4000BZ.
Works with the following Brightspeed internet services:
ADSL2: Up to 40 Mbps with pair-bonding
VDSL: Up to 140 Mbps with pair-bonding
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
The C4000BG has the same specifications as the Zyxel C4000BZ.
Works with the following Brightspeed internet services:
ADSL2: Up to 40 Mbps with pair-bonding
VDSL: Up to 140 Mbps with pair-bonding
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
The C4000BG has the same specifications as the Zyxel C4000BZ.
Works with these Brightspeed internet services:
ADSL: Up to 7 Mbps
ADSL2: Up to 20 Mbps
VDSL: Up to 100 Mbps
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
The C4000LG has the same specifications as the Zyxel C4000LZ.
Works with these Brightspeed internet services:
ADSL: Up to 7 Mbps
ADSL2: Up to 20 Mbps
VDSL: Up to 100 Mbps
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
The C4000LG has the same specifications as the Zyxel C4000LZ.
Works with these Brightspeed internet services:
ADSL: Up to 7 Mbps
ADSL2: Up to 20 Mbps
VDSL: Up to 100 Mbps
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
The C4000LG has the same specifications as the Zyxel C4000LZ.
Works with these Brightspeed internet services:
Fiber (GPON): Up to 940 Mbps
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
C4000XG diagram
Works with these Brightspeed internet services:
Fiber (GPON): Up to 940 Mbps
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
C4000XG diagram
Works with these Brightspeed internet services:
Fiber (GPON): Up to 940 Mbps
Note: Listed speeds reflect the maximum download speed the technology can deliver on Brightspeed services. Speeds may differ based on router setup, devices and other factors.
C4000XG diagram
Modem troubleshooting tips
Did you know? If your internet connection is spotty or slow, the best place to start is rebooting your modem.
Still not running right? Check to see if you need to update the modem's firmware.
Download the Latest Firmware for C4000BG
Download the Latest Firmware for C4000LG
Download the Latest Firmware for C4000LZ
Download the Latest Firmware for C4000BZ
Download the Latest Firmware for C4000XG
Tip: If the firmware link doesn't work, try another browser.
Note: Chrome is known to have issues with this type of link.
Right-click the link.
Select "Copy Link Address."
Paste the link into a new browser window or tab.
Modem troubleshooting tips
Did you know? If your internet connection is spotty or slow, the best place to start is rebooting your modem.
Still not running right? Check to see if you need to update the modem's firmware.
Download the Latest Firmware for C4000BG
Download the Latest Firmware for C4000LG
Download the Latest Firmware for C4000LZ
Download the Latest Firmware for C4000BZ
Download the Latest Firmware for C4000XG
Tip: If the firmware link doesn't work, try another browser.
Note: Chrome is known to have issues with this type of link.
Right-click the link.
Select "Copy Link Address."
Paste the link into a new browser window or tab.
Modem troubleshooting tips
Did you know? If your internet connection is spotty or slow, the best place to start is rebooting your modem.
Still not running right? Check to see if you need to update the modem's firmware.
Download the Latest Firmware for C4000BG
Download the Latest Firmware for C4000LG
Download the Latest Firmware for C4000LZ
Download the Latest Firmware for C4000BZ
Download the Latest Firmware for C4000XG
Tip: If the firmware link doesn't work, try another browser.
Note: Chrome is known to have issues with this type of link.
Right-click the link.
Select "Copy Link Address."
Paste the link into a new browser window or tab.