C3510XZ modem user guide

Features of the C3510XZ

  • WiFi 6 technology with dual-band 2.4 GHz and 5 GHz 802.11 ax (backwards compatible with 802.11 a/b/g/n/ac)
  • Auto channel selection
  • Up to 4 wireless networks (SSIDs)
  • WPS / WPS 2.0 compatible
  • IPv4 / IPv6 compatible
  • WPA2-PSK security
C3510XZ modem front angle view

Speed specifications

This gateway is tested and certified to run up to 940 Mbps on the Quantum Fiber network. 


Note: Speeds reflect the maximum download speed the technology can deliver Quantum Fiber service. Your speeds may differ based on router setup, devices, and other factors. 

Diagram of a C3510XZ

C3510XZ diagram of front lights and rear ports

Top troubleshooting tips

  • Connection issues? Restarting your modem is a good first step to fix many common problems.
  • Tried restarting and still having trouble? Learn more about resetting the modem to its default settings.
  • Need more help? Our troubleshooting team is standing by. Contact us through your Quantum Fiber app, or by signing in to your account.

Using the C3510XZ modem settings

Installation and getting connected

This modem must be installed and set up by a technician to activate your internet service. Once the connection is established, you can start connecting devices to your home network.

The Network Settings menu gives you access to several options, listed below. Broadband and Wireless options are the most commonly used.

  • Broadband (this is where your tech will set up the WAN connection during installation)
  • Wireless
  • Home Networking
  • Routing
  • QoS (Quality of Service)
  • NAT (Network Address Translation)
  • DNS (Domain Name System)
  • Vlan Group
  • Interface Grouping
Zyxel modem settings - Network Settings menu

Helpful WiFi topics

The Security menu allows you to view settings to control access to your home network, including these options: 

  • Firewall
  • MAC Filter
  • Parental Control - see next section for details
  • Scheduler Rule
  • Certificates
Zyxel modem settings - Security menu

Parental Control allows you to define users within your household and set limits on when they have access to WiFi.

1. Start by using the slider button at the top to enable Parental Control. Blue means it is enabled; gray means it is disabled.

2. From here you can click 'Add more profiles' to create new user profiles for your household members. You can also turn existing profiles on or off with the slider, or select the arrow at the bottom to edit controls you have already created.

Zyxel modem settings - Parental Controls 1

3. To create a new profile, type the name of the user into the box on the left, and make sure the slider is blue to indicate 'Active.' Under 'Profile Device List,' you will be able to check and modify the list of devices that person uses. Then click 'Next' to set up a schedule.

Zyxel modem settings - Parental Controls 2

4. Modify an existing schedule, or click 'Add New Schedule.' Then you can set hours and days that the user will be blocked from online access. When you are finished, click 'Save.'

Zyxel modem settings - Parental Controls 3

Repeat these steps for each user you want to manage.

The System Monitor menu is similar to the "Modem Status" menu you may have seen on other modems. It allows you to see various logs and data related to the performance and operation of your modem/router, listed below:

  • Log
  • Traffic Status
  • ARP (Address Resolution Protocol) Table
  • Routing Table
  • Multicast Status
  • WLAN Station Status
Zyxel modem settings - System Monitor menu

The Maintenance menu provides a number of settings and actions that help keep your modem running well over time. The options in bold are the most commonly used.

  • System
  • User Account
  • Remote Management
  • SNMP (Simple Network Management Protocol)
  • Time (check that the system time is correct if you want to set up schedules  through parental controls)
  • E-mail Notification
  • Log Setting
  • Firmware Upgrade
  • Backup/Restore
  • Reboot
  • Diagnostic
Zyxel modem settings - Maintenance menu