Arris TM502G Overview
The Arris Touchstone TM502G is a DOCSIS 2.0 telephony cable modem that delivers two lines of primary Voice over IP (VoIP) phone service along with high-speed internet access. Built on the proven Touchstone TM402 platform, it is a carrier-grade device engineered for dependable phone service, not just data.
A single internal battery slot supports two battery pack options, keeping your phone line active during extended power outages. Long-life lithium-ion battery technology and software-configurable battery management keep operating costs low.
Key Features
- Two lines of primary VoIP phone service plus high-speed data through one device
- Single battery slot with two battery pack options for phone service during extended power outages
- Long-life lithium-ion battery technology with software-configurable battery management and reporting
- Boost Current and Automatic Gain compensation for tones and signals (FSK/CAS) for broad phone equipment compatibility
- DOCSIS 2.0 certified, backward compatible with DOCSIS 1.1 and 1.0 networks
- One 10/100 Ethernet port and one USB port for wired connections
Built-In VoIP Phone Service
Unlike a standard cable modem, the TM502G includes an embedded multimedia terminal adapter (eMTA) with two RJ11 telephone ports, so your provider can deliver home phone and internet through a single device. Arris uses one firmware platform across all Touchstone telephony modems, which means consistent call quality and the reliability phone service demands: an occasional reboot may be tolerable for a data connection, but never for your phone line.
Specifications
| DOCSIS Standard |
DOCSIS 2.0, backward compatible with 1.1 and 1.0 |
| Max Speeds |
Up to 38 Mbps download, 30 Mbps upload |
| Best For |
Legacy accounts and plans up to about 30 Mbps |
| Phone Lines |
2 primary VoIP lines (embedded eMTA) |
| Telephone Ports |
2 x RJ11 |
| Ethernet Port |
1 x 10/100 Mbps |
| USB Port |
1 x USB Type B |
| Battery Backup |
Single slot, supports two battery pack options |
| Wi-Fi |
None, pair with a separate router |
What's Included
- Arris TM502G Telephony Cable Modem
- Ethernet Cable
- Power Supply
- Online Installation Manual
Will this work with my internet company?
The Arris TM502G is primarily used with Mediacom internet and phone service, most often on longstanding accounts that still include cable phone service. Because this is a DOCSIS 2.0 device, it is best suited to legacy plans and lower speed tiers, and some current plan speeds are not supported.
Always contact your service provider's customer service before placing your order to confirm this model will work with your account and plan. If you are on a newer or faster Mediacom plan, see our guide to Mediacom approved modems by speed tier for current options.
Skip the Monthly Rental Fee
Mediacom charges up to $14 per month to rent equipment, which adds up to about $168 per year. Owning your own modem means a professionally refurbished TM502G can pay for itself within a few months.
Setup and Activation
- Connect the coaxial cable from your wall outlet to the Cable port on the modem.
- Plug in the power supply and wait a few minutes for the status lights to stabilize.
- Connect your telephone to the Tel 1 port (use Tel 2 for a second line).
- Connect your computer or router to the Ethernet port.
- Call your provider to activate the modem. Have the MAC address and serial number from the label ready.
Frequently Asked Questions
Is the Arris TM502G compatible with Mediacom?
Yes, the TM502G has historically been used with Mediacom internet and phone service in most areas, mainly on legacy accounts. Confirm with Mediacom customer service before ordering, since some current plans and speeds are not supported.
What internet speeds does the TM502G support?
As a DOCSIS 2.0 modem, the TM502G supports download speeds up to about 38 Mbps and uploads up to about 30 Mbps. It is a good match for legacy plans of 30 Mbps or less, not for modern high-speed tiers.
How many phone lines does the TM502G support?
Two. The built-in eMTA provides two primary VoIP phone lines through two RJ11 telephone ports.
Does the TM502G have built-in Wi-Fi?
No. The TM502G is a modem only. To create a wireless network, connect a separate router to its Ethernet port.
Does the TM502G come with a backup battery?
The TM502G has a single internal battery slot that supports two battery pack options. Refurbished units ship with the accessories listed in the What's Included section above. Without a battery installed, the modem runs normally on AC power, but phone service will not continue during a power outage.
Should I buy a DOCSIS 2.0 modem in 2026?
Only for a specific legacy setup, usually an older account with cable phone service that still supports this model. For current internet plans, a DOCSIS 3.1 modem is the better choice. Browse our Mediacom compatible modems for newer options.
