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T25
User Manual
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Arris T25 User Manual

SURFboard® T25 Cable Modem with Xfinity Voice
User Guide, STANDARD Revision 2.0
P/N 365-095-33655

CommScope legal statements

©
2019 CommScope, Inc. All rights reserved
Export restrictions
These products and associated technical data (in print or electronic form) may be subject to export control laws of the United States of America. It is your responsibility to determine the applicable regulations and to comply with them. The following notice is applicable for all products or technology subject to export control:
These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.
Disclaimer
THIS CONTENT AND ASSOCIATED PRODUCTS OR SERVICES (“MATERIALS”), ARE PROVIDED “AS IS” AND WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED. TO THE FULLEST EXTENT PERMISSIBLE PURSUANT TO APPLICABLE LAW, CommScope DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, FREEDOM FROM COMPUTER VIRUS, AND WARRANTIES ARISING FROM COURSE OF DEALING OR COURSE OF PERFORMANCE. CommScope does not represent or warrant that the functions described or contained in the Materials will be uninterrupted or error-free, that defects will be corrected, or are free of viruses or other harmful components. CommScope does not make any warranties or representations regarding the use of the Materials in terms of their completeness, correctness, accuracy, adequacy, usefulness, timeliness, reliability or otherwise. As a condition of your use of the Materials, you warrant to CommScope that you will not make use thereof for any purpose that is unlawful or prohibited by their associated terms of use.
Limitation of liability
IN NO EVENT SHALL CommScope, CommScope AFFILIATES, OR THEIR OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, SUPPLIES, LICENSORS AND THIRD PARTY PARTNERS, BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER, EVEN IF CommScope HAS BEEN PREVIOUSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN AN ACTION UNDER CONTRACT, TORT, OR ANY OTHER THEORY ARISING FROM YOUR ACCESS TO, OR USE OF, THE MATERIALS. Because some jurisdictions do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of liability for consequential or incidental damages, some of the above limitations may not apply to you.
Trademarks
ARRIS and the ARRIS Logo are trademarks of CommScope, Inc. and/or its affiliates. All other trademarks are the property of their respective owners.
SURFboard® T25 Cable Modem with Xfinity Voice User Guide STANDARD Revision 2.0 2
SURFboard® T25 Cable Modem with Xfinity Voice User Guide STANDARD Revision 2.0 3

Table of contents

Chapter 1: Safety and regulatory information...........................................6
Important safety instructions......................................................................................... 6
FCC statements...............................................................................................................8
FCC interference statement................................................................................. 8
FCC declaration of conformity............................................................................. 8
FCC radiation exposure statement.......................................................................8
Care for the environment by recycling.......................................................................... 9
Chapter 2: Getting started...................................................................... 10
About your T25.............................................................................................................10
In the box..................................................................................................................... 10
Additional item(s) needed (not included)..........................................................11
System requirements....................................................................................................11
Contact Information..................................................................................................... 12
Chapter 3: Product overview.................................................................. 13
Front panel................................................................................................................... 13
Indicator lights for the T25................................................................................ 14
Rear panel.....................................................................................................................15
Backup power.....................................................................................................16
Telephony cable modem label..................................................................................... 17
Chapter 4: Installing the T25...................................................................18
Install the T25...............................................................................................................18
Connect your telephone.................................................................................... 19
Establish an Internet connection..................................................................................19
Chapter 5: Using the cable modem web manager................................... 22
T25 web manager menu links......................................................................................22
View the T25 network connection status.................................................................... 22
Status screen...................................................................................................... 22
Event log screen.................................................................................................23
HW/FW versions screen.....................................................................................25
Registration status (CM state)............................................................................25
Chapter 6: Managing your telephony cable modem and connected
networks............................................................................................. 27
Reboot and reset the T25............................................................................................ 27
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Reboot (or restart) your T25 using the Reset button........................................ 27
Reset the T25 configuration using the Reset button......................................... 28
Exit the T25 web manager........................................................................................... 28
Chapter 7: Troubleshooting tips..............................................................29
Solutions....................................................................................................................... 29
Front panel LED icons and error conditions.................................................................30
Chapter 8: Warranty information............................................................31
SURFboard® T25 Cable Modem with Xfinity Voice User Guide STANDARD Revision 2.0 5

Safety and regulatory information

Read all safety and regulatory information before installing your cable modem and setting up your home network connection.

Important safety instructions

Read This Before You Begin — When using your equipment, basic safety precautions should always be followed to reduce the risk of fire, electric shock, and injury to persons, including the following:
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Read all of the instructions listed here and/or in the user manual before you operate this device. Give particular attention to all safety precautions. Retain the instructions for future reference.
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This device must be installed and used in strict accordance with manufacturer’s instructions, as described in the user documentation that is included with the device.
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Comply with all warning and caution statements in the instructions. Observe all warning and caution symbols that are affixed to this device.
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To prevent fire or shock hazard, do not expose this device to rain or moisture. The device must not be exposed to dripping or splashing. Do not place objects filled with liquids, such as vases, on the device.
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This device was qualified under test conditions that included the use of the supplied cables between system components. To ensure regulatory and safety compliance, use only the provided power and interface cables and install them properly.
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Different types of cord sets may be used for connections to the main POWER supply circuit. Use only a main line cord that complies with all applicable device safety requirements of the country of use.
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Installation of this device must be in accordance with national wiring codes and conform to local regulations.
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Operate this device only from the type of power source indicated on the device’s marking label. If you are not sure of the type of power supplied to your home, consult your dealer or local power company.
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Do not overload outlets or extension cords, as this can result in a risk of fire or electric shock. Overloaded electrical outlets, extension cords, frayed power cords, damaged or cracked wire insulation, and broken plugs are dangerous. They may result in a shock or fire hazard.
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Route power supply cords so that they are not likely to be walked on or pinched by items placed upon or against them. Pay particular attention to cords where they are attached
Chapter 1
SURFboard® T25 Cable Modem with Xfinity Voice User Guide STANDARD Revision 2.0 6
Chapter 1: Safety and regulatory information
to plugs and convenience receptacles, and examine the point where they exit from the device.
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Place this device in a location that is close enough to an electrical outlet to accommodate the length of the power cord.
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Place the device to allow for easy access when disconnecting the power cord of the device from the electrical wall outlet.
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Do not connect the plug into an extension cord, receptacle, or other outlet unless the plug can be fully inserted with no part of the blades exposed.
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Place this device on a stable surface.
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Avoid damaging the device with static by touching the coaxial cable when it is attached to the earth-grounded coaxial cable-TV wall outlet.
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Always first touch the coaxial cable connector on the device when disconnecting or reconnecting the Ethernet cable from the device or user’s PC.
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It is recommended that the customer install an electrical surge protector in the electrical outlet to which this device is connected. This is to avoid damaging the device by local lightning strikes and other electrical surges.
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Postpone installation until there is no risk of thunderstorm or lightning activity in the area.
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Do not use this product near water: for example, near a bathtub, washbowl, kitchen sink or laundry tub, in a wet basement, or near a swimming pool.
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Do not cover the device or block the airflow to the device with any other objects. Keep the device away from excessive heat and humidity and keep the device free from vibration and dust.
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Wipe the device with a clean, dry cloth. Never use cleaning fluid or similar chemicals. Do not spray cleaners directly on the device or use forced air to remove dust.
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For added protection, unplug the device from the wall outlet and disconnect the cables to avoid damage to this device during lightning activity or power surges.
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Upon completion of any service or repairs to this device, ask the service technician to perform safety checks to determine that the device is in safe operating condition.
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Do not open the device. Do not perform any servicing other than that contained in the installation and troubleshooting instructions. Refer all servicing to qualified service personnel.
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This device should not be used in an environment that exceeds 104° F (40° C)
SAVE THE ABOVE INSTRUCTIONS
Note to CATV System Installer — This reminder is provided to call the CATV system installer’s attention to Article 820.93 and 820.100 of the National Electric Code, which provides guidelines for proper grounding and specifies that the Coaxial cable shield shall be connected to the grounding system of the building, as close to the point of cable entry as practical.
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FCC statements

FCC interference statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the device off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
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Reorient or relocate the receiving antenna.
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Increase the separation between the device and receiver.
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Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
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Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.
FCC Caution: Any changes or modifications not expressly approved by ARRIS for compliance could void the user’s authority to operate the equipment.
Chapter 1: Safety and regulatory information

FCC declaration of conformity

ARRIS Enterprises, LLC, 3871 Lakefield Drive, Suwanee, GA 30024, declares that the SURFboard DOCSIS 3.1 Cable Modem with Xfinity Voice-T25 complies with 47 CFR Parts 2 and 15 of the FCC rules as a Class B digital device.

FCC radiation exposure statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. To comply with the FCC RF exposure compliance requirements, the separation distance between the antenna and any person’s body (including hands, wrists, feet and ankles) must be at least 8 inches (20.3 centimeters).
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter except those already approved in this filing.
The availability of some specific channels and/or operational frequency bands are country dependent and are firmware programmed at the factory to match the intended destinations. The firmware setting is not accessible by the end user.
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Chapter 1: Safety and regulatory information

Care for the environment by recycling

When you see this symbol on an ARRIS product, do not dispose of the product with residential or commercial waste.
Recycling your ARRIS Equipment
Please do not dispose of this product with your residential or commercial waste. Some countries or regions, such as the European Union, have set up systems to collect and recycle electrical and electronic waste items. Contact your local authorities for information about practices established for your region. If collection systems are not available, call ARRIS Technical Support at 1-877-466-8646 for assistance.
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Getting started

The SURFboard T25 is a combination DOCSIS 3.1 telephony cable modem with two Voice­over-IP (VoIP) telephone lines. It uses DOCSIS 3.1 technology to provide ultra high-speed Internet access on your home or small business network.
For whole home connectivity, use the T25 Ethernet port to add a Wi-Fi router (separate purchase)
Using the connection capabilities of the T25, you can connect your computer and other network-enabled devices via the two Ethernet ports. The T25 connects to the existing coaxial coaxial cable connection in your home.
Note: For Internet connections, you need a cable service connection with a cable Internet Service Provider. The T25 will not work with DSL or satellite Internet service.
This guide provides instructions for installing your T25.
Chapter 2

About your T25

The T25 telephony modem is DOCSIS 3.1 compliant with the following features:
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Speed: much faster than dialup or ISDN service; up to eight times faster than DOCSIS 2.0 cable modems.
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Connectivity: supports Ethernet connection.
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Flexibility: provides two lines of telephone service as well as high-speed data.
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Compatibility: Data services: DOCSIS 3.0 compliant ; supports tiered data services (if offered by your service provider).
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Telephony services: Packet Cable™ 2.0 compliant.

In the box

Before installing the T25, check that the following items are also included in the box. If any items are missing, please call ARRIS Technical Support at 1-877-466-8646 for assistance.
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Chapter 2: Getting started
Table 1: T25 package contents
Item Description
T25 Telephony Cable Modem High-speed DOCSIS 3.1 telephony cable
modem with two-port Ethernet
Power Adapter Power cord for an electrical wall outlet
connection
Ethernet Cable Standard Category 5E (CAT5E)
Software License & Regulatory Card
Support Information Card Provides contact information for obtaining
T25 Quick Start Guide Provides basic information for installing the
Safety and regulatory information, software license, and warranty for the gateway
technical support assistance with any issues you may have with your SURFboard device.
gateway and setting up a secure connection on your home network.

Additional item(s) needed (not included)

The following item is not included in the box and must be purchased separately, if required:
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Coaxial (coax) cable, if one is not already connected to a cable wall outlet
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RF splitter (for additional coaxial cable connections, such as a set-top box or Smart TV
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Ethernet cable for each additional Ethernet-enabled device

System requirements

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High-speed Internet access account
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Web browser access – Internet Explorer, Google Chrome, Firefox, or Safari
SURFboard® T25 Cable Modem with Xfinity Voice User Guide STANDARD Revision 2.0 11
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