Xfinity CGM4981COM XB8 xFi Advanced Gateway Modem

Technical Specifications

Hardware Specifications 

1. WAN Interface – 1 RF F-type
2. LAN interface – 4-port wired Ethernet RJ45, MoCA 2.0 via the F Connector
3. Power Supply – 90-135 VRMS (AC), 57-63 Hz
4. Operating Temperature 0-40 de°Ceceiver Specifications 

1. Downstream Modulation – QAM, O  FDM
2. Downstream Frequency Range 108-1002 MHz or 258-1218MHz
3. Input Signal level range -15/+15 dBmV
4. Input impedance 75ohmsm

Transmitter Specifications 

1. Upstream Modulation QPS K, QAM, OFDMA
2. Upstream Frequency Range – Sub-split (5-85 MHz), High-split (5-208 MHz)
3. Output Impedance 75 ohms

Wi-Fi Specifications 

1. Wi-Fi IEEE 802.11 2.4/5/6 GHz
2. Wi-Fi IEEE 802.11a/b/g/n/ac/ax
3. Wi-Fi Protected Setup

Product Usage Instructions

Safety Instructions:
Before starting the installation or use of the product, carefully read and adhere to the safety instructions provided in the user manual.

• Avoid using the product during an electrical storm to prevent electric shock.
• Do not utilize the product to report gas leaks.
• Use only the supplied power supply unit or approved replacements to prevent hazards.
• Consult the user documentation or contact your service provider for power supply inquiries.
• Avoid mishandling or incorrect replacement of the battery to prevent explosions.

Regulatory Information:
The product complies with Part 15 of the FCC Rules. Ensure that the device does not cause harmful interference and accepts any received interference.

Warranty Information:
Unless approved by Technicolor, avoid disassembling, decompiling, or reverse engineering the product. Contact Technicolor Connected Home LLC for any warranty-related queries.

XB8 CGM4981COM – User Guide
BEFORE YOU START INSTALLATION OR USE OF THIS PRODUCT, CAREFULLY READ ALL SAFETY INSTRUCTIONS

Applicability
These Safety Instructions and Regulatory Notices apply to:

• Technicolor Cable Modems & Gateways

Using equipment safely 

When using this product, always follow the basic safety precautions to reduce the risk of fire, electric shock, and injury to persons, including the following:

• Always install the product as described in the documentation that is included with your product.
• Avoid using this product during an electrical storm. There may be a remote risk of electric shock from lightning.
• Do not use this product to report a gas leak in the vicinity of the leak.

Directives

Product Use

• You must install and use this device in strict accordance with the manufacturer’s instructions as described in the user documentation included with your product.
• Before you start installation or use of this product, carefully read the contents of this document device-specific constraints or rules that may apply in the country in which you want to use this product.
• If you have any doubts about the installation, operation, or safety of this product, please contact your supplier.
• Any change or modification made to this product that is not expressly approved by Technicolor will result in the loss of product warranty and may void the user’s authority to operate this equipment.
• Technicolor disclaims all responsibility in the event of use that does not comply with the
  present instructions.

Safety instructions

• Read these instructions.
• Keep these instructions.
• Heed all warnings and cautions.
• Follow all instructions.

Climatic conditions 

This product:

• It is intended for in-house stationary use; the maximum ambient temperature must not exceed 40 °C (104 °F); the relative humidity must be between 20 and 80 %.
• Must not be mounted in a location exposed to direct or excessive solar and/or heat radiation.
• Must not be exposed to heat-trap conditions and must not be subjected to water or condensation.
• Must be installed in a Pollution Degree 2 environment (an environment where there is no pollution or only dry, non-conductive pollution).
• If applicable, batteries (battery pack or batteries installed) must not be exposed to excessive heat, such as sunshine, fire, or the like.

This product is intended for indoor use only.

Ventilation and positioning
This product is intended to be used indoors in a residential or office environment.

• Remove all packaging material before applying power to the product.
• Place and use the product only in positions as described in the user documentation that is included with your product.
• Never push objects through the openings in this product.
• Do not block or cover any ventilation openings; never stand it on soft furnishings or carpets.
• Leave 7 to 10 cm (3 to 4 inches) around the product to ensure that proper ventilation gets to it.
• Do not install the product near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not put anything on it which might spill or drip into it (for example, lighted candles or containers of liquids). Do not expose it to dripping or splashing, rai,,n or moisture. If a liquid enters the roduct, or if the product has been exposed to rain or moisture, unplug it immediately and contact your supplier or customer service.

Cleaning
Unplug this product from the wall socket and disconnect from all other devices before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.

Water and moisture

• Do not use this product near water, for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool.
• Transition of the product from a cold environment to a warm one may cause condensation on some of its internal parts. Allow it to dry by itself before
  using the product.

Electrical powering

• The powering of the product must adhere to the power specifications indicated on the marking labels.
• In case this product is powered by a power supply unit:
  • For USA: This product is intended to be supplied by an aUL-listed Direct Plug-in Power Unit marked “Class 2” and rated as indicated on the label on your product.
  • This power supply unit must be a Class II and a Limited Power Source by the requirements of IEC 60950-1/EN 60950/1, Clause 2.5 or IEC 62368-1/EN 62368/1, Annex Q and rated as indicated on the label on your product. It must be tested and approved to national or local standards.

Only use the power supply unit that is supplied with this product, is supplied by your service provider or local product supplier, or a replacement power supply unit provided by your service provider or local product supplier.

• The use of other types of power supplies is prohibited.
• If you are not sure of the type of power supply needed, consult the user documentation that is included with your product or contact your service provider or local product supplier.

Accessibility

• The plug on the power supply cord or power supply unit serves as a disconnect device. Be sure that the mains supply socket outlet you use is easily accessible and located as close to the product as possible.
• The power connections to the product and the mains supply socket must be accessible at all times, so that you can always disconnect the product quickly and safely from the mains supply.

Overloading
Do not overload mains supply socket outlets and extension power cords, as this increases the risk of fire or electric shock.

Handling batteries
This product may contain disposable batteries.

CAUTION
There is a danger of explosion if the battery is mishandled or incorrectly replaced.

• Do not disassemble, crush, puncture, short the external contacts, dispose of in fire, or expose to fire, water, or other liquids.
• Insert batteries correctly. There may be a risk of explosion if the batteries are incorrectly inserted.
• Do not attempt to recharge disposable or nonreusable batteries.
• Please follow the instructions provided for charging rechargeable batteries.
• Replace batteries with the same or equivalent type.
• Do not expose batteries to excessive heat (such as sunlight or fire) and temperatures above 100 °C (212 °F).

About this Setup and User Guide 

In this Setup and User Guide 

The goal of this Setup and User Guide is to:

• Set up your Gateway and local network
• Configure and use the main features of your Gateway.

For more advanced scenarios and features, visit the documentation pages on www.technicolor.com.

Used symbols 

The danger symbol indicates that there may be a possibility of physical injury.

The warning symbol indicates that there may be a possibility of equipment damage.

The caution symbol indicates that there may be a possibility of service interruption.

The note symbol indicates that the text provides additional information about a topic.

Terminology
Generally, the XB8 CGM44980COM will be referred to as the Gateway in this Setup and User Guide.

Typographical convention
The following typographical convention is used throughout this manual:

• This sample text indicates a hyperlink to a website.
  Example: For more information, visit us at www.technicolor.com.
• This sample text indicates an internal link.
  Example: If you want to know more about the guide, see “About this Setup and User Guide”.
• This sample text indicates an important content-related word.
  Example: To enter the network, you must authenticate yourself.
• This sample text indicates a GUI element (commands on menus and buttons, dialog box elements, file names, paths, and folders).
  Example: On the File menu, click Open to open a file.

Getting Started

Introduction
This chapter provides a brief overview of the main features and components of the Gateway. After this chapter, we will start with the installation.

Do not connect any cables to the Gateway until instructed to do so.

Features at a glance

Introduction
This section provides a brief overview of the main features of your gateway.

• DOCSIS® 3.1 Certified
• 2 DOCSIS® 3.1 OFDM downstream channels & 2 DOCSIS® 3.1 OFDM upstream channels
• DOCSIS® 3.0 Certified
• 32 x 8 bonded channels in DOCSIS 3.0 mode
• Switchable diplexer for upstream and downstream
• One IEEE 802.3 10/100/1000/2500 Base-T 2.5 Gigabit Ethernet WAN/LAN port with MacSEC
• Three IEEE 802.3 10/100/1000 Base-T Gigabit Ethernet LAN ports
• Wireless networking on board
• IEEE 802.11ax 2.4 GHz Wi-Fi (4×4)
• IEEE 802.11ax 5 GHz Wi-Fi (4×4)
• IEEE 802.11ax 6 GHz Wi-Fi (4×4)
• MoCA 2.0
• Zigbee Radio
• BLE Capable Radio
• Two FXS ports for phone or fax
• PacketCable™ 2.0 and SIP compliant
• IPv6 DS-Lite enabled

Getting to know the Gateway
This section introduces you to the different components of the Gateway:

Front Surface
The front surface contains no indicators or buttons..

Top Panel and LED Indicators

• The top panel contains the single status indicator and the customer logo. Air vents for product ventilation are also present.
• There are no buttons on the top panel.

LED Indicator Table 

Color	State*	Description
White	Solid on	The device is online and functioning
Orange	Solid on	Initial Power Up & Boot
Orange	Blinking	Downstream during Registration

Green	Solid on	Upstream during Registration
Alternate Orange and green	Blinking	Firmware Download in progress
Blue	Blinking	WPS Mode(Times out after 2 minutes)
Red	Solid on	No internet connectivity (has block sync)

Back panel 

Tel port 

The Tel ( ) RJ-11 ports support up to two traditional phones or a DECT base station to connect to the Gateway. Single-line customers can use the Tel 2/Alarm port to connect an auto dial alarm system.

Ethernet Ports
The RJ-45 Ethernet ports support up to four Ethernet connections (for example, a computer) to your local network.

• Three Ethernet ports on the Gateway support Gigabit Ethernet ports and have a maximum speed of 1 Gbps (Gigabit per second).
• One Ethernet port (#4) on the Gateway supports 2.5 Gigabit Ethernet ports and has a maximum speed of 2.5 Gbps (Gigabits per second). Ethernet Port 6 supports WAN or LAN access.
• Each Ethernet port has two LEDs with the following functionality.

Ethernet ports 1 through 3

LED	LED Status	Description
Left LED (Green)	Solid on	1000Mbps Link
	Blinking (1X/second)	1000Mbps Link – Activity in progress
	Off	No Link
Right LED (Amber)	Solid on	10/100Mbps Link
	Blinking (1X/second)	10/100Mbps Link – Activity in progress
	Off	No Link

Ethernet port 4 

LED	LED Status	Description
Left LED (Green)	Solid on	2.5 Gbps Link
	Blinking (1X/second)	2.5 Gbps Link – Activity in progress
	Off	No Link
Right LED (Amber)	Solid on	10/100/1000 Mbps Link
	Blinking (1X/second)	10/100/100 Mbps Link – Activity in progress
	Off	No Link

Cable port
The Cable port allows you to connect to your local coax network and the broadband network of your service provider. This port also carries the MoCA signaling.

Power inlet
The power inlet (Power) allows you to connect 12V DC Power from the power brick. Only the EPS-6 supplied with the unit may be used with this product.

USB
The USB port uses a USB-C connector and contains USB 2.0 signaling and power. The USB port is only intended to communicate with Comcast-approved products.

Bottom panel 

Product label
The label on the bottom of the Gateway contains key manufacturing information, such as the part number, serial number, CM MAC address, MTA MAC address, and WAN MAC address.

Installation Notes

Local connection requirements

Wireless connection for Wi-Fi
If you want to connect your computer using a wireless connection, your computer must be equipped with a Wi-Fi Certified wireless client adapter.

Wired connection via Ethernet
If you want to connect a computer using a wired connection, your computer must be equipped with an Ethernet Network Interface Card (NIC).

Power to the Gateway

Procedure
Proceed as follows:

1. Use the power brick that is included with your Gateway.
2. Connect the small end of the power cord to the power brick of the Gateway.
3. Plug the power brick into the electrical outlet.
4. Wait at least two minutes to allow the Gateway to complete the startup phase.

Connect your wired devices

R.equirements 

• Both your network device (for example, a computer) and the gateway must have a free Ethernet port.
• Your network device must be configured to obtain an IP address automatically. This is the default setting. Ethernet ports 1 – 3 on the Gateway are Gigabit Ethernet ports and have a maximum speed of 1 Gbps
  Gbps (Gigabit per second). Ethernet port 4 is a 2.5 Gigabit Ethernet port and has a maximum speed of 2.5 Gbps (Gigabits per second).

Procedure: Proceed as follows:

1. It is recommended to use Category 5e or Category 6 Ethernet cables with the Gateway
2. Plug one end of the Ethernet cable into one of the RJ-45 Ethernet ports on the back of the Gateway:
3. Plug the other end of the Ethernet cable into the Ethernet port of your network device.
4. Your network device is now connected to your network. Use the same procedure to connect other Ethernet devices (computers, network printers,s and so on).

Connect your Wi-Fi devices.

Introduction 
The Gateway supports three Wi-Fi bands that allow you to connect wireless devices to your network:

• The 6 GHz IEEE 802.11ax access point offers superior transfer rates, is less sensitive to interference, and allows you to connect IEEE 802.11ax wireless clients with 6GHz capability.
• The 5 GHz IEEE 802.11ax access point offers superior transfer rates, is less sensitive to interference,e and allows you to connect IEEE 802.11a/n/ac/ax wireless clients.
• The 2.4 GHz IEEE 802.11ax access point allows you to connect IEEE 802.11b/g/n/ax wireless clients. Use this access point for wireless clients that do not support 5 GHz.

If you want to connect your wireless client to the 6GHz or 5 GHz access point, make sure that your wireless client supports these connections.

Requirements 

• Your network device must be equipped with a WiFi Certified wireless client.
• Your network device must be configured to obtain an IP address automatically. This is the default setting.

Procedure 

• If you want to connect a computer using the wireless network, configure the wireless client on your computer with the wireless settings printed on the Gateway’s product label, located on the bottom of the Gateway.

How to connect your phone

Introduction

• This section describes how to connect the phones to single-line customers.
• If you have a two-line setup or a setup involving an alarm, please contact your service provider. This setup must be done by qualified technicians.

Procedure
Connect your traditional phone, external DECT base station, or fax to an active RJ-11 Telephone jack on the back panel of your Gateway.

1. Plug the other end of the telephone cable into the telephone device.
2. Alarm systems must be connected to either port 1 or 2. You are responsiblefor ensuringe that the Alarm system is connected to an active telephone port connected to the phone network.
3. You must verify that each phone line is active by first checking for dial tone, and then by placing a call to an active telephone number and checking that both parties can properly hear one another.

Cable Distribution

• For this apparatus, the cable shield/screen shall be grounded (earthed) as close as practical to the point of entry of the cable into the building.
• For products sold in the USA: This reminder is provided to call the system installer’s attention to ANSI/NFPA 70, the National Electrical Code (NEC), in particular Section 820.93, Grounding of Outer Conductive Shield of a Coaxial Cable. The cable distribution system should be grounded (earthed) by ANSI/NFPA 70, the National..
• Electrical Code (NEC), in particular Section 820,93, Grounding of outer Conductive Shield of a Coaxial Cable. Servicing
• To reduce the risk of electric shock or electrocution, do not disassemble this product.
• If service or repair work is required, take it to a qualified service dealer.

Damage requiring service: Unplug this product from the mains supply socket outlet and refer servicing to qualified service personnel under the following conditions:

• When the power supply, powercordord or its plisare damaged.
• When the attached cords are damaged or frayed.
• If liquid has been spilled into the product
• If the product has been exposed to rain or water.
• If the product does not operate normally.
• If the product has been dropped or damaged in any way.
• There are noticeable signs of overheating.
• If the product exhibits a distinct change in performance.
• If the product is giving off smoke or a burning smell.
• Protect the product when moving it.. Always disconnect the power source when moving the product or connecting or disconnecting cables. Interface classifications (upon applicability).

The external interfaces of the product are classified as follows:

• Cable (IN/OUT): TNV (Telecommunications Network Voltage) circuit, not subjected to overvoltages (TNV-1)
• Phone, FXS: TNV circuit, not subjected to overvoltages (TNV-2)
• MoCA, HPNA, RF: TNV circuit, not subjected to overvoltages (TNV-1)
• All other interface ports (e.g, Ethernet, USB), including the low-voltage power input from the AC mains power supply: SELV (Safety Extra-Low Voltage) circuits.

Regulatory information
North America – United States of America Federal Communications Commission (FCC) Compliance statement

  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.

Responsible Party – U.S. contact information
Technicolor Connected Home LLC, 5030
Sugarloaf Parkway, Building 6, Lawrenceville, GA
30044 USA, 317-587-5466.
FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to
operate this equipment.

FCC Part 15B Supplier’s Declaration of Conformity
The FCC Part 15B Supplier’s Declaration of Conformity (SDoC) for your product is available at the following internet address: www.technicolor.com/ch_regulatory.

FCC radio frequency interference statement
This equipment has been tested and found to comply with the limits for a Class B digital device under Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used according to 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 equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

RF exposure statement

• This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions to satisfy RF exposure compliance. To maintain compliance with FCC RF exposure compliance requirements, please follow the operation instructions as documented in the product documentation. When the product is equipped with a wireless interface, th becomes a mobile or fixed-mounted modular transmitter and must have a separation distance of at least 25 cm between the antenna and the body of the user or nearby persons. In practice, this means that the user or nearby persons must have a distance of at least 25 cm from the product and must not lean on the product in case it is wall-mounted.
• With a separation distance of 25 cm or more, the M(aximum) P(ermissible) E(xposure) limits are well above the potential this wireless interface is capable of producing. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

Restricted frequency bands
In case this product is equipped with a wireless transceiver operating in the 2.4 GHz band, it can only use channels 1 to 11 (2412 to 2462 MHz) on

U.S.A. territory.

• In case this product is equipped with a wireless transceiver operating in the 5 GHz band, it meets all the other requirements specified in Part 15E, Section 15.407 of the FCC Rules.
• In case this product is equipped with a wireless transceiver operating in the 6 GHz band, FCC regulations restrict the operation of this device to indoor use only.
• The operation of this device is prohibited on oil platforms, cars, trains,  boats, and aircraft, except thathe t the operation of this device is permitted in large aircraft while flying above 10,000 feet. Operation of transmitters in the 5.925-7.125 GHz band is prohibited for control of or Communications with unmanned aircraft systems.
• The availability of some specific channels and/or operational frequency bands is country dependent and is firmware programmed at the factory to match the intended destination. The firmware setting is not accessible by the end user.

Warranty Information
Unless express and prior approval by Technicolorwritingitinobtainednedg, you may not:

• Disassemble, de-compile, reverse engineer, trace or otherwise analyze the equipment, its content, operation, or functionality, or otherwise attempt to derive source code (or the underlying ideas, algorithms, structure or organization) from the equipment, or any other information provided by Technicolor, except to the extent that this restriction is expressly prohibited by local law;
• Copy, rent, loan, re-sell, sub-license, or otherwise transfer or distribute the equipment to others;
• Modify, adapt, or create a derivative work of the equipment;
• Remove from any copies of the equipment any product identification, copyright, h,t, or other notices;
• Disseminate performance information or analysis (including, without limitation, benchmarks) from any source relating to the equipment.

Such acts not expressly approved by Technicolor will result in the loss of product warranty and may invalidate the user’s authority to operate this equipby with FCC Rules.

Copyright 

• Copyright ©2021 Technicolor. All rights reserved.
• Distribution and copying of this document, use and communication of its contents are not permitted without written authorization from Technicolor. The content of this document is furnished for informational use only, may be subject to change without notice, and should not be construed as a commitment by Technicolor. Technicolor assumes no responsibility or liability for any errors or inaccuracies that may appear in this document.
• 4855 Peachtree Industrial Blvd, Suite 2,00 Norcross, GA 30092 USA

Trademarks 
The following trademarks may be used in this document

• Adobe®, the Adobe logo, Acrobat®,at®, and Adobe Reader® are trademarks or registered trademarks of Adobe Systems, Incorporated, registered in the United States and/or other countries.
• Apple® and Mac OS® are registered trademarks of Apple Computer, Incorporated, registered in the United States and other countries.
• CableLabs® and DOCSIS® are registered trademarks of CableLabs, Inc.
• DLNA® is a registered trademark, DLNA disc logo is a service mark, and DLNA Certified™ is a trademark of the Digital Living Network Alliance. Digital Living Network Alliance is a service mark of the
• Digital Living Network Alliance.
• Ethernet™ is a trademark of the Xerox Corporation.
• EuroDOCSIS™, EuroPacketCable™, and PacketCable™ are trademarks of CableLabs, Inc.
• Linux™ is a trademark of Linus Torvalds.
• Microsoft®, MS-DOS®, Windows®, Windows NT®, and Windows Vista® are either registered trademarks or trademarks of the Microsoft Corporation in the United States and/or other countries.
• UNIX® is a registered trademark of UNIX System Laboratories, Incorporated.
• UPnP™ is a certification mark of the UPnP Implementers Corporation.
• Wi-Fi Alliance®, Wi-Fi®, WMM®, and the Wi-Fi logo are registered trademarks of the Wi-Fi Alliance. Wi-Fi CERTIFIED™, Wi-Fi ZONE™, Wi-Fi Protected Access™, Wi-Fi Multimedia™, Wi-Fi
• Protected Setup™, WPA™, WPA2,™ and their respective logos are trademarks of the WiFi Alliance.

Other brands and product names may be trademarks or registered trademarks of their respective holders. All other logos, trademarks, K, S, and service marks are the property of their respective ownerwhetherere marked or not. marked

Document Information 

• Status: v1.0 (September 2021)
• Reference: XB8 CGM4981 Data Sheet COMCAST Title: Setup and User Guide XB8 CGM4981COM

FAQs

Q: Can I use a different power supply unit with the product?
A: No, only use the power supply unit provided with the product or approved replacements to ensure safety and proper functioning.

Q: Where can I find the FCC Part 15B Supplier’s Declaration of Conformity?
A: The FCC Part 15B Supplier’s Declaration of Conformity for your product is available at www.technicolor.com/ch-regulatory.

Documents / Resources

Xfinity CGM4981COM XB8 xFi Advanced Gateway Modem [pdf] User Guide CGM4981COM, CGM5981COM, CGM4981COM XB8 xFi Advanced Gateway Modem, CGM4981COM, XB8 xFi Advanced Gateway Modem, Advanced Gateway Modem, Gateway Modem

References

• User Manual