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Comcast Business Ethernet services overview

Updated 9/15/2017 4:07:41 PM by Comcast Expert
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Introduction

Thank you for selecting Comcast Business for your communication needs. As those needs grow, please consider any of the other highly-reliable, scalable and secure Ethernet services described below. Since you’re already a valued Business Ethernet customer, your next service can be activated quickly and economically. Please contact your account executive to discuss how your organization can take full advantage of Business Ethernet services or visit business.comcast.com/enterprise/services.

Looking for more specific information? Please read Find answers to common questions regarding Business Ethernet services.

Ethernet service overview

Ethernet Private Line Service (Point to Point)

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Meet the demand of bandwidth-intensive applications and enable the use of any VLAN or Ethernet control protocol across the service with scalable, secure point-to-point configurations delivering high-capacity fiber connections between two sites.

Ethernet Virtual Private Line Service (Point to Multipoint)

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Ethernet Virtual Private Line provides a point-to-point connection that replaces frame relay or ATM services and supports a Service Multiplexed UNI, allowing for a single physical connection to customer premise equipment for multiple virtual connections.

Ethernet Network Service (Multipoint to Multipoint)

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Perfect for organizations with multiple locations and high data traffic. Comcast’s Ethernet Network service allows you to connect all remote locations to each other across a Metropolitan Area Network.

Note: Ethernet Network Services with coax access are not available in all areas.

Ethernet Dedicated Internet Service

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For enterprises that need the most bandwidth and the fastest connection providing a continuous link between their existing LAN and the public Internet, there is no better way to connect than Ethernet Dedicated Internet service.

To learn more about these services and to view technical descriptions and details, please visit business.comcast.com/enterprise/services or speak with your account representative for a custom consultation.

 

Ethernet configuration recommendations

Please review the following common configurations to optimize performance. Comcast Business Ethernet supports IPv6, available on request.

Traffic Shaping and Prioritization

Your equipment should be configured to shape traffic to the Committed Information Rate (CIR) of the circuit. For example, if your Comcast Business Ethernet service includes a 50 Mbps circuit, the traffic shaping should be configured as 50 Mbps. Without traffic shaping, Transmission Control Protocol (TCP) performance can be severely degraded.

  • Your equipment should properly classify traffic according to its delay-sensitivity so it can be prioritized in the event of a burst or sustained congestion on your circuit.

  • If your Comcast Business Ethernet service of Ethernet Private Line (EPL) and Ethernet Network Service (ENS) includes multi-priority circuits from a single UNI port, each CoS traffic within that UNI is treated as a complete separate circuit (i.e., each CoS traffic is subject to its own CIR etc). In addition, the traffic must be tagged at layer 2 to receive proper treatment in the Comcast network, with VLAN ID in the range of 1-4094, and VLAN 802.1p according to the following table:

CoS                                802.1p

Premium

5

Priority

2-3

Basic

0-1

Transmission Control Protocol

To ensure TCP is set at optimal parameters allowing Internet-driven applications to work as expected, TCP window size must account for Bandwidth Delay of Product (BDP).

 
Physical Interface Type (UNI)

 
Negotiation Setting

Speed Configuration Setting

Duplex Configuration Setting

 
Interface Type

 
100Base-T Copper

 
Auto-Negotiation

 
Auto-Negotiation

Auto-Negotiation (Full Duplex)

 
RJ45

10/100/1000Base-T
(Tri-Rate Copper)

 
Auto-Negotiation

 
Auto-Negotiation

Auto-Negotiation (Full Duplex)

 
RJ45

1000Base-X (Gigabit Ethernet Fiber Transceiver)

 
No-Negotiation

 
1000Mbps

 
Full Duplex

 
LC-UPC

10GBase-X (Ten Gigabit Ethernet Fiber Transceiver)

 
No-Negotiation

 
10000Mbps

 
Full Duplex

 
LC-UPC

 

 
Ethernet/Internet Service Types

 
Access Type

Layer 2 Framing Size (MTU)

Internet - Ethernet Dedicated Internet (EDI)

Fiber Optic

1522

Internet - Ethernet Dedicated Internet (EDI)

Coaxial

1518

Ethernet Transport - Ethernet Private Line (EPL); Ethernet Virtual Private Line (EVPL); Ethernet Network Service (ENS)

 
Fiber Optic

 
1600**

Ethernet Transport - Ethernet Private Line (EPL); Ethernet Virtual Private Line (EVPL); Ethernet Network Service (ENS)

 
Coaxial

 
1518

 

 
Ethernet/Internet Service Types

Customer Port Settings

Ethernet Frame Formatting

 
Internet - Ethernet Dedicated Internet (EDI)

 
Access Port

Un-Tagged Standard Frame

 
Ethernet Virtual Private Line (EVPL)

 
Trunking Port

IEEE 802.1Q
Tagged Frame

Ethernet Transport - Ethernet Private Line (EPL) ); Ethernet Network Service (ENS)

 
Access Port

Un-Tagged Standard Frame

 

These are Comcast standard settings. For additional details, or if you are concerned about equipment compatibility issues, please contact Enterprise Customer Care at 1-800-741-4141.

Note: Alternate Jumbo MTU Frame sizes may be available on certain products and services. Please contact your local sales team for additional information. Settings and configuration are subject to change without notice.

Additional considerations

  • Ethernet Virtual Private Line (EVPL) customers must have VLAN tagging enabled on their equipment to comply with the IEEE 802.1Q tagging standard.

  • Ethernet Network Service (ENS) has a maximum of 2500 MAC addresses/unique network connected devices across all sites in an ENS domain.

  • Customers who use their own IP allocations or advertise Comcast-allocated space via Border Gateway Protocol (BGP) for their Comcast Ethernet Dedicated Internet will experience a delay of up to 72 hours for correct routing to occur from the time allocation is added to the Internet Routing Registry.

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