SONET Services

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AT&T SONET Services include optical fiber point-to-point and "self-healing" ring networks that provide you with the flexibility to quickly add network capacity as your needs increase. These services are designed with security and service continuity in mind to provide you with reliable, consistent service.

Download the AT&T Metro Data Service brochure

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Dedicated SONET Ring Service (DSRS)

Dedicated SONET Ring Service (DSRS) provides you with a customized, dedicated self-healing ring network for two or more of your premise and central office locations. The ring, with bandwidth  levels of OC3, OC12, OC48, or OC192, will support voice, video, and data via DS-1 and above interfaces. 

Ring architecture, including sub-rings, is designed to provide increased reliability and functionality. Dedicated SONET Ring Service provides Automatic Protection Switching to help ensure 100% availability of the services on the ring.

Self-healing Transport Network (STN)

Self-healing Transport Network (STN) is an optical fiber service connecting two or more access nodes by using optical fiber in a dual-ring structure. This structure helps ensure security and reduce maintenance expense by consolidating your existing transport services. STN is ideal for customers who have large volume networks and need self-healing and signal duplication capabilities. 

STN provides flexible transport of various transmission bandwidths, allowing the use of voice, data and video service on a single platform serving numerous locations. STN service includes self-healing characteristics, multiplexing, performance monitoring, and network supervision.

Benefits of STN service are:

• Highly reliable connection through physically separate fiber facilities;
  
  
• Flexibility to easily add sites and services; and
  
  
• Maximum network up-time.
  
  

Applications for STN service include:

• LAN-to-WAN interconnection;
  
  
• Consolidation of network circuitry;
  
  
• Exchange of detailed data files; and
  
  
• Connection of multiple, distributed locations.
  

ACCU-Ring^®  Service

For customers that operate in multiple locations, a high-performance ring network offers important advantages over conventional solutions. AT&T's ACCU-Ring^® provides a reliable, cost-effective solution for your data networking needs. ACCU-Ring^® is a private network backbone that uses a dedicated high-speed fiber ring to carry all of a customer's network traffic. ACCU-Ring^® service accommodates private line, switched and enhanced services to carry local and long distance voice, data, and video traffic. This simplifies access to multiple services - helping you to save time and money. 

Click here to learn more about how ACCU-Ring^®  service can help your business:

• Consolidate multiple services on a single, integrated access service
  
  
• Increase security and reliability for critical applications
  
  
• Simplify vendor relationships through a single point of contact and outsourced management.
  

Dedicated Entrance Facilities

AT&T's Dedicated Entrance Facilities (DEF) provide customers with high-bandwidth channelized data connectivity to Carrier POPS, LSOs or a designated premises (data centers, carrier hotels, branch offices, end-users, etc.)  within a metropolitan area over the AT&T Metro Network. DEF is ideal for customers who are seeking to bundle access for all applications (Data, IP, Video, Voice, etc.) onto one facility with flexible protection options.

DEF service operates over a dedicated SONET backbone on AT&T's Local Network Service (LNS) network and provides exceptional quality of service and reliability. AT&T monitors the service around-the-clock, ensuring the highest performance. The dedicated private line access allows the utmost security, making certain that no one else can use a customer's communications path. AT&T targets 99.999% reliability, made possible by a state-of-the-art, self-healing fiber optic network. In fact, the network is designed to recover from disasters such as fiber cuts or electronic component failure within 50 milliseconds.

Benefits of Dedicated Entrance Facilities are:

• Circuit Facility Assignment provides you with effective capacity management and allows you to customize facility service channel configurations;
  
  
• Cost-effective consolidation of all your access -- reduces the need for additional access circuits;  
  
  
• Bandwidth is reserved for the future growth of your business; and
  
  
• Robust protection options and flexible term options are available.

DEF is offered in flexible point-to-point SONET-based communications paths at a SONET-like pricing structure, in AT&T Local Network Service (LNS) local markets with facility bandwidths of:

• OC3  (155 Mbps)
• OC12 (622 Mbps)
• OC48  (2.5 Gbps)
• OC192 (9.9 Gbps)

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DEF is suitable for the transmission of voice, data or any other application that utilizes digital signals within the specified transmission parameters of the network, providing Service Channels of:

• DS1      (1.544 Mbps)
• DS3      (44.736 Mbps)
• OC3c     (155 Mbps)
• OC12c   (622 Mbps)
• OC48C   (2.5 Gps)
• STM-1   (155 Mbps)
• STM-4   (622 Mbps)

Protect Your Network

Once a customer customizes its network to support applications critical to its business, robust protection options are available.

Standard Protection Options:

1. High Speed Optical Interfaces
2. Redundant Power at AT&T Local Network Node
3. Protected Low Speed Electrical Interface (DSx speeds)
4. Diverse Routed Fibers

Premium Protection Options: 

1. Dual Entrance Cables at Customer Premises
2. Dual Power Sources at Customer Premises
3. 1+1 Protected Optical Interface to Customer (OCx speeds)
4. Offers industry leading Network Availability SLAs

See DEF Node Options for more information.

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DEF Benefits are:

• Effective Capacity Management - Allowing customers to customize facility service channel configurations via Circuit Facility Assignment (CFA) control
• Flexible Connectivity Options - Via service channels to IXCs, ASPs, Carrier Hotels, Data Centers or other premise locations and services within a metro space
• Cost-Effective Consolidation of Access - Reducing the need for additional access circuits  
• Reserved bandwidth - Customized and flexible bandwidth configuration for the anticipated future growth of customer business 
• Security and Service Continuity - SONET network survivability, redundancy options and diverse routes ensures business continuity

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• Ethernet

Whether you need high-speed access to serve small branch offices or high capacity for mission-critical data centers, or end-to-end connectivity from 512 Kbps to 10 Gbps, AT&T has a cost-effective Ethernet solution for you.

• Frame Relay & ATM Services-Domestic

AT&T's Frame Relay and ATM Services enable highly reliable, high-speed transmission of voice, data, video and multimedia applications over a single network by supporting rapidly changing bandwidth demands through ReliaBURST®. IPeFR/ATM addresses the growing importance of IP-based networking and the increasingly distributed communications needs of businesses, while providing the service and security level expected of Frame Relay and ATM.

• Local Private Line Point-to-Point Services

AT&T Local Private Line (LPL) provides IntraLATA point-to-point digital data connectivity, offering a cost-effective solution for connecting multiple sites to each other or to network nodes with a fully-managed, high-speed service.

• Wavelength

Wavelength products are cost-effective solutions for networking in metropolitan areas.

• AT&T Commercial DSL Loop Products

AT&T Commercial DSL Loop Products

These products provide high-speed access for multiple data, voice and video services. These services are available in most geographic areas in the continental United States.