DSR provides you and your customers diversity and the ultimate in survivability at interoffice facilities, the local loop and your Verizon wire center. A DSR network easily meets even the most stringent requirements for concentrated, high-capacity data traffic. Plus, Verizon's DSR technology has built-in intelligence to detect trouble instantaneously and resolve it quickly.

Verizon DSR allows customers to interface directly with Gigabit Ethernet (GigE) signals, as well as expanding DS1 interface capabilities into higher speed rings.

With Verizon's Asymmetrical Port Facility (APF) and Subtended Node Facility (SNF) you can have more control of the network. Asymmetrical Port arrangements exist when the port speeds at the points of DSR ingress and egress are not identical. Asymmetrical port arrangements permit users to aggregate sub-rate services within DSR networks. An Asymmetrical Port Facility (APF) allows a customer to extend that aggregated DSR traffic to a location that is not part of the DSR network.

Subtended Node Facility (SNF) is similar to the APF in that it allows the customer to extend traffic to an off-ring location. The difference is that the aggregated signal that is extended can be de-multiplexed at the off-ring location.

Another feature which has also been added to DSR service is the ability to interconnect two DSR arrangements and exchange traffic between those two rings. This new capability is known as Subtending Ring service available to all DSR customers. View the Diagrams below.

DSR works in two ways. Normal Routing connects multiple locations by combining dedicated, fiber-based facilities and advanced SONET equipment. It ensures that no single points of failure occur from an end-user location to the point-of-presence.

An Alternate Route connection protects you in the event disaster strikes. Traffic reroutes at full bandwidth to keep applications running smoothly.

An Asymmetrical Port Facility is an optical facility created as a network that provides a high speed synchronous OC3, OC12, and OC48 connection from a SONET add/drop multiplexer (ADM) to the demarcation point.

A Subtending Ring allows a customer to subtend same-speed or lower speed rings off of a designated main DSR ring using common nodes. The service places nodes in a ring configuration via a common node with the use of port nodes. This allows the two rings to interconnect and therefore share traffic.

Benefits

• Verizon engineers consult with you to design the DSR network for efficient connectivity. Their recommendations are based on needed ring speed, the services delivered and node location.
• Near 100 percent survivability with no reduction in bandwidth ensures that you and your customers experience reliable network performance. Our one-minute service guarantee proves it.
• Verizon maintains surveillance on and monitors the network so that DSR is cost-effective for you -- and reliable for running your customers applications.
• DSR service efficiently transports huge volumes of data among multiple locations. That makes it easy for you to serve very large customers, no matter how demanding they are.
• DSR accommodates a wide range of interfaces, ring speeds from OC-3 to OC-192 and delivers signal rates from DS1 to Gigabit Ethernet to OC-48c. That means flexible network configurations.
• Asymmetrical Port Facility is an optical facility beneficial for carriers looking for this type hand-off.
• The Asymmetrical Port Facility arrangement is cost efficient it saves space on the MUX, minimizes power requirements, and eliminates the need for additional muxing equipment.
• An Asymmetrical Port Facility arrangement lets you aggregate subtending channels for more efficient traffic transport.
• The Subtending Ring arrangement allows efficient and economical ring interconnections. Allows creation of customized bandwidth connectivity to multiple locations. Also, provides ring or network expansion without service interruption on Main ring.

Normal Routing DSR uses a combination of dedicated fiber-based facilities and advanced SONET equipment to connect multiple locations. There are no single points of failure from an end-user location to the POP. In the event of a disaster, Alternate Routing DSR instantly re-routes traffic to provide near 100% survivability with no reduction in bandwidth.

Applications

• DSR is the perfect solution for businesses that require high-speed transport and are spread across multiple locations.
• Recommend DSR for customers whose needs include continuous Internet access, medical imaging applications, high-speed data transfers and call center or data center support.
• Suggest adding the Asymmetrical Port Facility or Subtending Node Facility arrangement for customers desiring to aggregate and transport sub-rate services within their DSR networks.
• Subtending rings supports single or dual Hub & Spoke configurations. DNCC will provide node survivalility for riders/circuits by utilizing SONET Drop and Continue technology.

SONET Ring (DSR) is a premium SONET service. Because it is a private dedicated fiber-based facilities network, we design it to meet your needs. And because it is based on cutting-edge SONET technology, it provides you the reliability, the diversity, and the ultimate in survivability at the local loop, the interoffice facilities and the wire center.

As a SONET-based service, DSR provides near 100% survivability. Intelligent network elements insure nearly instantaneous trouble detection and rapid dispatch for repairs. DSR is a flexible service that easily meets any requirement for concentrated, high capacity traffic patterns needing the highest level of survivability, spare capacity on demand as well as a high degree of facility control.

With DSR, we tailor the network to meet your specific needs. A Verizon engineer works with you to determine the best design for your network and the most efficient way to implement your system.

DSR is designed for end-user customers with high-speed data requirements. It works especially well for mission critical, multi-site environments. Banks and financial institutions, hospitals and educational facilities are among those who can benefit from this service. When you need SONET ring technology for your custom network, you can rest assured that your communications are safe with DSR.

Asymmetrical Port Facility and Subtending Node Facility arrangements are designed to direct lower speed services to the optical Stub Hub facility via a carrier facility assignment (CFA). The APF and SNF is configured as a 2-fiber 0x1, or as a 4-fiber 1+1 protected network between the ADM and the fiber termination panel at no extra charge. We simply aggregate subtending channels on an optical hand-off provided at the demarcation point. Thus, traffic is routed between the POP node of the entrance/customer ring and the customer point of interface. Your services ride a bigger pipe for efficient transport.

Subtending Rings allow DSR customers to subtend same speed or lower speed rings off of a designated main DSR ring using common nodes. This service is possible by placing nodes in a ring configuration via common nodes with the use of port nodes.

Availability

Effective as of May 31, 2007, Verizon is grandfathering the Dedicated SONET Ring (DSR) service in its FCC Tariff Nos. 1, 11, 14 and 16 (Tariffs). Last year, Verizon received forbearance from certain common carrier regulation for several packet-switched broadband services, as well as non-TDM-based optical networking, optical hubbing, and optical transmission services (Forbearance). In accordance with this Forbearance relief, Verizon will now offer a service comparable to DSR under a private carriage arrangement.

Following the grandfathering of DSR in the Tariffs, if you wish to place any new orders for DSR, you will need to enter into a private carriage arrangement with Verizon for a comparable service. Subject to certain terms and conditions, you may make certain changes to your existing DSR under the Tariffs. For a full description of all permitted changes, if any, please refer to the Tariffs.

Please note that DS1, DS3, STS1, and DS3 Transmux rate elements of the DSR are excluded from grandfathering as described herein, and such rate elements shall continue to be available to you under the Tariffs only.

Learn more about Forbearance or contact your Account Manager for details.

Verizon offers a Special Access Service Guarantee (SASG) based on the length of service interruption and states that “any service outage greater than the specified SASG interval, due solely to a telephone company facility component failure, will result in a credit of 100% of the monthly rate for the applicable rate elements of the affected service. Only one such credit is allowed in a single month’s billing period.” For Dedicated SONET Ring the SASG is one minute.

Ring Speeds

• OC3
• OC12
• OC48
• OC192

Rates Delivered

• DS1 signals
• DS3 signals
• STS1 signals
• OC3 signals
• OC3c signals
• OC12 signals
• OC12c signals
• OC48 signals
• OC48c signals
• Gigabit Ethernet (GigE) signals

Interfaces

• DS1 - DS1
• DS3 - DS3
• STS1 - STS1
• STS1 - DS1
• STS1 - DS3
• OC3 - OC3
• OC3c - OC3c
• OC12 - OC12
• OC12 - OC12
• OC48 - OC48
• OC48c - OC48c
• GigE - GigE

Survivability

• Near-100% survivability with no reduction in bandwidth Virtually 100% capacity redundancy Survivability is provided for the local loop, interoffice facilities and wire centers.

Network Guarantees

• One-Minute Service Guarantee - If service is down for one minute or more, Verizon will refund 100% of the monthly charges for the applicable rate elements of the affected service.

An Asymmetrical Port Facility (APF) or Subtended Node Facility (SNF) provides high-speed synchronous connections from a SONET Next Generation Add/Drop Multiplexer. The optical facility is created as a network between the SONET multiplexers low-speed port and the service demarcation point.

Connections

• OC3
• OC12
• OC48

Configurations: The APF or SNF is configured as a:

• 2- fiber (0x1) or 4-fiber (1+1) protection network between the NGADM and the fiber termination panel

Note: The terms and conditions of certain of the services described above are set forth in full detail on a private carriage basis (Private Carriage Services). For all Private Carriage Services, the above summary is provided for your information and reference only. However, the actual terms, conditions, restrictions, limitations and the like for Private Carriage Services will be those set forth in the agreement between the customer and Verizon for such Private Carriage Service and shall govern over any inconsistent provisions set forth herein. All services are not available in all areas, and are subject to availability of facilities and equipment.

To learn more about this service, please contact us or call your account manager today.