RiderB - Frame Relay and Asynchronous Transfer Mode Data Services
Service Identifier: Frame Relay and Asynchronous Transfer Mode Data Services                                                       View Rates/Pricing 

Description of the Service:

Frame Relay and Asynchronous Transfer Mode (ATM) are high speed, wide area, data transfer services which allows for the transfer of variable length frames, or fixed length cells across a wide geographical area. These services are generally intended for data applications that are characterized by bursts of traffic across a wide geographical area, such as Local Area Network (LAN) connectivity. Fixed bandwidth connections are also supported under the ATM service option. Access speeds of 56 Kbps to 148 Mbps are supported.

Service Architecture:

Frame Relay and ATM services are provided by an integrated architecture that provides common switching and transport for both. Under this architecture, the appropriate frame relay or ATM access options are selected, and the integrated network provides connectivity between any combination of access. The common switching and transport is based on ATM switching and SONET transport at speeds of 155 Mbps (OC3) and 45 Mbps (DS3). Frame relay traffic is generally converted to ATM cells at the ingress or egress switch so that it can be sent over the network. This is a very efficient and flexible architecture, since common transport is not segregated by the type of access service provided. An integrated architecture also provides for integrated network management across frame relay and ATM services.

The switch platform used in the network provides CPU, memory, power and fabric redundancy via an active and standby mode configuration. Line cards are generally not redundant; however, standby cards are available for immediate use if the need arises. SONET-based interoffice facilities used in the network provide fiber and terminal redundancy in a point-to-point or ring topology. The local loop may not be redundant, depending on the type of access facility. Alternate routing of frame relay Permanent Virtual Circuits (PVCs) and ATM Virtual Channel Connections (VCCs) is performed by the network switches in the event of a transport failure within the network. Alternate routing of ATM Virtual Path Connections (VPCs) within the ATM network is available.

Availability and Limitations:

DS0 and DS1 Frame Relay Services are available throughout the State. DS3 is available in offices connected with DS3 or OC3 capable inter-office fiber. A current list of offices in Pacific Bell territory is available in the DS3/OC3 Availability Table. DS3 and OC3c facilities have limited availability and must be verified via the AVO process.

Due to the constant addition of fiber facilities, and increasing demand for fiber-based services, an inquiry as to firm availability is required prior to order.

The ability to deliver Frame Relay or ATM service to a specific location is dependent upon the completion of a facility check.

For services in other territories, an inquiry will determine availability.

Unless noted separately in Rider C, Frame Relay and Asynchronous Transfer Mode Data Services include the following elements: planning, applicable design, engineering, testing, termination, installation and training, where applicable. Frame Relay and Asynchronous Transfer Mode Ports include interoffice transport if applicable.

Frame Relay Services

Frame Relay Service is a statistically multiplexed data service that allows for the transfer of variable length frame across a wide geographical area. Users access the service via a digital connection, or local loop, to a frame relay port. The user port is also referred to as User-Network-Interface (UNI). This service uses a connection oriented Permanent Virtual Circuit (PVC) to establish a connection between two Data Link Connection Identifiers (DLCIs) on two different frame relay ports. A single access line can have many PVCs that can connect to other frame relay access ports.

The following local loop and port combinations are available:

  • 56 Kbps local loop (DS0) to a 56 Kbps port, serving up to 50 PVCs
  • 1.544 Mbps local loop (DS1) to a 1.536 Mbps port, serving up to 250 PVCs
  • 45 Mbps local loop (DS3) to a 44.21 Mbps port, serving up to 976 PVCs

For each PVC, the State user will specify the Committed Information Rate (CIR) when ordering the service. CIR is specified in 4 Kbps increments, from 0 to the speed of the lowest speed port that the PVC terminates on. For example, if the PVC terminates on a DS0 and a DS1 port, 56 Kbps will be the maximum CIR setting. Frames sent by the user at a rate above the CIR will have the Discard Eligible (DE) bit in the frame relay protocol header set to a value of "one". Frames sent by the user at the CIR or below will not have the DE bit changed by the network.

In the event of unusual network congestion conditions, frames with the DE bit set to "one" are discarded first. If congestion conditions continue, other frames may be discarded. The network is designed and operated so that no frames will be discarded under normal network conditions.

The user can send bursts of data on the PVC up to the speed of the lowest speed port that the PVC is connected to. For example, a PVC that terminates on a DS0 and a DS1 port can accept data bursts up to 56 Kbps.

Oversubscription of 200% is allowed on a UNI port. That is, the sum of the CIR values of all the PVCs on a UNI port can be as much as twice the rate of the port.

In addition to the above, Multilink Frame Relay bonds together multiple T1's to provide a Frame Relay port option between T1 and DS3. Two to eight T1's can be bonded together to provide bandwidth options of 3 Mbps, 4.5 Mbps, 6 Mbps or 12 Mbps.

The following local loop and port combinations are available:

Local Loop Frame Relay Port
2 X 1.544 Mbps 3.0 Mbps
3 X 1.544 Mbps 4.5 Mbps
4 X 1.544 Mbps 6.0 Mbps
8 X 1.544 Mbps 12.0 Mbps

Multilink Frame Relay (MLFR) provide Inverse Multiplexing Frame Relay packets over multiple physical links aggregated together into a single "bundle" of bandwidth from 2 up to 8 DS1s.

MLFR provide 3 to 12Mbps of speed using standard DS1 lines. These features fill the gap for bandwidth between DS1 and DS3 over existing copper infrastructures.

If the State user requests an inter-LATA PVC connection, MCI will provide the transport needed between the LATAs. See Data Services, Extended Frame Relay and Extended ATM Services Rider B's.

Frame Relay Features

Feature Name

USOCS(s)

Feature Description

Feature Limitations

DS0 Class of Service

FRAME, FRAME5

56 Kbps class of service

 

DS0 Port Termination

FR56K, FC56K

UNI port at 56 Kbps (DS0 facility - ADN)

One port per access facility.

Requires ADN (see Data Services, Dedicated Services Rider B).

DS1 Class of Service

FRAME1, FRAME5

1.536 Mbps class of service

 

DS1 Port Termination

FR154, FC154

UNI port at 1.536 Mbps (DS1 facility - HiCap)

One port per access facility.

Requires T1 Subscriber Access Line (see Data Services, Dedicated Services Rider B).

DS3 Class of Service

FRAME2, FRAME5

DS3 class of service

 

DS3 Port Termination

FR37M, FC37M

UNI port at 44.21 Mbps (DS3 facility)

One port per access facility.

Requires DS3 Subscriber Access Line (see Data Services, Dedicated Services Rider B).

Data Link Connection (1st port)

RELAY, RELAC

DLCI, indicates frame address

At least one per port, quantity limits above

Data Link Connection (each additional)

RELAY, RELAC

   

Expedite Option

 

Provisioning is 5 business days. See Service Level Agreements, Installation Intervals Table.

 

InterLATA Frame Relay

 

See Data Services, InterLATA Frame Relay and ATM Services Rider B.

 

The following features are for Multilink UNI Port Only:

Feature Name

Bandwidth

Speed

Feature Limitations

MLFR 3.0 Mbps Port 2 DS1s Port 3.0 Mbps Requires 2 x 1.544 Mbps local loop
MLFR 4.5 Mbps Port 3 DS1s Port 4.5 Mbps Requires 3 x 1.544 Mbps local loop
MLFR 6.0 Mbps Port 4 DS1s Port 6.0 Mbps Requires 4 x 1.544 Mbps local loop
MLFR 12.0 Mbps Port 8 DS1s Port 12.0 Mbps Requires 8 x 1.544 Mbps local loop

Frame Relay Internet Access

Through the Pacific Bell subsidiary of Pacific Bell Internet (PBI), State frame relay users can obtain Internet Access with the addition of a Private Virtual Circuit (PVC) from the State user's port to the nearest PBI router. The additional PVC, and inter-LATA CIR charges, if any, are obtained from the above section. PBI will provide an Internet connection to a PVC terminating on a PBI router at a CIR of 56 Kbps, 128 Kbps, 384 Kbps or 1.536 Mbps. PBI Internet Services include IP level transport, Primary and Secondary Domain Name Service, Internet Domain Name Registration, IP address assignment, and e-mail spooling.

Service includes IBM Global Network Services as the selected Global Service provider. PBI provides service only within a service area. Service provided across service area boundaries are provided by Global Service Providers.

Feature Name

USOCS(s)

Feature Description

Feature Limitations

Frame Relay

Internet DS1

NT15E

Internet access

Via 1536 Mbps CIR PVC

Requires

transport service (see above)

Frame Relay Internet 384

NT84E

Internet access via 384 Kbps CIR PVC

Requires

transport service (see above).

Frame Relay Internet 128

NT28E

Internet access via 128 Kbps CIR PVC

Requires

transport service (see above).

Frame Relay Internet DS0

NT56E

Internet access via 56 Kbps CIR PVC

Requires

transport service (see above).

ATM Services

Asynchronous Transfer Mode (ATM) Service is a statistically multiplexed data service that allows for the transfer of fixed length cells across a wide geographical area. Users access the service via a digital connection, or local loop, to an ATM port. The local loop connections to the ATM switch are not subject to mileage charges. The user port is also referred to as a User-Network-Interface (UNI). This service uses a connection oriented Virtual Channel Connection (VCC) or Virtual Path Connection (VPC) to establish a connection between two different ATM ports. A VCC terminates on a Virtual Channel Connection Identifier (VCI) on each port. A VPC terminates on a Virtual Path Connection Identifier (VPI) on each port. A single access line can have many VCCs and/or VPCs that can connect to other ATM access ports.

The following local loop and port combinations are available:

Local Loop

ATM Port

1.544 Mbps

 

45 Mbps

0 to 20 Mbps

45 Mbps

21 to 40 Mbps

155 Mbps

0 to 50 Mbps

155 Mbps

51 to 100 Mbps

155 Mbps

101 to 148 Mbps

In addition to the above, Inverse Multiplexing for ATM (IMA) bonds together multiple T1’s to provide an ATM port option between T1 and DS3. Two to eight T1’s can be bonded together to provide bandwidth options of 3 Mbps, 4.5 Mbps, 6 Mbps or 12 Mbps.

The following local loop and port combinations are available:

Local Loop

ATM Port

1.544 Mbps

3.0 Mbps

1.544 Mbps

4.5 Mbps

1.544 Mbps

6.0 Mbps

1.544 Mbps

12.0 Mbps

ATM Cell Relay Service supports three classes of service (COS). One class is associated with Constant Bit Rate (CBR) traffic primarily for voice and video applications and the other is associated with Variable Bit Rate (VBR) traffic primarily for data applications. Unspecified Bit Rate (UBR) is also offered for bursty traffic which is suited to take advantage of times when other applications are underutilizing their bandwidth. There is no minimum bandwidth guarantee for UBR connections per definition of the service. However, the network is engineered to carry an amount of traffic that will satisfy the needs of UBR users.

The sum of the PVC’s throughput speed (PCR) cannot exceed the maximum transmission capacity of the access facility.

A PVC must be either CBR, VBR or UBR at both ends (i.e., CBR to CBR, VBR to VBR or UBR to URB).

CBR and VBR quality-of-service (QoS) attributes are defined by the following parameters: Cell Loss Ratio (CLR), Cell Transfer Delay (CTD) and Cell Delay Variation (CDV), as shown in the following table. UBR traffic is a "best effort" primarily for bursty data applications with oversubscription requirements. As with frame relay, the network is designed so that no UBR cells are lost under normal network operating conditions.

Cell Loss Ratio (CLR) is the ratio of the number of cells lost (i.e., not delivered to their destination egress) to the total number of incoming cells (lost + delivered).

Cell Transfer Delay (CTD) is the elapsed time from the time the first bit of a cell enters the network at the ingress UNI to the time when the last bit of the cell leaves the network at the egress UNI.

Cell Delay Variation (CDV) is a random variable that reflects the impact that contention between connections for cell slots at multiplexers and switches as well as other inherent ATM processes (such as Idle Cell insertion) has on the interarrival time between consecutive cells, which may affect the service performance of time sensitive traffic (CBR traffic). Cell Delay Variation is also known as cell jitter.

QoS Parameters

QoS for CBR Traffic

QoS for VBR Traffic

CLR

<10-9

< 10-7

CTD 99th percentile

2 msec + [2 msec per 100 geographic miles]

Not specified

CDV 10-9 quantile

< 1 msec for OC3c

< 2 msec for DS3

< 16 msec for DS1

Not specified

The above performance descriptions are generic to ATM service. For specific performance commitments, see the appropriate Rider B – Service Level Agreement tables.

If the State user requests an interLATA VCC or VPC connection, MCI will provide the transport needed between the LATAs.

ATM Features

Feature Name

USOCS(s)

Feature Description

Feature Limitations

DS1 ATM Port

MT

Per mega bit port information access rate

Requires DS1 Subscriber

Access Line (see Data Services, Dedicated Services Rider B).

DS3 ATM Port

MT73U

Per mega bit port information access rate

16 Mbps or 40 Mbps port speed only.

Requires DS3 Subscriber

Access Line (see Data Services, Dedicated Services Rider B).

UNI T1 – 3.0 megabit IMA

AUT35

3.0 Mbps Bandwidth

Includes one port and one local access only.

UNI T1 – 4.5

Megabit IMA

AUT45

4.5 Mbps Bandwidth

Includes one port and one local access only.

UNI T1 – 6.0 megabit IMA

AUT65

6.0 Mbps Bandwidth

Includes one port and one local access only.

UNI T1 – 12.0 megabit IMA

AUT75

12.0 Mbps Bandwidth

Includes one port and one local access only.

OC3c ATM Port

MT7CU

Per mega bit port information access rate

51 Mbps or 148 Mbps port speed only. Requires OC3 (see Data Services, SONET Rider B).

Virtual Channel Connection (1st per port)

CVC

Address for Virtual Channel Connection

 

Virtual Channel Connection (each additional per port)

CVC

Address for Virtual Channel Connection

 

Virtual Path Connection (1st per port)

CVP

Address for Virtual Path Connection

 

Virtual Path Connection (each additional per port)

CVP

Address for Virtual Path Connection

 

Constant Bit Rate (per Mbps)

CACBR

Specifies CBR connection

 

Variable Bit Rate

CAVBR

Specifies VBR connection

Required to have Maximum Burst Size

Unspecified Bit Rate

FAMS+

Specifies UBR connection

 

Maximum Burst Size

CAMS1

32 cell burst

 

Maximum Burst Size - to 100 cells

CAMS2

100 cell burst

 

Maximum Burst Size - to 200 cells

CAMS3

200 cell burst

 

DS1 Circuit Emulation Service (CES)

CEST1

DS1 Circuit Emulation is an enhancement to ATM Cell Relay Service that provides the capability of directly connecting

time division multiplexing (TDM) interfaces onto the ATM network. Each DS1 CES corresponds to a single CBR VCC. CES DS1 Service provides transparent "clear channel" transmission of

a DS1 data stream across the ATM Network. Voice applications for DS1 CES are Primary Rate ISDN (PRI) and Supertrunk.

Requires ATM Cell Relay Service.

Requires Virtual Channel Connection (VCC) and Constant Bit Rate (CBR) which are used across each DS1 Circuit Emulated PVC.

Requires DS3 or OC3 transport (see Data Services, Rider B).

DS1 Circuit Emulation for PRI

CESPR

DS1 Circuit Emulation for Primary Rate ISDN (PRI) is a Tracking USOC designed to provide identification of PRI ISDN associated with Circuit Emulation.

Requires Circuit Emulation Service (CES).

Requires Primary Rate ISDN (PRI)

(See Data Services Rider B)

DS1 Circuit Emulation for Supertrunk

CESTK

DS1 Circuit Emulation for Supertrunk is a Tracking USOC designed to provide identification of Supertrunk associated with Circuit Emulation.

Requires Circuit Emulation Service (CES).

Requires Supertrunk

(See Lineside Services Rider B)

Expedite Option

 

Provisioning is 5 business days. See Service Level Agreements, Installation Intervals Table.

 

InterLATA ATM (Mid-Link Service)

 

See Data Services, Extended ATM Rider B.

 

Other Options:

Feature Name

USOCS(s)

Feature Description

Feature Limitations

Frame Relay and ATM Network Interworking

 

Network interworking is transparent to users of the Frame Relay service, but is needed to transport frames over the ATM/SONET backbone. Service interworking allows State users to have a network combining both Frame Relay and ATM Services.

The network provides an InterWorking Function (IWF) to provide the necessary protocol conversion.

Frame Relay Forum Implementation

Agreement, FRF.5 describes Frame Relay network interworking. Network Interworking is used to transport Frame Relay packets across an intermediate ATM network to another frame relay network. With network interworking, the frame relay header is encapsulated into the ATM cell payload.

For FR-FR connections, the use of the ATM network is fully transparent to the end user. Interworking functions provide the mapping and encapsulation functions

that are necessary to

ensure that the frame relay service is unchanged by the presence of an ATM transport.

The FR-SSCS (Frame Relay Service Specific Convergence Sublayer) is used for FR-to-ATM network interworking. The FR-SSCS is located in the upper part of the ATM Adaptation Layer on top of the CPSC (Common Part Convergence Sublayer) of AAL type 5. The format of the FR-SSCS-PDU structure is exactly the same as the Q.922 frame relay frame, but without the flags, zero bit insertion or FCS (Frame Check Sequence).

Frame Relay and ATM Service Interworking

 

Service interworking is

used to translate frame relay packets into ATM cells for transmission across an ATM network to ATM-attached devices. Service interworking is used when interconnecting FR-to-ATM connections through network.

The network provides translation protocol mapping and transparent protocol mapping; the choice of mapping is configurable. Translation protocol mapping determines the protocol type, and remaps the frame relay protocol to the ATM protocol and vice versa. With Transparent protocol mapping, the network does not determine the protocol type; it only removes the frame relay header and transfers the payload transparently between the frame relay and ATM networks.

At the frame relay User Network Interface (UNI), the network provides service interworking between frame relay and ATM in accordance with the multiprotocol interconnection standards defined by IETF FRC 1483 and IETF FRC 1490, and in accordance with the internetworking agreement in FRF.8 FRFTC/94-026R3 of the Frame Relay Forum.

Frame Relay and Asynchronous Transfer Mode Management Services

The integrated architecture providing Frame Relay and ATM Services provides three network management options for various levels of State users:

Customer Network Management (CNM) X-terminal, Customer Network Management (CNM) SNMP, and Customer Network Management (CNM) Web V.2 Service.

Service

Service Description

Limitations or Compatibility Restrictions

Customer Network Management (CNM) X-terminal

CNM X-terminal (X-term) provides the most comprehensive set of management capabilities, including:

  • Real-time network map display
  • Alarm log files
  • Real-time performance monitoring and graphing
  • Historical performance
  • and traffic reports
  • UNI information
  • Connection Endpoint
  • Customer defined labels
  • Customer privacy protected

Frame Relay and ATM

Private frame relay PVC access only. CNM X-term requires that the State user provide a Windows 95, Windows NT, or Solaris workstation with X-Windows software. The workstation must also be connected to the Frame Relay Network.

Customer Network Management (CNM) SNMP Service (inc. one Internet Protocol address)

Customer Network Management (CNM) Simple Network Management Protocol (SNMP) Service provides a management view of the State user's Frame Relay network. The service provides real-time data reflecting frame relay network events. Database access via SNMP Management Information Base is also provided for retrieving configuration data. Since it is based on SNMP, it allows integration with most SNMP management application programs.

Frame Relay

The State user must subscribe to Frame Relay Service in order to use CNM SNMP. The State user must obtain all necessary Customer Premise Equipment to access and use the Service, including, but not limited to, equipment, Frame Relay service, and application software necessary to receive network event information access the database to query and receive configuration information.

For turn-key SNMP Network Monitoring System, see Other Services, Network Management Rider B.

CNM SNMP Monitoring (Per Virtual Circuit Monitored)

   

CNM SNMP - each additional IP address

   

Customer Network Management (CNM) Web V.2 Service (inc. one secure password)

Customer Network Management (CNM) Web V.2 Service provides a secure World-Wide-Web site that the State user can access to obtain performance and configuration information on the Frame Relay Service. This is intended for State users that need to

periodically review network performance and configuration. The information is updated weekly.

The State user must obtain all necessary Customer Premises Equipment to access and use the service, including, but not limited to, equipment and service to access the World Wide Web, and a web browser supporting the Secure Sockets Layer security protocol.

CNM Web V.2 - each additional password

   

Performance Commitments: Frame Relay and ATM Service meets the requirements detailed in Table A, Data Services.

Rights and Remedies: The rights and remedies for Frame Relay and ATM Service are detailed in Table A, Data Services.

           
Revised:  Amendment No.19