GR-3127-CORE (New GR) - Generic Criteria for DSL Bonding DSLAMs

Introduction

DSL "Bonding," is the process of splitting a single bit stream into multiple bit streams for transport over multiple DSL lines, and then reassembling it into the original bit stream at the receiver. Bonding may cost-effectively allow Local Exchange Carriers (LECs) to achieve aggregate line rates necessary to deliver multichannel IP video service to a widely base of customers over copper by selectively bonding two pairs of ADSL2+ or VDSL on the longer lines in a serving area. Bonding multiple G.shdsl lines can also allow very-high speed symmetric business services such as 10 Mbps native Ethernet.

Three types of bonding standards were recently sent to ANSI publication by ATIS, and also consented by the ITU-T:

• ATIS T1.PP.427.01-2004, and ITU-T G.998.1 "ATM-Based Multi-Pair Bonding"
• ITU-T G.998.2 "Ethernet-Based Multi-Pair bonding"
• ATIS T1.PP.427.03-2004, and ITU-T G.998.3 "Multi-Pair Bonding Using Time-Division Inverse Multiplexing"

Project Scope

The above standards only specify the network interface. This GR is expected to build on these standards with more complete equipment specifications. Emphasis is expected to be on ATM-based bonding, with Ethernet and TDIM included depending on interest and commonality. This work will be synergistic with Telcordia FITL requirements including GR-909-CORE.

The issues to be addressed in the new GR will be decided by the industry participants, but are anticipated to include:

• Equipment requirements such as which combinations of ports/cards/shelves on a DSLAM may be bonded (e.g., fixed vs. user defined port bonding), what speeds should be carried, etc. This may include specifying architectures that use a common piece of bonding equipment to bond ports on different DSLAMs.
• Specifications unique to remote deployments of bonded DSL lines, which may include powering and environmental requirements unique to a deployment from a remote terminal or an SAI crossbox.
• Specifications unique to ADSL2+ and VDSL delivering video over bonded DSL lines. For video, QoS requirements such as packet jitter, delay, and packet loss may be expanded beyond those in the bonding standards.
• Bonded G.shdsl for Native Ethernet transport, possibly specifying methods of bonding Ethernet traffic over the ATM bonding interface, in addition to the native Ethernet bonding interface. Specifications may be written for making the bonded DSL line transparent to the Ethernet user, so that the user sees only a native 10/100 Mbps Ethernet connection.
• Bonding-specific impacts on the DSLAM to service access gateway (i.e., the BRAS) interface may be considered.

Pursuant to the Telecommunication Act of 1996, relating to the development of industry-wide generic requirements, Telcordia invites all interested members of the industry to participate in the potential development of this proposed new GR. If your company is interested in participating in this activity, please contact Telcordia.

For More Information

Ken Kerpez
Telcordia Technologies, Inc,
One Telcordia Drive, Piscataway,
Room RRC 1N327,
Piscataway, NJ 08854-4182
Phone: (732) 699-2234

Tentative Schedule

Contact by: May 31, 2005
Project Start Date: June 2005
Estimated Completion Date: December 2005

Participation Fee: $25,000 for early sign-up, $28,000 otherwise