WorldCom Proprietary & Confidential Page 1

MAE® Services

Tom BechlyFebruary 11, 2002NANOG 24 IX Panel

WorldCom Proprietary & Confidential Page 2

L2 Encapsulation Overhead• Comparison of Framed payload – independent of

transmission media

Encapsulation Fixed IP Payload64 bytes

IP payload

1500 bytes

Bytes % %

Ethernet w/o 802.1q 18 78.0 98.8

Ethernet w 802.1q 22 74.4 98.6

RFC2427(routed,SNAP header)

12 84.2 99.2

RFC2427(routed,NLPID protocol)

6 91.4 99.6

RFC2684 (ATM AAL5 SNAP)

12 60.4 88.4

WorldCom Proprietary & Confidential Page 3

Frame Interface

• Efficient utilization of bandwidth• CPE POS Router Ports are economic and

dense• Service provisioning is straightforward for

both Customer and MAE facility• No routing information exchanged between

MAE facility and CPE• MAE services technology can change while

preserving stable service level interface• Colo-Neutral architecture (i.e., WAN protocol)

WorldCom Proprietary & Confidential Page 4

MAE® FE Service•POS interface with frame relay encapsulation

–PVCs based on Juniper ccc technology–“Best Effort” service, No policing or shaping–Supports ANSI Annex D LMI–DLCIs from 512 to 1007

•Access speeds are OC3, OC12, and OC48•Customers provision PVCs via PeerMakerSM Provisioner

•Sites have colocation and transport•MAE ChicagoSM FE Service Facility 10/01•MAE New YorkSM FE Service Facility 3/02

WorldCom Proprietary & Confidential Page 5

Frame/ATM Interworking

InterworkingSwitch

BorderRouter

BorderRouter

ATMSwitch

ATM

ATMFrame Relay

WorldCom Proprietary & Confidential Page 6

Planned Service Enhancements

• Frame/ATM Interworking– Deploy Frame Relay interworking switch at

existing MAE ATM facilities– ATM PVCs can be mapped to Frame PVCs– OC3, OC12, and OC48 Frame access to

exchange– Interworked PVCs provisioned via

PeerMakerSM Provisioner– Planned for mid 2002