STATE OF ILLINOIS ILLINOIS COMMERCE COMMISSION

Illinois Bell TelephoneCompany, AT&T Communicationsof Illinois, Inc., i CoreComm Illinois, Inc., Covad CommunicationsCompany, i MCI WorldCorn Communications,Inc., McLeodUSA TelecomnnmicationsServices, Inc., ; NEXTLINK Illinois, Inc., NorthPoint Communications,Inc., i Rhythms Netconnections and Rhythms Links, Inc., ) 21 st Century Telecom of Illinois, Inc., U&man Communications,Inc., and i Sprint CommunicationsCompany L.P. d/b/a Sprint CommunicationsL.P. ;

Joint Submissionof the AmendedPlan of Record ; for Operations Support Systems(“OSS”) 1

APPEARANCE

I hereby enter my appearanceas attorney for Rhythms Links, Inc. in the above captioned proceeding.

Dated: September6,2QOO

LI/‘- ,.I’’ Ro~~land&Moore 55 East koe Suite 3230 Chicago, Illinois 60603 (312) 803-1000 (312) 803-0953 (FAX) STATE OF ILLINOIS ILLINOIS COMMERCE COMMISSION

Illinois Bell Telephone Company, AT&T Communicationsof Illinois, Inc., CoreComm Illinois, Inc., t Covad CommunicationsCompany, MCI WorldCorn Communications,Inc., i McLeodUSA TelecommunicationsServices, Inc., ) NEXTLINK Illinois, Inc., No. 00-0592 NorthPoint Communications,Inc., i Rhythms Netconnectionsand Rhythms Links, Inc., ) 21st Century Telecom of Illinois, Inc., U&man Communications,Inc., and t Sprint CommunicationsCompany L.P. d/b/a Sprint CommunicationsL.P. ;

Joint Submissionof the AmendedPlan of Record t for Operations Support Systems(“OSS”) :,

NOTICE OF FILING

PLEASE NOTE THAT, on this date, I have filed the foregoing Notice of Appearancefor Rhythms Links, Inc. with the Illinois CommerceCommission.

Dated: September6, 2000

55 East Monroe Suite 3230 Chicago, Illinois 60603 (312) 803-1000 (3 12) 803-0593 (FAX) CERTIFICATE OF SERVICE

I HEREBY CERTIFY that a copy of the foregoing has been servedupon the parties listed in the attached service list on September6,2000, by U.S. Mail.

&2&G&2& i’-~~~

55 East Monroe, Suite 3230 Chicago, Illinois 60603 (312) 803-1000 (312) 803-0593 (FAX) Service List Terry Larkin Docket No. 00-0592 Illinois Bell Telephone Company 555 E. Cook Street, Fl. 1E Springfiel& IL 62721

Janice A. Dale Robert Koch, Sam McCLerreq Public Utilities Bureau Telecommonications Division, 100 W. Randolph Street, 12th Floor Illinois Commerce Commission Chicago, IL 6060 1 527 East Capitol Avqme P.O. Box 19280 SpringfielQ IL 62794-9280

Krlsten smootSmoot Judith D. Argentieri 21st Centory TelecomT&corn Group, Inc. AT&T Communications of Illinois, Inc. 350 North Orleans 913 S. Sixth Street, 3” Floor Suite 600 Springfield, IL 62721 Chicago, IL 60654-0989

Richard C. Balough Carol Pomponio Citizens Utility Board NextLink Illinois Three First National Plaza, Ste. 3700 810 Jorie Boulevard Chicago, IL 60602 suite 200 Oakbroo~ IL 60523-2216

Nancy Atkinson Dennis K. Muncy, Joseph D. Murphy Matt C. Deering Illinois Commerce Commission Meyer, Capel, Hirschfeld, Muncy, et al. 200 Randolph 306 West Church Street Chicago IL 60601-3104 P.O. Box 6750 Champaign, IL 618266750

David Chorzempa Darrell Town&y AT&T Communications of IL, IncInc. MCI Telecommunications Corporation 227 W. Monroe, Suite 1500 205 North Michigan Ave. Chicago, IL 60606 suite 3700 Chicago, IL 60601

Carrie J. Bightman David R. Coon SchilTHardin & Waite McLeod USA Telecommunications Services, Inc 6600 Sears Tower McLeod USA Technology Park Chicago, IL 60606 6400 C Street SW P.O. Box 3177 Cedar Rapids, Iowa 52406-3 177 Jack Pace Calvin Man&i0 City of Chicago Mamhio & Wallace 30 N. LaSalle Street 4753 N. Broadway Ave. Suite 900 Suite 732 Chicago, IL 60602 Chicago, IL 60640

Timothy Sznewajs Terry Monroe Illinois Commerce Commission Competitive Telecommnnications &sn. 160 N. LaSalle Street, Suite C-800 1900 M St., NW: Ste. 800 Chicago, IL 60601-3104 Washington D.C. 20036

Eve Moran Nora Naughton Hearing Examiner Of&e of General Counsel Illinois Commerce Commission Illinois Commerce Commission 160 N. LaSalle St., Suite C-800 160 N. LaSalle Street, C-800 Chicago, IL 60601-3104 Chicago, IL 60601

Michael Pabii Andrew 0. Isar Ameritech Services, Inc. ASCENT 225 West Randolph Street, Fl. 13 4319 92”d Avenue, I$W. Chicago, IL 60606 Gig Harbor, WA98335

Nancy Wells Kenneth Schifwm AT&T Sprint Communications 913 S. 6* St., Fl. 3 8140 Ward Parkway, 5E Springfield, IL 62703 Kansas City, MO 64114

Mike ward Felicia Francn-Fit&erg 1608 Barclay Blvd. Cwad Communications Buffalo Grove, IL 60089 8700 W. Bryn Mawr Suite 800 South Chicago, Illinois 6063 1

Craig Brown Thomas O’Brien Rhythms Links, Inc. corecomm 9100 East Mineral Circle 450 West Wilson Bridge Road Englewocd, Colorado 80 112 suite 100 Worthington, Ohio 43085