Companies (RBOCs)

Bell Operating Companies (Primary

Regional Bell Operating Companies

States of Operation), Pre-divestiture

(Headquarters), Post-divestiture

Illinois Bell (Illinois)

Ameritech (Illinois). Acquired by SBC Communications

(October, 1999); now AT&T.

Indiana Bell (Indiana)

Michigan Bell (Michigan)

Ohio Bell (Ohio)

Wisconsin Telephone (Wisconsin)

Bell of Pennsylvania (Pennsylvania)

Bell Atlantic (Pennsylvania); now Verizon Communications.

Diamond State Telephone (Delaware)

The Chesapeake and Potomac Companies

(District of Columbia, Maryland, Virginia,

and West Virginia)

New Jersey Bell (New Jersey)

South Central Bell (Alabama, Kentucky,

BellSouth (Georgia). Acquired by AT&T (January 2007).

Louisiana, Mississippi, and Tennessee)

Southern Bell (Florida, Georgia, North

Carolina, and South Carolina)

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• stored program control (SPC)
• store locator service
• STP
• streaming mode service
• stream-oriented
• strength
• strength member
• strength member
• strength member
• string
• string coding
• Strowger, Almon B.
• Strowger switch
• structured wiring plan
• STS
• stuff bit
• stuttered dial tone
• subcarrier
• submarine cable
• subnet mask
• subnet (subnetwork)
• subnetting
• subnetwork (subnet)
• subrate
• Subrate Digital Loop (SRDL)