Glossary - S

S

Sentry I, II, III Wire Maintenance Plan

Maintenance Plans (which include Sentry I, II and III) provide business and residence customers with a telephone maintenance plan.

Server

A networked computer that stores information and makes it available upon request to client programs that may be located on other computers. "Client-server" computing is the basis of virtually all local area networks and the World Wide Web.

Service Access Code (SAC)

A Service Access Code is also known as a Numbering Plan Area (NPA). There are two general categories of NPAs:

• Geographic NPA--Associated with a defined geographic area; all telephone numbers bearing such an NPA are associated with services provided within that geographic area.
• Non-Geographic NPA--Associated with a specialized telecommunications service, which may be provided across multiple geographic NPA areas; for example 800, 900, 700, 500 and 888. Also known as an area code.

Service Provider (SP)

A company that provides telecommunications services. Includes Verizon, along with other Incumbent Local Exchange Carriers (ILECs), along with Competitive Local Exchange Carriers (CLECs), Long Distance Carriers and Commercial Mobile Radio Service (CMRS) Providers.

Serving Wire Center

The first local exchange carrier wire center to which facilities are connected on the terminating path of a call proceeding from the customer premises to the terminating end office.

Shielded Twisted Pair (STP)

Two-pair wire medium used in the transmission of several different protocols. STP is capable of supporting CDDI for link distances of up to 100 meters. These wires have a layer of shielded insulation.

Signal-to-Noise Ratio (S/N Ratio)

The ratio of the signal power to the noise power at a point in a system (usually expressed in decibels).

Signaling

The transmission of address and other switching information between end users and central offices, and between central offices.

Signaling Point (SP)

A node in the CCS network that originates and/or receives signaling messages, or transfers signaling messages from one signaling link to another, or both.

Signaling Point of Interconnection (SPOI)

The Interexchange Carrier-designated location, in the same LATA as the local service provider Signaling Transfer Point, where SS7 signaling information is exchanged between the telephone company and the Interexchange Carriers.

Signaling Point of Interface

The customer-designated location, in the same LATA as the local service provider Signaling Transfer Point, where SS7 signaling information is exchanged between the provider and the customer.

Signaling Repeater Loop

Line quality enhancement equipment that detects and regenerates signaling states.

Signaling System 7 (SS7)

A digital data network carrying signaling information that interfaces with the telephone company voice/data network for services using the American National Standards Institute (ANSI) Common Channel Signaling (CCS7) protocol. Also known as CCS/SS7.

Signaling System 7 Network

A digital data network carrying signaling information that interfaces with the telephone company voice/data network for services using the American National Standards Institute (ANSI) Common Channel Signaling (CCS7) protocol.

Signaling Transfer Point (STP)

A specialized switch that provides SS7 network access and performs SS7 message routing, screening and transfer of signaling message through the common channel signaling network.

Simple Options

Verizon's long distance plan for high-volume calling for businesses. Learn more.

Singing Return Loss (SRL)

The frequency-weighted measure of return loss at the edges of the voice band (SRL Low, 260 to 500 Hz and SRL High, 2200

Single Sign On

A mechanism by which a user is authenticated and authorized for access to a variety of applications.

"Slamming"

Changing an end user's primary local exchange carrier or Interexchange Carrier without the end user's authorization. Slamming is unlawful.

SNA

See Systems Network Architecture.

SONET (Synchronous Optical Network)

1. An optical interface standard that allows different digital signals to be transported using a base transmission rate of 51.84 megabits per second OC-1 (Optical Carrier) STS-1 (Synchronous Transport Signal). Higher rates are direct multiples of the basic OC-1 building block.
2. A Private Line service offered through Verizon that uses industry standard interfaces for implementing a robust, survivable transport technology.

Special Access Service

A transmission path directly connecting an Interexchange Carrier location in a LATA to an end user premise or another Interexchange Carrier location.

Specialized Mobile Radio System (SMRS)

A private radio system providing land mobile communications service to eligible persons on a commercial basis.

Spectrum

The range of electromagnetic radio frequencies used in the transmission of voice, data and television.

Speed Dialing 8

Lets a caller assign a one-digit code between two and nine for the eight most frequently dialed numbers. Phone numbers that are up to 28 digits long can be stored- a handy feature when using access codes for long distance, calling card and international calls in addition to the call recipient's area code and phone number. Learn more.

Speed Dialing 30

Lets a caller assign a one-digit code between two and nine for the thirty most frequently dialed numbers. Phone numbers that are up to 28 digits long can be stored- a handy feature when using access codes for long distance, calling card and international calls in addition to the call recipient's area code and phone number. Learn more.

SSO

See Single Sign On.

SS7 Interconnection and Transport

A Verizon Partner Solutions service that offers Inter-exchange providers the ability to interconnect to Verizon's Signaling System 7 Network at one or more signal transfer points.

Statement of Generally Available Terms and Conditions (SGAT)

File Q statement of the generally available terms and conditions for interconnection with an ILEC's network in the absence of a negotiated agreement.

Strapping

The act of installing a permanent connection between a Point of Termination (POT) Bay and a collocated party's physical collocation node.

Subscriber Line Charge (SLC)

A monthly fee paid by a telephone subscriber to the local exchange carrier for part of the cost of installation and maintenance of the telephone wire, poles, and other facilities that link a residence to the telephone network. The SLC is one component of access charges.

Subscription

Permits an end-user customer served from a Equal Access office to automatically route, without the use of an access code, the customer's local toll and long distance communications to an Interexchange Carrier of the customer's choice. The customer may also gain access to an alternate Interexchange Carrier by using the appropriate carrier access code; for example, 1010XXX.

Summary Account

A method of consolidating the monthly charges on multiple BTNs and/or SBNs. A summary account bill includes all related sub-account bills, with the charges totaled for payment at the summary account level. Also called a Summary Bill Account.

Summary Bill Account

A method of consolidating the monthly charges on multiple billing telephone numbers and/or sub-billing telephone numbers. A summary account bill includes all related sub-account bills, with the charges totaled for payment at the summary account level. Also called a Summary Account.

Superframe Format (SF)

The structure consisting of 12 DS1 frames (2316 bits) that utilizes the framing bit of twelve consecutive frames to provide terminal framing and signaling framing. The DS1 has 193 bit positions.

Switch

A device that can be controlled to interconnect two circuits.

In the context of Frame or LAN switching, this refers to a device that filters, forwards and floods frames based on the frame destination address. The switch learns the addresses associated with each switch port and builds tables based on this information to be used for the switching decision. Some switches are high speed implementations of bridges where switching decisions are made by computer chips, usually an Application Specific Integrated Circuit (ASIC).

Switched Access Service

Switched Access Service provides for a two-way communications path capable of transmitting both voice and data services between an Interexchange Carrier location and the premises of its end-user customers. It includes access services that use the local exchange carrier's central office switches.

Switched Line

One of a series of lines that can be interconnected through a switching center; a line on the Public Switched Telephone Network. Contrasts with leased line.

Switched Multimegabit Data Service (SMDS)

A broadband communications standard for the Public Switched Telephone Network.

Switched Services

All dial-up telecommunications services including conventional residential services and Wide Area Telecommunications Services (WATS).

Switched Virtual Circuits (SVC)

A virtual link, with variable end-points, established through an ATM network. With a SVC, when the call is initiated, the user defines the end-points that are subsequently terminated at the end of the call. With a Private Virtual Circuit (PVC), the end-points are predefined by the network manager. A single virtual path may support multiple SVCs.

Synchronous

A form of communications where characters or bits are sent in a continuous stream, with the beginning of one signal continuous with the end of the preceding one; separation of one from the other requires the receiver to maintain a synchronization to a master timing signal.

Synchronous Optical Network (SONET)

An optical interface standard that allows different digital signals to be transported using a base transmission rate of 51.84 megabits per second OC-1 (Optical Carrier) / STS-1 (Synchronous Transport Signal. Higher rates are direct multiples of the basic OC-1 building block.

Synchronous Transport Signal - Level 1 (STS-1)

The basic SONET logical building block signal. STS-1 provides a total bandwidth of 51.84 megabits per second, including both overhead and payload. An STS-1 is capable of transporting a single DS3 in any configuration (for example, M13 formatted with multiplexed DS1s or clear channel 44.736 megabits per second) or up to the equivalent of 28 DS1s using SONET "VT" mappings. The interface to an STS-1 is a metallic-based electrical interface. Also:

• STS3--ATM Physical Layer implementation supporting 155 Mbps.
• STS-3c--Synchronous Transport Signal level 3, concatenated.

Systems Network Architecture (SNA)

A widely used network architecture.

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