The industry-leading GRSTM 3-piece trunk and distribution connector series is designed for optimal performance in high-bandwidth, two-way, and digital communication systems. The GRS provides independent seizing of the cable’s center conductor and outer conductors during the installation process, guaranteeing proper cable retention.
A sequence of bits sent by a device transmitting data so that the device receiving the data can synchronize its clock, which dictates the intervals at which individual bits are expected to be sent and received.
Store and Forward
Technique for examining incoming packets on an Ethernet switch or bridge whereby the whole packet is read before forwarding or filtering takes place. Store and forward is a slightly slower process than cut-through, but it does insure that all bad or misaligned packets are eliminated from the network by the switching device.
Characteristics of particular geographical areas such as ice build-up, wind speed and ambient temperature, that affect the design of aerial cable installations. [Arr11] STP
STP System Test Plan Streaking
A term used to describe a picture condition in which objects appear to be extended horizontally beyond their normal boundaries.
Stream Control Transmission Protocol (SCTP)
IETF protocol that supports reliable data exchange between two endpoints.
Digital Video, Audio, and Data Services that are selectively delivered to individual users, either in response to a user request or based upon a user profile. These services are delivered over a data transport stream, either via real-time transmission to the user, or via off-peak data-carousel transmission to a storage device at or near the user's location for subsequent retrieval.
Steel, aramid yarns, fiberglass epoxy rods or other material used to increase the tensile strength of a cable. [Arr11] Strip Amplifier
An active device that amplifies and stabilizes an RF input signal. [Arr11]. Typically employed when only a defined frequency band requires amplification, control, and/or shaping. An example of this type of amplifier is the Blonder Tongue Laboratories FM Strip Amplifier model number ZSCA-FM. The ZSCA is designed to amplify and stabilize the level of a single or multiple FM channel in a MATV or SMATV headend. This strip amplifier offers low noise, high output capability, and a wide AGC window, thereby providing a very stable, low distortion signal.
Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators Sub
Subscriber; a cable customer.
The frequency band from 6 MHz to 54 MHz, which may be used for two-way data transmission. Also known as sub-VHF channels, television channels usually between 5.75 and 47.75 MHz or at frequencies lower than channel 2. [Arr11]
A second signal "piggybacked" onto a main signal to carry additional information. In satellite television transmission, the video picture is transmitted over the main carrier. The corresponding audio is sent via an FM subcarrier. Some satellite transponders carry as many as four special audio or data subcarriers whose signals may or may not be related to the main programming.
A unidirectional flow of IP packets characterized by a single source and destination IP address and single source and destination UDP/TCP port.
A subdivision of a layer in the Open System Interconnection (OSI) reference model.
Subnetworks are formed by connecting adjacent nodes physically with transmission links. Subnetwork Access Protocol (SNAP)
An extension of the LLC header to accommodate the use of 802-type networks as Internet Protocol (IP) networks.
The unique spot over the earth's equator assigned to each geostationary satellite. [Sat07] Subscriber
A household or business that legally receives and pays for cable and/or pay television service for its own use. Alternate definition is: The entity that is the subject of, and has been issued, a Certificate. The Subscriber is capable of using, and is authorized to use, the private key that corresponds to the public key listed in the Certificate. Also, the telephone or CATV customer.
A monthly fee paid by telephone subscribers that is used to compensate the local telephone company for part of the cost of installation and maintenance of the telephone wire, poles and other facilities that link your home to the telephone network. These wires, poles and other facilities are referred to as the "local loop." The SLC is one component of access charges. [Tim11] Subscriber Loop
The part of the telephone network that runs from the Central Office to individual subscribers. [Tim11] Subscriber Media Gateway (SMG)
A media gateway located within the subscriber's network which “bridges” calls between the Internet Protocol (IP) network and the subscribers' telephones (or telephony-type devices). Typically such a media gateway provides an external interface to one or more 2500-type telephony handsets and also supports common standard add-on devices such as caller-id display units and message-waiting lights.
The fixed, typically wall-mounted equipment used by the subscriber in a wireless local-loop system to send and receive messages; a standard telephone is attached to it by wire to complete the connection to the user.
Subscription Television (STV)
A special service providing additional programs in encoded form to television viewers who pay a monthly rate. [Tim11] Subsidiary Communications Services
A subcarrier of television and FM stations providing a second audio programming source. [Tim11] Subsplit
A frequency-division scheme that allows bi-directional traffic on a single cable. Reverse path signals come to the headend from 5 to 30 (up to 42 on extended subsplit systems) MHz. Forward path signals go from the headend from 50 or 54 MHz to the upper frequency limit of the cable network. An example of a subsplit HFC network frequency plan is shown below: