Black Box 5000 manual 262

Multiserver 5000

strapping — A hard-wire method used in the Multiserver to configure a module. For example, on the voice/fax module strappable options include KTS, OPX, and E&M telephone interfaces, and Types I through V E&M interfaces. Also strappable are the input impedance options (600, and U.K./COMP) in the international voice/fax modules.

STX, start of text — A control character used to indicate the beginning of a message.

switch group — A group of switches encased in a block mounted on a printed circuit board. It is also called a DIP switch or configuration switch group.

switching — Selective, requested interconnection of same-class ports on local and/or remote nodes. Async and voice/fax ports can be switched; sync ports cannot. Contrast with force connection.

sync — Short for “synchronous.” See synchronous transmission.

synchronous transmission — Transmission in which the data characters and bits are transmitted at a fixed rate with the transmitter and receiver synchronized. This eliminates the need for the start and stop bits that are used in asynchronous transmission.

SYN, synchronous idle — In synchronous transmission, a control character used to maintain synchronization and as a time fill in the absence of data.

tail circuit — A circuit to a network node, normally a leased line.

TD, transmitted data — An RS-232 signal where data is sent from DTE to DCE.

telephone interface — The analog side of a voice/fax channel. Compatible with KTS, OPX, or E&M type telephone interface equipment, depending upon how the voice/fax channel is strapped.

telephone interface connector — A termination on the voice/fax module that connects the analog side of the voice/fax channel to the telephone equipment such as a telephone set, key telephone system, or voice PBX. There are two types of telephone interface connectors:

•RJ-11 6-pin modular jack, used for KTS and OPX telephone interface equipment. Requires a modular cable.

•8-pin terminal block, used for KTS, OPX, and E&M telephone interface equipment. Requires a cable made up of 8 color-coded wires.

telco — An abbreviation for any telephone company.

terminal — Any device capable of sending or receiving data over a data-communications channel.

timeout — The expiration of a predefined interval which then triggers some action.

tone signaling — A configurable option in E&M- strapped voice/fax channels. When so configured, the local channel senses an idle condition of the remote channel when a 2280- Hz tone is present on the T1-R1 pair. When the local channel is in an idle state, it informs the remote channel by placing a 2280-Hz tone on the T-R pair. See also DC signaling.

2-wire/4-wire— A configuration option that matches the E&M-strapped voice/fax channel with the PBX tie trunk. In a 4-wire system, the audio signal is transmitted over one pair of wires and received over the other pair. In a 2-wire system, the same pair of wires is used for both transmit and receive.

TX, transmit — An abbreviation for transmission or transmitting.

Types I to V — Strapping options on the voice/fax module used to match the E&M-strapped channel with one of five PBX trunk types.

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