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Telecom Dictionary - Definitions of terms

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Z

Z - Z is an abbreviation for Zulu time. See Coordinated Universal Time. - Time scale based on the second (SI), as defined and recommended by the CCIR, and maintained by the Bureau International des Poids et Mesures (BIPM). For most practical purposes associated with the Radio Regulations, UTC is equivalent to mean solar time at the prime meridian (0° longitude), formerly expressed in GMT. Note 1: The maintenance by BIPM includes coordinating inputs from time standards belonging to various national laboratories around the world, which inputs are averaged to create the international time standard (second). Note 2: The full definition of UTC is contained in CCIR Recommendation 460-4. Note 3: The second was formerly defined in terms of astronomical phenomena. When this practice was abandoned in order to take advantage of atomic resonance phenomena (" atomic time ") to define the second more precisely, it became necessary to make occasional adjustments in the "atomic" time scale to coordinate it with the workaday mean solar time scale, UT-1, which is based on the somewhat irregular rotation of the Earth. Rotational irregularities usually result in a net decrease in the Earth's average rotational velocity, and ensuing lags of UT-1 with respect to UTC. Note 4: Adjustments to the atomic, i.e., UTC, time scale consist of an occasional addition or deletion of one full second, which is called a leap second. Twice yearly, during the last minute of the day of June 30 and December 31, Universal Time, adjustments may be made to ensure that the accumulated difference between UTC and UT-1 will not exceed 0.9 s before the next scheduled adjustment. Historically, adjustments, when necessary, have usually consisted of adding an extra second to the UTC time scale in order to allow the rotation of the Earth to "catch up." Therefore, the last minute of the UTC time scale, on the day when an adjustment is made, will have 61 seconds. Synonyms World Time, Z Time, Zulu Time.

ZBTSI (zero-byte time slot interchange) - A technique applied to a DS1 frame to ensure pulse density requirements are met, where bits 2 through 193 of each frame are scrambled to minimize the occurrence of all-zero octets. When an all-zero octet is contiguous to another octet with zeros and they would combine to violate the ones density requirement, an algorithm is invoked where some all-zero octets are replaced by an address chain. The reverse algorithms are performed by the receiving terminal.

Zero-bit Insertion - A bit-stuffing technique used with bit-oriented protocols to ensure that six consecutive "1" bits never appear between the two flags that define the beginning and the ending of a transmission frame. Note: When five consecutive "1" bits occur in any part of the frame other than the beginning and ending flag, the sending station inserts an extra "0" bit. When the receiving station detects five "1" bits followed by a "0" bit, it removes the extra "0" bit, thereby restoring the bit stream to its original value. Synonyms zero insertion, zero stuffing.

Zero dBm Transmission Level Point (0 dBm TLP) - In a communication system, a point at which the reference level is 1 mW, i.e., 0 dBm. Note: The actual power level of the communications traffic is not necessarily 0 dBm. It is usually below the reference level. The reference is for system design and test purposes. Synonym zero transmission level point.

Zero-Dispersion Slope - In a single-mode optical fiber, the rate of change of dispersion, with respect to wavelength, at the fiber's zero-dispersion wavelength. Note 1: In silica-based optical fibers, the zero-dispersion wavelength occurs at approximately 1.3 m, but this wavelength may be shifted toward the minimum-loss window by the addition of dopants to the fiber material during manufacture. Note 2: Doubly and quadruply clad single-mode fibers have two zero-dispersion points, and thus two zero-dispersion slopes.

Zero-Dispersion Wavelength = 1. In a single-mode optical fiber, the wavelength or wavelengths at which material dispersion and waveguide dispersion cancel one another. Note: In all silica-based optical fibers, minimum material dispersion occurs naturally at a wavelength of approximately 1.3 m. Single-mode fibers may be made of silica-based glasses containing dopants that shift the material-dispersion wavelength, and thus, the zero-dispersion wavelength, toward the minimum-loss window at approximately 1.55 m. The engineering tradeoff is a slight increase in the minimum attenuation coefficient. 2. Loosely, in a multimode optical fiber, the wavelength at which material dispersion is minimum, i.e., essentially zero. Synonym minimum-dispersion wavelength.

Aero Dispersion Window - Synonym minimum-dispersion window.

Zerofill - To fill unused storage locations in an information system (IS) with the representation of the character denoting "0".

Zero Insertion - See zero-bit insertion. A bit-stuffing technique used with bit-oriented protocols to ensure that six consecutive "1" bits never appear between the two flags that define the beginning and the ending of a transmission frame. Note: When five consecutive "1" bits occur in any part of the frame other than the beginning and ending flag, the sending station inserts an extra "0" bit. When the receiving station detects five "1" bits followed by a "0" bit, it removes the extra "0" bit, thereby restoring the bit stream to its original value.

Zeroize - To remove or eliminate the key from a crypto-equipment or fill device.

Zeroized - Electronically stored data that have been degaussed, erased, or overwritten.

Zero-Level Decoder - A decoder that yields an analog level of 0 dBm at its output when the input is the digital milliwatt signal. Note: The signal is a 1-kHz sine wave.

0 + (7 or 10 digits) = A feature of the North American Numbering Plan that identifies customer dialed calls that are operator assisted, either by electronic or manual (human) means.

Zero Stuffing - See zero-bit insertion. A bit-stuffing technique used with bit-oriented protocols to ensure that six consecutive "1" bits never appear between the two flags that define the beginning and the ending of a transmission frame. Note: When five consecutive "1" bits occur in any part of the frame other than the beginning and ending flag, the sending station inserts an extra "0" bit. When the receiving station detects five "1" bits followed by a "0" bit, it removes the extra "0" bit, thereby restoring the bit stream to its original value.

Zero Suppression - The elimination of nonsignificant zeros from a numeral.

ZTLP - Abbreviation for zero transmission level point.

Zero Transmission Level P oint (0TLP) - Synonym zero dBm transmission level point. - In a communication system, a point at which the reference level is 1 mW, i.e., 0 dBm. Note: The actual power level of the communications traffic is not necessarily 0 dBm. It is usually below the reference level. The reference is for system design and test purposes. Synonym zero transmission level point.

zip cordZip-cord - In optical communications, a two-fiber cable consisting essentially of two single-fiber cables having their jackets conjoined by a strip of jacket material. Note 1: This name is borrowed from electrical terminology referring to lamp cord. As with lamp cord, optical zip-cord may be easily furcated by slitting or tearing the two jackets apart, permitting the installation of optical connectors. Note 2: Zip-cord cables include both loose-buffer and tight-buffer designs.

Zone - See communications zone, Fresnel zone, skip zone.

Zone of Influence - The area surrounding a power station that is raised in potential above a remote or true grounding (earthing) point.

Zone of Protection - The space, adjacent to a lightning protection system, that is substantially immune to direct lightning strokes.

Zone of Silence - Synonym skip zone.

Zooming- The act of changing the scale of a display, generally without changing the amount of screen space it occupies.

Z Time - Abbreviation for Zulu Time. See Coordinated Universal Time.

Zulu Time (Z) - Synonym Coordinated Universal Time. Formerly a synonym for Greenwich Mean Time.




Fax Switch Products

 
The Stick
 

Business quality Single Line Automatic Call Processor. Perfect line sharing device for your small or home business. Automatically routes calls to the right device every time! Use up to three telecommunication devices plus an answering machine on one single phone line.This is our most popular fax switch. Click here to find out more.

Your Price only $139.00 Delivered*


The Stick II
 

Two-line Voice/Fax/Modem/Data call processor. If you use two lines in your home or business, this two-line automatic phone fax switch is what you are looking for. The only two-line Automatic Call Processor that actually turns your existing inside phone wires into a mini-network. Never worry about busy signals or missed faxes when on the Internet again. Click here to find out more.
Unique Features include:
• Call In/Dial Out Long Distance Saver
(call into it from your cell phone to make cheaper long distance calls)
• Port-to-Port Communication and Data Transfer

(works like a network over your existing phone lines.)

  Your Price only $459.00 Delivered*



SR Series - Selective Ringing Call Processors
 

The Selective Ring call processor for distinctive ringing service. Only ring the device intended for that call. Just call its phone number and it rings. Instead of having one phone number for 2 or 3 devices, you have 2 or 3 phone numbers and only pay for one phone line.

Each device has its own phone number. Works great with phone company call forwarding (forward your voice calls to your cell phone) and TDD devices too. Have a dedicated fax number, dedicated voice number and/or dedicated modem number (or a personal number) sharing your single line.

Choose from 2 or 3 distinctive ring phone numbers but pay for only one phone line plus "distinctive ring" for up to two additional numbers.
.
Click here to find out more about the SR-Series.


SR-2 (Two Devices - Two Phone Numbers)
Your Price only $139.00 Delivered*

SR-3 (Three Devices - Two or Three Phone Numbers)
Your Price only $149.00 Delivered*



Versa-Link - Industrial Grade Call Processors
 

Offering three models that, in addition to functionality similar to The Stick (voice/fax/modem call processor), dtmf and cng tone recognition, DIP switch programmability, phone line surge protection, remote diagnostics and an internal busy signal. Highest quality automatic call processor on the market today! Ultimate in reliability and dependability.

ATX-250 (Two Devices) In addition to tone detection, the ATX-250 Automatic Call Processor can process selective ring detection. For heavy duty applications.
Click here to find out more about the ATX-250.

Your Price only $196.00 Delivered*

ATX-300 (Three Devices) 3 device (plus an answering machine) Automatic Call Processor designed for ultimate reliability. Industry leader for almost 20 years.
Click here to find out more about the Ultra-Reliable Versa-Link.
Your Price only $299.00 Delivered*

ATX-300/6 (Six Devices) - 6 device Automatic Call Processor for multiple devices. Typically used when polling multiple modems.
Click here to find out more about the Ultra-Reliable Versa-Link.

Your Price only $479.00 Delivered*


Polnet
® ACP 3,5,9

 

An Industrial Grade Automatic Call Processor eliminates dedicated phone lines by expanding the number of devices you can connect to a single line. Use the Polnet for modems, data and credit card terminals, storage and monitor systems, and more! This Modem Sharing Device has special polling features and interfaces with an rj-31x jack used for larger phone systems. Able to poll multiple devices (modems) in a single call. Typically used in multiple location (store) applications. Inquire about our RAD (Remote Access Dialer) for use with multiple location polling applications with this product. Click here to find out more about Polnet..

ACP-3 (Three Devices)
Your Price only $249.00 Delivered*

ACP-5 (Five Devices)
Your Price only $309.00 Delivered*

ACP-9 (Nine Devices)
Your Price only $599.00 Delivered*


Line Hunter

 

Rack Mounted 4/12 Automatic Distinctive Ringing Processor Processor eliminates dedicated phone lines by expanding the number of devices to twelve on up to 4 phone lines. Either have up to 12 unique phone numbers on 4 lines using your local phone companies distinctive ringing service or up to 1-4 incoming phone numbers on 1-4 lines with up to 12 outgoing devices without ordering distinctive ringing. You get up to 3 incoming phone numbers on each phone line and it hunts for an open line on outgoing calls so you never get a busy signal.

Use the Line Hunter for private phone numbers, business numbers, personal numbers, modems, data and credit card terminals, storage and monitor systems, and more!
Click here to find out more about LineHunter

Line Hunter (Up to 12 phone numbers on up to 4 phone lines)
Your Price only $669.00 Delivered*


Power Controller Products

The Power Stone® - Phone controlled and secure power on/off switch for your computer.
 

A call-activated AC power controller. Reboot and power up/down off-site computers and other devices by phone.
Power up/down your computer from any phone in the world.
Click here to find out more about The Power Stone.

Your Price only $129.00 Delivered*


The Internet Power Stone® - Internet controlled and secure power on/off switch for your computer.
 

The IPS provides various methods of initiating an AC power reset to meet any requirement for complete in and out-of-band network control. By Telephone: The basic reboot function involves an incoming POTS line and a connected AC device.  By Heartbeat: The IPS can work with heartbeat software that will automatically reboot a computer when a problem occurs. By Web-browser: The IPS can be controlled by a master control unit that is accessible via the internet.
Click here to find out more about The Internet Power Stone.

Your Price only $199.00 Delivered*


The Internet Control Module® - Internet Controller for Internet Power Stone (above).
 

The ICM is a web based network manager used to control any of Multi-Link’s power control base units.The ICM connects to a web-based network like any other IP network device and acts like a mini-website, accessible via any web browser.  Base units for reset or AC power control can be located as far as 2,000ft away from the ICM network power manager.
Click here to find out more about Internet Control Module.

Your Price only $259.00 Delivered*

*Note: All prices include shipping and handling in the continental US and most of Canada. We reserve the right to charge up to the actual price of shipping on all orders outside the continental United States. Customer is responsible for any taxes, duties or brokerage charges that may apply. All orders shipped UPS Ground unless specified. For air and express shipments, appropriate charges will be applied to your order.


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Click here if you want to share 2 devices on 1 line and don't know which device to choose.


Click here if you want to share 3 or more devices on one line and don't know what type to choose.

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