ADTRAN 4200659L7, 4175043L2, 1200287L1, 1200291L1, 1200657L2, 4200659L2, 4200659L5, 4200659L8, 4200659L3, 4200659L1, 4200659L6, 4200659L4 User Manual

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Appendix C. Acronyms/Abbreviations

FEBE...............

far end block error

HSSI ................

high-speedserial interface

IP .....................

internet protocol

KA ...................

keep alive

LAIS................

loop side alarm indication signal

LAN.................

local area network

LCV.................

line coding violation

LED .................

light emitting diode

LES..................

line errored seconds

LIU ..................

line interface unit

LL....................

local loopback

LOF .................

loss of framing

LOS .................

loss of signal

MBE ................

M-biterrors

Mbps................

megabits per second

MIB .................

management information base

ms ....................

millisecond

NC....................

normally closed

NI.....................

network interface

NMS ................

network management system

NO ...................

normally open

NRZ.................

non-returnto zero

NSA .................

non service affecting

OCU ................

office channel unit

OOF.................

out of frame

OOS.................

out of service

PCV .................

P-bitcoding violation

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Appendix C. Acronyms/Abbreviations

PES..................

P-biterrored seconds

POP.................

point of presence

PPP..................

point-to-pointprotocol

PRF .................

performance

PSES ...............

P-bitseverely errored seconds

PSTN...............

public switched telephone network

PVC.................

permanent virtual circuit

RD ...................

receive data

RDL ................

remote digital loopback

RL ...................

remote loopback

RMA ...............

return material authorization

RS....................

request to send

RTS .................

request to send

Rx....................

receive

SA....................

service affecting

SEFS ...............

severely errored framing seconds

SES..................

severely errored seconds

SLIP ................

serial line internet protocol

SNMP..............

simple network management protocol

SONET ...........

synchronous optical network

SR....................

data set ready

SW56...............

switched 56

sync .................

synchronous

TA....................

terminal equipment available

TD ...................

transmit data

TDM................

time division multiplexing

TM ..................

test mode

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Appendix C. Acronyms/Abbreviations

TR....................

data terminal ready

Tx.....................

transmit

UAS .................

unavailable seconds

WAN ................

wide area network

XCV.................

excessive coding violations

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Appendix C. Acronyms/Abbreviations

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Appendix D Glossary

10BaseT

Ethernet connector which implements the IEEE standard on 24-gauge,unshieldedtwisted-pairwiring.

AMI

Alternate mark inversion. A bipolar line-codingformat in T1 transmission systems whereby successive ones are alternately inverted.

ANSI

American National Standards Institute. A non-profitorganization that coordinates voluntary standards activities in the United States.

asynchronous

A method of data transmission which allows characters to be sent at irregular intervals by preceding each character with a start bit, followed by a stop bit.

bandwidth

The bandwidth determines the rate at which information can be sent through a channel (the greater the bandwidth, the more information that can be sent in a given amount of time).

baud rate

A measure of transmission speed over an analog phone line. Baud rate measures the shortest signaling elements per second in the analog signal that a modem sends over an analog phone line. Does not necessarily equal the bit rate.

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Appendix D. Glossary

BERT

Bit error rate test. A test that uses any of a number of stress patterns to test T3, T1, FT1, and DDS circuits.

bipolar

A signal containing both positive and negative amplitude components.

bipolar violation

See BPV.

bit

A binary digit representing a signal, wave, or state as either a one or a zero. A bit is the smallest unit of information a computer can process.

bit error

The receipt of an encoded bit that differs from what was sent by the transmitter.

bit rate

The speed at which bits are transmitted, usually expressed in bits per second (bps).

bps

Bits per second. The number of bits passing a specific point per second. Examples of common rates are kbps (one thousand bits per second) and Mbps (one million bits per second). T3 operates at 44.736 Mbps.

BPV

Bipolar violation. A violation in the alternate mark inversion (AMI) line code for which consecutive 1s are represented by pulses of opposite polarity. BPVs that are not intentional (B8ZS) are counted as errors. Could also be the presence of two consecutive 1 bits of the same polarity on the T-carrierline.

bridge

A data communications device that connects two or more networks and forwards packets between them.

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Appendix D. Glossary

byte

Generally, an 8-bitquantity of information. This term is used mainly in referring to parallel data transfer, semiconductor capacity, and data storage.

carrier

The provider of the telecommunication services to the customer site. Carriers can be local telephone companies, regional telephone companies, or any interexchange carrier such as AT&T, Sprint, or MCI.

C-bit

An overhead bit in the DS3 string not used for framing, parity, or alarm indication.

CCITT

Consultive Committee for International Telephony and Telegraphy. A standards organization that devises and proposes recommendations for international communications. See also ANSI.

CD

Carrier detect. A signal generated by a modem or DSU/CSU indicating the presence of a carrier signal on a communications link.

channel

A transmission path between two or more termination points; also called a circuit, facility, line, link, or path.

channel bank

Equipment in a telephone central office or customer premises that performs multiplexing of lower speed digital channels into a higher speed composite channel. The channel bank also detects and transmits signaling information for each channel, thereby transmitting framing information so that time slots allocated to each channel can be identified by the receiver.

channel service unit

See CSU.

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Appendix D. Glossary

clocking

An oscillator-generatedsignal that provides a timing reference for a transmission link. A clock provides signals used in a transmission system to control the timing of certain functions. The clock has two functions: (1) to generate periodic signals for synchronization, and (2) to provide a time base.

CPE

Customer premises equipment. All telecommunications terminal equipment located on the customer premises, including telephone sets, private branch exchanges (PBXs), data terminals, and customer-owned, coin-operatedtelephones.

craft port

The electrical interface between the MX2800 STS-1and the control terminal. The control terminal is used to communicate commands to the unit.

CSU

Channel service unit. A device used to connect a digital phone line coming in from the phone company to either a multiplexer, channel bank, or directly to another device producing a digital signal; for example, a digital PBX, a PC, or data communications device. A CSU performs certain line-conditioningand equalization functions, and responds to loopback commands sent from the central office. A CSU also regenerates digital signals. It monitors them for problems and provides a way of testing the digital circuit.

CTS

Clear to send. A signal on the DTE interface indicating that the DCE is clear to send data.

data communications equipment

See DCE.

data service unit

See DSU.

dB

Decibel. A unit of measure of signal strength; usually the relation between a transmitted signal and a standard signal source.

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Appendix D. Glossary

DCE

Data communications equipment. Device that provides all the functions required for connection to telephone company lines and for converting signals between telephone lines and DTE. Also see DTE.

DDS

Digital data service. A private line digital service for transmitting data end-to-endat speeds of 2.4, 4.8, 9.6, and 56 kbps (and in some cases 19.2, 38.4, or 64 kbps). The systems can use central hub offices for obtaining test access, bridging legs ofmulti-pointcircuits, and cross connecting equipment. DDS is offered on aninter-LATA(local access and transport area) basis by AT&T and on anintra-LATAbasis by the Bell operating companies.

delay

The amount of time by which a signal is delayed. A round-triptransmission delay measurement helps detect possible causes of protocol timeouts.

DLCI

Datalink communications identifier. A unique number assigned to a PVC endpoint in a frame relay network. Identifies a particular PVC endpoint within a user's access channel in a frame relay network and has local significance only to that channel.

DS1

Digital signal level one. Twenty-fourDS0 channels make up one DS1 (total bandwidth is 1.544 Mbps).

DS3

Digital signal level three. Equivalent of 28 DS1s and 672 DS0s (total bandwidth is 44.736 Mbps).

DSR

Data set ready. A signal on the DTE interface that indicates if a connection exists and if the devices are ready to start handshaking control signals so communications can begin.

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Appendix D. Glossary

DSU

Data service unit. A device designed to transmit and receive digital data on digital transmission facilities.

DTE

Data terminal equipment. The end-userterminal or computer that plugs into the termination point (DCE) of a communications circuit. The main difference between the DCE and the DTE is that pins two and three are reversed.

E1

Transmission rates of 2.048 Mbps are available on T1 communication lines. See also T1.

end device

The ultimate source or destination of data flowing through a network (sometimes referred to as DTE).

end user

Subscriber who uses (rather than provides) telecommunications services.

ES

Errored seconds. A second with one or more coding violations (CVs).

ethernet

Transmission protocol for packet-switchingLANs.

facilities

The equipment used by carriers to provide communication services.

far end

The distant end to that being considered. Not the end where testing is being carried out.

FCC

Federal Communications Commission. The U.S. federal agency responsible for regulating interstate and international communications by radio, TV, wire, satellite, and cable.

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