Multitech MTPSR1-202ST Betriebsanweisung PDF herunterladen (Seite 91)

Glossary

MTPSR1-202ST

Cluster Controller: A device that can control the input/output operations of more than one device

connected to it. A cluster controller may be controlled by a program stored and executed in the unit,

or it may be entirely controlled by hardware.

Committed Burst Size: The maximum number of bits that the frame relay network agrees to transfer

during any measurement interval

Committed Information Rate (CIR): An agreement a customer makes to use a certain minimum

data transmission rate (in bps). The CIR is part of the frame relay service monthly billing, along with

actual usage, that users pay to their frame relay service provider.

Compression: 1. The process of eliminating gaps, empty fields, redundancies, and unnecessary

data to shorten the length of records or blocks. 2. In SNA, the replacement of a string of up to 64

repeated characters by an encoded control byte to reduce the length of the data stream to the LU-LU

session partner. The encoded control byte is followed by the character that was repeated (unless that

character is the prime compression character). 3. In Data Facility Hierarchical Storage Manager, the

process of moving data instead of allocated space during migration and recall in order to release

unused space. 4. Contrast with decompression.

COMx Port: A serial communications port on a PC.

congestion: A network condition where there is too much data traffic. The ITU I.233 standard defines

congestion managemennt in terms of speed and burstiness.

congestion notification: The function in frame relay that ensures that user data transmitted at a rate

higher than the CIR are allowed to slow down to the rate of the available network bandwidth.

Consecutive Severely Errored Seconds (CSES): An error condition that occurs when from 3 to 9

SES (Severely Errored Seconds) are logged consecutively.

Customer Premise Equipment (CPE): The generic term for data comm and/or terminal equipment

that resides at the user site and is owned by the user with the following exclusions: Over voltage

protection equipment, inside wiring, coin operated or pay telephones, “company-official” equipment,

mobile telephone equipment, “911” equipment, equipment necessary for the provision of communica-

tions for national defense, or multiplexing equipment used to deliver multiple channels to the cus-

tomer.

D4: the T1 4th generation channel bank.

D4 channelization: Refers to the compliance with AT&T TR 62411 for DS1 frame layout.

D4 framing: The T1 format for framing in AT&T D-Series channel banks, in which there are 12

separate 193-bit frames in a super-frame. A D4 framing bit is used to identify the channel and the

signaling frame. Signalling for voice channels is carried in-band for every channel, along with the

encoded voice. See “robbed-bit signaling”.

Data Communications Equipment (DCE): Any device which serves as the portal of entry from the

user equipment to a telecommunications facility. A modem is a DCE for the telephone network

(PSTN) that is commonly on site at the user’s premises. Packet Switched Networks have another

level of DCE which is most often located at a central office.

Data Link Connection Identifier (DLCI): One of the six components of a frame relay frame. Its

purpose is to distinguish separate virtual circuits across each access connection. Data coming into a

frame relay node is thus allowed to be sent across the interface to the specified “address”. The DLCI

is confirmed and relayed to its destination, or if the specification is in error, the frame is discarded.

Dataphone Digital Service (DDS): A private line digital service that offers 2400, 4800, 9600 and 56

Kbps data rates on an inter-LATA basis by AT&T and on an intra-LATA basis by the BOCs.

Data Service Unit (DSU): A device that provides a digital data service interface directly to the data

terminal equipment. The DSU provides loop equalization, remote and local testing capabilities, and a

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