Multitech MTPSR1-202ST Podręcznik Użytkownika Pobierz pdf (Strona 98)

ProxyServer User Guide

MTPSR1-202ST

NAK (Negative Acknowledgment): Communications code used to indicate that a message was not

properly received, or that a terminal does not wish to transmit. Contrast with ACK.

Network: A group of computers connected by cables or other means and using software that enables

them to share equipment, such as printers and disk drives to exchange information.

Node: Any point within a network which has been assigned an address.

Object-Oriented: A method for structuring programs as hierarchically organized classes describing

the data and operations of objects that may interact with other objects.

Office Channel Unit - Data Port (OCU-DP): The CO channel bank used as the interface between

the customer’s DSU and the channel bank.

Off-hook: The condition of a device which has accessed a phone line (with or without using the line).

In modem use, this is equivalent to a telephone handset being picked up. Dialing and transmission

are allowed, but incoming calls are not answered. Contrast “on-hook”.

Off Premise Extension (OPX): An extension or phone that terminates in a location other than that of

the PBX. Commonly used to provide a corporate member with an extension of the PBX at home.

Ones Density: the measure of the number of logical 1s on a T1 line compared to a given total

number of bits on that line; used for timing information in data recovery in AMI and B8ZS.

On-Hook: The condition of a device which has not accessed a phone line. In modem use, this is

equivalent to a telephone handset that has not been picked up. In other words, it can receive an

incoming call. Contrast “off-hook”.

Open Shortest Path First (OSPF): A hierarchical Interior Gateway Protocol (IGP) routing algorithm

for IP that is a proposed standard for Internet. OSPF incorporates least-cost routing, equal-cost

routing, and load balancing.

Outage: The measure of the time during which a circuit is not available for use due to service inter-

rupt. Outage is the complement of circuit “availability” (100% minus % available = % outage).

Out-of-band: Signaling that is separated from the channel carrying the information (i.e., the voice/

data/video signal is separate from the carrier signal). Dialing and various other “supervisory” signals

are included in the signaling element. Contrast “In-band” signaling.

Out of Frame (OOF): A T1 alarm condition that is logged on the loss of 2, 3 or 4 of 5 consecutive FT

framing bits.

Packet: 1. In data communication, a sequence of binary digits, including data and control signals,

that is transmitted and switched as a composite whole. The data, control signals and, possibly, error

control information are arranged in a specific format. 2. Synonymous with data frame. 3. In TCP/IP,

the unit of data passed across the interface between the Internet layer and the link layer. A packet

includes an IP header and data. A packet can be a complete IP datagram or a fragment of an IP

diagram. 4. In X.25, a data transmission information unit. A group of data and control characters,

transferred as a unit, determined by the process of transmission. Commonly used data field lengths

in packets are 128 or 256 bytes. 5. The field structure and format defined in the CCITT X.25 recom-

mendation.

Packet Assembler/Dissembler (PAD): Used by devices to communicate over X.25 networks by

building or stripping X.25 information on or from a packet.

Packet Data: The information format (“packetized”) used for packet-mode calls.

Packet Mode: Refers to the switching of chunks of information for different users using statistical

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