IBM 3745 Series Connection And Integration Manual page 147

or multipoint. The line can be leased or private.
Contrast with switched line.
operator console. The IBM Operator Console
that is used to operate and service the 3745
through the MOSS or the 3746-900 through the
MOSS-E.
point-to-point connection. A connection
established between two data stations for data
transmission. The connection may include
switching facilities.
Post Telephone and Telegraph (PTT). A
generic term for the government-operated
common carriers in countries other than the
U.S.A. and Canada. Examples of the PTT are
British Telecom in the United Kingdom, the
Deutsche Bundespost in Germany, and the
Nippon Telephone and Telegraph Public
Corporation in Japan.
remote support facility (RSF). RSF provides
I BM maintenance assistance when requested via
the public switched network. It is connected to the
IBM RETAIN database system.
; scanner. A device that scans and controls the
transmission lines. Also called line adapter.
secondary modem. A secondary device on a
multipoint line.
service processor. The operator console for the
Models 21A, 31A, 41A, and 61A, which is
attached to the 3745 and 3746-900 via a
token-ring LAN. It runs contiguously transferring
code to and from the processors inside the
controller.
service representative. See IBM service
representative
services. A set of functions designed to simplify
the maintenance of a device or system.
switched line. A transmission line with which the
connections are established by dialing, only when
data transmission is needed. The connection is
point-to-point and uses a different transmission
line each time it is established. Contrast with
nons witched line.
X-6
3745 All Models & 3746-900: CIG
Synchronous Data Link Control (SOLC). A
discipline for managing synchronous,
code-transparent, serial-by-bit information transfer
over a link connection. Transmission exchanges
may be duplex or half-duplex over switched or
nonswitched links. The configuration of the link
connection may be point-to-point, multipoint, or
loop. SDLC conforms to subsets of the Advanced
Data Communication Control Procedures of the
American National Standards I nstitute and
High-Level Data Link Control (HDLC) of the
I nternational Standards Organ ization.
synchronous transmission. Data transmission
in which the sending and receiving instruments
are operating continuously at substantially the
same frequency and are maintained, through
correction, in a desired phase relationship.
Contrast with asynchronous transmission.
systems network architecture (SNA). The
description of the logical structure, formats,
protocols, and operational sequences for
transmitting information units through, and
controlling the configuration and operation of,
networks.
Telecommunications Access Method (TCAM).
An access method used to transfer data between
main storage and remote or local terminals.
telecommunication line. Any physical medium,
such as a wire or microwave beam, that is used to
transmit data.
time out. A time interval allotted for certain
operations to occur.
token-ring interface coupler type 2 (TIC2). A
circuit that attaches an IBM Token-Ring network to
an IBM 3745.
token-ring interface coupler type 3 (TIC3). A
circuit that attaches an IBM Token-Ring network to
an IBM 3746-900 or 3746-950.
token-ring adapter (TRA). Line adapter for IBM
Token-Ring Network, composed of one token-ring
multiplexor card (TRM), and two token-ring
interface couplers (TICs).
token-ring interface coupler (TIC). A circuit that
attaches up to two IBM Token-Ring networks to
the controller.
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