Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-18
protocol module
protocol module. A program that runs in a communications line interface processor (CLIP)
and implements a communications protocol, normally a link-level protocol.
PU. See physical unit (PU).
public data network (PDN). An X.25 packet-switched data network (PSDN), operated by a
public institution, and available, by subscription, to a broad range of users.
remote bridge. A device that connects local area networks (LANs) in different geographic
locations. See also bridge; contrast with remote bridge.
requester process. A process that requests the services of another process, often on
behalf of users or other processes. A requester process uses interprocess messages
to communicate with a server. Similar to the term client used by some other vendors.
See also service class.
requester-server model. The rules for communication between processes. One process,
the requester, makes a request of the other process, the server. The server takes the
requested action and then replies to the requester.
responder. The File Transfer, Access, and Management (FTAM) process that receives
requests for associations and file operations from other systems in an Open Systems
Interconnection (OSI) network. See also initiator.
route. The whole distance data must traverse from a sending node to a receiving node,
potentially consisting of many physical connections and traversing any number of
intermediate nodes.
RS-232C. One of the most commonly implemented electrical interface standards, defined by
the Electronic Industries Association (EIA). RS is an acronym for Recommended
Standard; there are others, distinguished by number: for example, RS-422.
satellite-connect line-handler process. An Expand line-handler process that implements
the satellite-efficient version of the High-Level Data Link Control (HDLC) protocol,
HDLC Extended Mode. This type of Expand line-handler process is provided for use
with satellite connections but can also be used to manage terrestrial lines.
SCF. See Subsystem Control Facility (SCF)..
SCP. See Subsystem Control Facility (SCF)..
SDLC. An acronym for Synchronous Data-Link Control.
Secure Socket Layer (SSL) or Transport Layer Security (TLS) . is a data communication
protocol that implements three cryptographic assurances:authentication, confidentiality,
and message integrity. SSL also provides secure key exchange between an client (an
Internet browser) and a server. SSL/TLS does not offer nonrepudiation.