DCP Series Telcon Message Manual - Public Support Login - Unisys

Glossary
PDNTRK
The S.25 DCP-toDCP (Trunk) interface. This procedure is defined in the X.25 PSCS
element PDNTRK. PDNTRK provides an interface between DNS and the X.25 packet-level
protocol. It also controls the number of virtual circuit connections needed depending
upon the amount of data, or lack of data, sent over the trunk.
PDNTRNK
The nonfunctional version of the X.25 DCP-toDCP (Trunk) interface. This procedure is
defined in Telcon and is present only is X.25 PSCS is not installed.
PDNURS
PLSEUI
The terminal resources services interface for UTS 4000 Cluster Controller terminals and
asynchronous terminals defined to run over an X.25 network. This procedure is defined in
X.25 PSCS. It provides an interface with the Telcon terminal control block resource
routines and the data protocols recognized within X.25 PSCS. See also PDNPAD and
PDNL44.
The initialization handler for the packet layer services (PLS) host interface software. This
procedure is defined in both the nonfunctional Telcon element PDNPLS and the X.25
PSCS element PDNPLS. The nonfunctional procedure is present only if X.25 PSCS is not
installed. This procedure processes end user (EU) configuration statements where the
TYPE parameter is set to PLSTSU.
Port Processor Identification Number (PPID)
A number that identifies a port processor on a DCP. It is an 8-bit byte that combines the
IOP number and the hardware line module address. The hardware engineer straps the IOP
number when the IOP is installed. The most significant four bits describe the IOP number;
the least significant four bits describe the line module address.
PPID
PPLS
PSCS
See port processor identification number.
The packet layer services (PLS) host interface handler. This procedure is defined in X.25
PSCS element PDNPLS. It provides an interface between the X.25 packet-level protocol
and an application on an OS 2200 host that uses GASIF.
See Packet Switched Communications Software and X.25 Packet Switched
Communications Software.
Public Data Network (PDN)
A digital data network that provides communication service for customer hosts and
terminals. Public data networks use either the X.25 packet-switched protocol (see PSCS)
or the circuit-switched X.21 protocol. See also Packet Switched Communications
Software.
Public Data Network Multi Link Level Protocol (PDNMLP)
Implements the X.25 multi link-level protocol. This procedure is defined in X.25 PSCS
element PDNMLP. It provides an interface between the X.25 packet-level protocol and the
X.25 link-level (level 2) protocol.
Glossary–14 7436 0728–303