Start-stop and binary synchronous terminals can be migrated to a 3745 with the
IBM Network Terminal Option (NTO) program. For start-stop protocols, NCP
supports a variety of transmission codes including ASCII, EBCDIC, EBCD, and
BCD. Further, it supports a correspondence code for which it provides translation
from and to EBCDIC. For the BSC protocol, this support and translation operation
is performed by the scanners.
NCP provides the controller flexibility to meet the demands of an expanding
network. It works with the host access method to control networks, from the
simplest single-domain network with a single controller, to complex multiple-domain
networks using the Advanced Communications Function, in accordance with the
concepts of SNA.
NCP includes the following functions:
Token-ring interface
Airline Line Control Interface (ALCI) (optional/feature).
NCP coexists with the following IBM licensed programs:
Network Routing Facility (NRF)
Network Terminal Option (NTO)
Non-SNA Interconnection (NSI)
X.25 NCP Packet Switching Interface (NPSI)
X.25 SNA Interconnection (XI)
X.21 Short Hold Mode/Multiple Port Sharing (X.21 SH/MPS).
Partitioned Emulation Programming Extension
The partitioned emulation programming (PEP) extension of NCP allows the NCP
and the EP to coexist in the same 3745. PEP lets NCP operate certain lines in
network control mode while operating others in emulation mode.
PEP can run only in a channel-attached controller. Channel attachment must be a
byte multiplexer channel, where one emulated subchannel address is specified per
EP line. Buffer chaining process does not support EP traffic under PEP.
PEP emulates most of the functions of the IBM 2701 Data Adapter Unit, IBM 2702
Transmission Control, or IBM 2703 Transmission Control and can communicate
with various access methods running in the host. Most programs written for these
machines can operate in a 3745 without modification. However, programs that
involve timing or special hardware considerations may have to be changed.
Generating and Loading the Control Program
We use SSP elsewhere on the owning host to generate the control program load
module (up to 6MB) and to load it into the controller storage. The control program
for the controller is generated from standard program modules of the NCP library
using the NCP/EP definition facility (NDF). The control program must reflect the
required controller configuration. Several control programs can be generated to
handle different subsets of lines attached to the same controller.
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IBM 3745 Models 130, 150, 170: Introduction
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