Direct-current interlock (DCI)
High-speed transfer
Data streaming.
Depending on the programming support, CAs can be operated:
In native mode under NCP control. Only one channel address is used to
transmit all data to a host.
In partitioned mode under PEP control. PEP operates certain lines in native
mode, while operating other lines in emulation mode (EP mode). One
subchannel address is required per line. Channel attachment is
byte-multiplexed.
CAs also support I/O error alert. They use self-checking routines. CA features and
parameters are defined at installation time and saved in the MOSS. They are set
up by the MOSS at each initial program load (IPL) afterwards. Channel adapters
can be enabled and disabled by the operator from the attached operator console at
any time without having to log onto the console.
The channel interface cable allows attachment of the 3745 to a host located at up
to 61 m (200 ft) in direct-current interlock or high-speed transfer mode.
Channel Adapter with Data Streaming
The data streaming feature makes it possible to reach a high-speed data rate for a
host located at up to 122 m (400 ft) from the controller. Data can be transferred in
synchronous mode. The instantaneous data rate can reach a maximum speed of
3MB per second.
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Channel adapter with data streaming is supported by the IBM 937X, 3090, and
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ES/9000 Processors. The host connection can only be a block multiplexer channel.
The channel extenders are not supported.
Buffer Chaining Channel Adapter
The buffer chaining process makes it possible to increase high speed data rate for
a host and provides higher channel efficiency than data streaming. Data can be
transferred in synchronous mode. Buffer chaining process is only supported by
channel adapter of the BCCA type.
The buffer chaining process is available under NCP or PEP control. The buffer
chaining channel adapter supports NCP only. The EP traffic under PEP is not
supported. The host connection can only be a block multiplexer channel. When
buffer chaining process is not set, the buffer chaining channel adapter works in
data streaming mode. The channel extenders are not supported.
Two-Processor Switch
In addition to the basic interface (A), a two-processor switch (TPS) provides an
additional channel interface, called interface B, to a channel adapter. The two
interfaces can connect to the same host or to different hosts.
MOSS commands issued at the console allow the user to enable, through a
two-processor switch, either one interface (A or B) or both interfaces (A and B).
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IBM 3745 Models 130, 150, 170: Introduction
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