August 2016 Glossary 299
R_CTL
The Routing Control field in the frame header contains a routing bits sub-field, which
has specific values indicating that FC-4 data will follow. It also contains an
information category field, which indicates to the recipient the type of data that the
frame contains.
R_RDY
Receiver Ready.
R_T_TOV
Receiver Transmitter timeout value.
RCS
Read connection status block.
Read Exchange Status Block
The Read Exchange Status Block command used in Extended Link Services. It is
restricted when originated by the initiator, restricted when originated by a drive, and
invokable when originated by a drive.
Read Link Error Status Block
The Read Link Error Status Block command used in Extended Link Services. It is
invokable when originated by the initiator, allowable when originated by a drive, and
prohibited when originated by a drive.
Read Sequence Status Block
The Read Sequence Status Block command used in Extended Link Services. It is
invokable when originated by the initiator, allowable when originated by a drive, and
prohibited when originated by a drive.
Read T10 PI (16)
The Read T10 PI (16) command requests that the device server transfer the next
record or records from tape to the host. After successful completion of a read
operation, the tape is positioned after the last block read. Each block transferred
includes user data and protection information.
Receiver Read
A primitive signal used in flow control by a receiving port to indicate to the
transmitting port that the receiving port is ready to receive more information.
REFTC
Reference Tag Check.
Reinstate Recovery Qualifier (RRQ)
The Reinstate Recovery Qualifier Command used in Extended Link Services. It is
invokable when originated by the initiator, requires a response by a drive, is
prohibited when originated by a drive.
Remove Connection
The Remove Connection Command used in Basic Link Services. It is prohibited when
originated by the initiator, and is prohibited when originated by a drive.
Report Node Capabilities Information
The Report Node Capabilities Information Command used in Extended Link
Services. It is invokable when originated by the initiator, requires a response by a
drive, is prohibited when originated by a drive.
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