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Error (ER)
Ring (RR)
END
END and Error
(EER)
Controls and Indicators
Options
STRB Options
70/722 Synchronous
Transmitter -Receiver
Buffer
• When a command is present, but after an RDY (except during automatic
calling) and prior to END; the STRB indicates an error condition to the
CCM via an Error Report (ER). An ER is caused by the following:
1. Transmit - None.
2. Receive - Loss of the data set OCD signal, prior to TERC.
The STRB reports such conditions once per occurrence.
If
error and malfunction conditions occur simultaneously, only the MR
is indicated to the CCM.
•
The STRB is always conditioned to detect an RI signal from the data set
and report a Ring (RR) to the CCM; except when a Disconnect or a Receive
command is present (i.e., prior to END).
The STRB reports a Ring only once per RI signal from the data set.
•
The STRB reports END whenever it completes the operations required
by each command as previously indicated. END is enabled by a TERC or a
DISC from the C CM.
•
The STRB indicates a concurrent END, and error condition by means of
the END and Error Report (EER).
•
The operator's controls and indicators for the STRB are located on the
CCM Control Panel. They consist of the following:
10 Data (white indicator) - This indicator lights whenever the STRB
exchanges data signals with a remote device.
2.
Select (patch panel) - The STRB is easily connected to any CCM
Select (SEL) line, and is thereby enabled if power is on. When the
STRB is enabled, it responds to each SEL with BOP.
•
The STRB options covered are field-installable via wiring changes,
depending upon the requirements of the remote device and conlmunication
facility. These options affect the STRB line control functions upon initiation
and termination of Transmit and Receive Commands. The STRB is origi-
nally conditioned for half-duplex, two-wire operation.
•
Half-duplex, Two - Wire - This mode of operation is employed when
operating half-duplex, two-wire. The effect of the option is as follows:
1.
Transmit - Upon initiation, RS and DTR are turned on; and RDY is
enabled with DSR and CTS are on. Upon termination, one MS after
the last bit is transmitted, RS is turned off and END occurs
o
2.
Receive - Upon initiation, DTR is turned on; and RDY is permitted
when DSR and DCD are on.
4-33
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