RAD Data comm RIC-E1 E.2 Selecting the IR-X.21B Timing

Appendix E IR-X.21B Interface Module RIC-E1 Installation and Operation Manual
E-2 Selecting the IR-X.21B Timing
E.2 Selecting the IR-X.21B Timing
IR-X.21B interface module supports two clock modes:
• EXT (external)
• INT/LBT (internal/receive).
You must set the IR-X.21B clock to match the timing you have selected for RIC-E1.
The clock settings are made via the JP2 jumper located on the IR-X.21B board, as
shown in Figure E-3.
JP2
EXT INT/LBT
Figure E-3. IR-X.21B Module Layout
EXT Clock Mode
The EXT clock mode is used in applications of X.21 networks where the system
timing is provided by the X.21 network. The IR-X.21B module has an internal
16-bit FIFO buffer to compensate for the phase delay introduced to the system by
the line delay between the two units. Figure E-4 illustrates the buffer connection
and the flow of the receive, transmit and clock signals.
When RIC-E1operates in the external clock, you must set the IR-X.21B JP2 jumper
to EXT.
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