RAD Data comm RIC-E1 operation manual Selecting the IR-X.21B Timing, EXT Clock Mode

Appendix E IR-X.21B Interface Module RIC-E1Installation and Operation Manual

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-4illustrates 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.

E-2 Selecting the IR-X.21B Timing

Order from: Cutter Networks Ph:727-398-5252/Fax:727-397-9610 www.bestdatasource.com