Specifications

Appendix D IR-X.21Interface Module FOM-40 Installation and Operation Manual
D-2 Selecting the IR-X.21 Timing
Table D-1. IR-X.21 Connector Pin Assignment (Cont.)
Pin ID Function
9 B Transmit B
10 B Control B
11 B Receive B
12 B Indication B
13 B Signal Timing B
14 B External Timing
D.2 Selecting the IR-X.21 Timing
IR-X.21 interface module supports two clock modes:
• EXT (External)
• INT/LBT (Internal/Receive).
Set the IR-X.21 clock to match the timing selected for the FOM-40 modem. The
clock settings are made using the JP2 jumper located on the IR-X.21 board, as
shown in Figure D-3.
JP2
EXT INT/LBT
Figure D-3. IR-X.21 Module Layout