RAD Data comm ASMi-31 operation manual Appendix C. X.21 Interface Module

ASMi-31Installation and Operation Manual Appendix C. X.21 Interface Module

JP 2

EXT

INT/RCV clock setting

EXT

clock setting

Connector DB-15

Figure C-3 Location of Jumper JP2 in the IR-X.21 Interface Module

C.3 EXT Mode

This mode is used in applications of X.21 networks where the system timing is provided by the X.21 network. The IR-X.21 module has an internal buffer to compensate for the phase delay introduced to the system by the line delay between the two modems. The buffer is a 16-bit FIFO connected as shown in Figure C-4. When the modem's clock mode is EXT, the JP2 jumper must be set to EXT (see Figure C-3).

EXT Mode C-3

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