Rad-data-comm ASMi-31 Manuel d'utilisateur télécharger pdf (Page 55)

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

EXT Mode C-3

JP 2

INT/RCV

clock setting

EXT

clock setting

Connector DB-15

EXT

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).

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Rad-data-comm ASMi-31 Manuel d'utilisateur Page 55