Rad-data-comm ASM-20 Instrukcja Użytkownika Pobierz pdf (Strona 61)

ASM-20 Installation and Operation Manual Appendix C IR-X.21B 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.21B Interface Module

C.4 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.21B module has internal buffers to

compensate for the phase delay introduced to the system by the line delay

between the two modems. The buffers are 16-bit FIFO’s 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 ASM-20 Instrukcja Użytkownika Strona 61