Rad-data-comm ASMi-31 Manuel d'utilisateur télécharger pdf (Page 53)

X.21 Connectors C-1

Appendix C

X.21 Interface Module

C.1 General

IR-X.21 is an interface module for RAD modems, converting X.21 signals to

TTL levels. The converted data is sent over the modem link, using the

modem modulation technique, and is converted back at the other end into

X.21 signals, or into any other digital interface signal.

ASMi-31 is generally supplied with IR-X.21. This is due to an internal FIFO

that assumes the phase mismatch when the clock is supplied by an external

source. ASMi-31 also has the option to order IR-X.21 for extra buffers.

Figure C-1 shows a typical application of the ASMi-31 standalone modem

with the IR-X.21 interface module.

Figure C-1 Typical ASMi-31 X.21 Application

C.2 X.21 Connectors

Figure C-2 shows the rear panel of a standalone ASMi-31 with the

IR-X.21 interface module.

Line Connector

Figure C-2 ASMi-31 Rear Panel with X.21 Connector

The ASMi-31 modem rack version requires an additional adaptor to connect

between the DB-15 connector of the X.21 equipment to the DB-25

connector of the ASM-MN-214 modem rack. For this purpose, an optional

DB-15 attachment CIA/X.21 can be ordered separately from RAD. The

attachment connects to the ASM-MN-214 rear panel as shown for the

CIA/V.35 attachment in Chapter 5.

Order from: Cutter Networks

Ph:727-398-5252/Fax:727-397-9610

www.bestdatasource.com

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 65 66

Pas de commentaire

Rad-data-comm ASMi-31 Manuel d'utilisateur Page 53