Chapter 2. Installation and Setup ASM-20 Installation and Operation Manual
2-2 Electrical Installation 11/4/99 14:09
2.3 Package Contents
The ASM-20 package includes the following items:
• ASM-20
• AC cord
• 48 VDC plug (optional)
• Adapter cable for the different interfaces (optional)
• ASM-20 Installation and Operation Manual.
2.4 Mechanical Installation
ASM-20 is a standalone device designed to be placed on a tabletop or
bench. It is delivered completely assembled. No provisions are made for
bolting ASM-20 to the tabletop.
2.5 Electrical Installation
The line and digital interface connectors (located on the rear panel of
ASM-20) consist of a DTE interface connector and a five-screw terminal
block. The DTE interface connector may be 34-pin for V.35 (see Figure 2-1),
15-pin for X.21 (see Figure 2-2) or 25-pin for RS-530/RS-422 or
RS-232/V.24.
The terminal block provides a connection between transmit and receive
twisted pair lines. The transmit and receive pairs are polarity insensitive. The
transmit pair is connected to the terminals marked XMT, the receive pair is
connected to the terminals marked RCV. If the cable is shielded, the shield
may be connected to the terminal marked GND.
DTE XMT RCV GND
Figure 2-1 ASM-20 - V.35 Rear Panel