RAD Data comm ASM-20 operation manual Physical Description, Front Panel

ASM-20Installation and Operation Manual Chapter 1. Introduction

Connection to an RS-449/V.36 interface is accomplished via the RS-530 interface (see Appendix A, Ethernet Interface). ASM-20 incorporates a built-in Bit Error Rate Tester (BERT). The internal BERT allows complete testing of both modems and the line without external test equipment. A front panel switch generates a pseudo-random test pattern (511-bit, according to ITU/V.52) for testing end-to-end connectivity. The ERROR LED will flash when a bit error is encountered.

	1.2 Physical Description
	ASM-20 is available as a desk-top unit or a rack-mountable card for a
	19" rack. The rack can carry up to 14 ASM-20 cards which provide a 25-pin
	D-type connection to the digital interface. Optional interface adapters for
	V.35, X.21, G703 and ETH are available. The ASM-20/R card can detect and
	indicate power failure on the remote ASM-20 standalone unit. The RPF LED
	will light up if remote power failure occurs.
Front Panel	Figure 1-4shows a general view of ASM-20.

	Figure 1-4 ASM-20, General View
LEDs	All controls (push button and LED indicators are located on the ASM-20 front
	panel (see Figure 1-4). A description of the front panel can be found in
	Controls and Indicators in Chapter 3.
Jumpers	A description of the jumpers can be found in Setting Internal Jumpers and
	Switches in Chapter 2. See Table 2-1 and Figure 2-3.
Rear Panel	Figure 1-5shows an example of an ASM-20 rear panel. A description of the
	rear panel can be found in Electrical Installation in Chapter 2.
	The line and interface connectors are located on the rear panel of ASM-20
	(see Figure 1-5).

Physical Description 1-3