RAD Data comm ASMi-31 Remote, Management, Data, Transmission, Special, Configurations, Diagnostic

Chapter 1. Introduction	ASMi-31Installation and Operation Manual
Remote	The ASMi-31 standalone modem is very conveniently managed from the
Management	master station by means of RADview, a RAD SNMP application. This
	user-friendly graphical user interface manages the ASMi-31C modem cards
	installed in the LRS-12 or LRS-24 hub and, through them, the ASMi-31
	standalone units.
	Both data and management are transmitted inband over the same line,
	simultaneously, without interference.
Data	Full duplex operation over 2-wires is achieved using the adaptive
Transmission	"echo-canceling" technique. The ASMi-31 modem uses 2B1Q line coding
	to achieve the range of 8 km/5 miles, for all data rates. This coding
	provides immunity to background noise, eliminates normal line distortion
	and permits efficient transmission over 2-wire twisted cables.
	An adaptive equalizer provides noise immunity and high performance over
	low quality lines.
Special	The ASMi-31 standalone modem unit has internal jumpers which allow for
Management	special management configurations such as point-to-point applications
Configurations	without ASMi-31C modem cards in the LRS-12 or LRS-24 hub, and also
	on-site diagnostics testing.
Diagnostic	In addition to the remote diagnostic capability, the ASMi-31 standalone
Capabilities	modem provides diagnostic capabilities which can be executed locally.
	These include the Digital Loopback (RLB) and Analog Loopback (LLB)
	diagnostics; they are executed via the DTE interface after the appropriate
	jumpers are set. The ASMi-31 unit has a blank panel to prevent
	unauthorized operation at the customer premises.
	The local diagnostics are as follows:
	• Remote Digital Loopback – REM, activated by pin in DTE interface and
	supported by respective standard.
	• Analog Loopback – Local (ANA defined by the standard as LLB),
	activated by pin in DTE interface and supported by the respective
	standard.
Note	The ASMi-31 loopbacks do not operate with the X.21 and G.703
	(Codirectional) because they are not supported by these standards.
Overload	The ASMi-31 modem is coupled to the line through an isolation transformer
Protection	which protects against AC or DC overvoltages. The protection circuitry
	permits operation even when DC is connected to the line.

1-4 Functional Description

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