Chapter 1. Introduction | | | | | ASMi-31Installation and Operation Manual |
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Application | Figure 1-1illustrates the ASMi-31 application. |
Backbone | | | | | | 2-wire | |
| | | | | | HS-U card |
| | | | | |
| | | | | | ASMi-31 |
| | MP-2100 |
| Figure 1-1 ASMi-31 Working Opposite HS-U Card in Megaplex-2100 |
Features | The ASMi-31 short range modem supports full duplex transmission over |
| | 2-wire twisted pair unconditioned lines. |
The ASMi-31 modem operates in pairs with either another standalone modem, or as a card installed in the ASM-MN-214 hub.
A management channel transmitted in-band allows remote configuration for the modem, real-time alerts on failures, and diagnostic testing. The line data rate is selectable from 1.2 kbps up to 128 kbps and the line encoding is 2B1Q. ASMi-31 achieves an operating range up to 8 km (5 miles) over
24 AWG wire, independent of data rate.
The ASMi-31 modem is fully compatible with ASM-31 and SRM-31 and works opposite MP-2100/HS-U module.
The ASMi-31 modem features automatic rate detection in external clock mode for tail-end applications.
Control Signal Transfers
ASMi-31 supports end-to-end transfer of two control signals: DTR to DSR and RTS to DCD, except for the V.35 interface or any other standard that doesn't support this signal (such as X.21, G.703).
Interfaces
ASMi-31 supports the following interfaces: V.24/RS-232, V.35, X.21,
V.36/RS-449, RS-530, G.703 Codirectional, or built-in Ethernet bridge.
Diagnostics
ASMi-31 contains two diagnostic loops for complete diagnostics of both local and remote modems:
Local analog loopback
Remote digital loopback
Both loopbacks are controlled via pins in the DTE interface and are supported by their respective standards.
1-2 Overview
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