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Chapter 1. Introduction | |
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Digital
Service
EXT CLK | EXT CLK |
V.54 | V.54 |
RCV CLK | RCV CLK |
V.54 | V.54 |
Figure 1-3 ASM-10/8 Tail-End for DDS Service Application
Slave
Master | Slave |
| |
| Slave |
| Figure |
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Note | In the star application, set the XMT and RCV impedance of all the modems to |
| 150W. |
Features | The |
| (EUROCOM Std. D1) to provide protection from background noise, |
| eliminate normal line distortion and permit efficient transmission and |
| reception of serial data over twisted pair cable. |
| the telephone line through isolation transformers which, in conjunction with |
| electronic circuitry, protect the device against AC or DC voltage fluctuations. |
| The protection circuitry permits operation of |
| connected to the line. |
| The modem's transmit level and transmit and receive impedances are |
| independently selectable. The transmit timing is either provided internally, |
| or it is derived externally from the data terminal or regenerated from the |
| receive signal. The modem's receive timing is regenerated from the receive |
| signal. |
Overview