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Chapter 2: Introduction
2. Introduction
These short-haul modems enable you to place a receiving device up to four miles
from the sending device. They are switch-selectable for either DCE or DTE
application, eliminating the need for special cables and preventing confusion
during installation. The short-haul modems are connected with twisted-pair cable,
using a 4-position terminal block or RJ-11. The units are optically isolated to
provide protection from differences in ground potential between the units. The
units provide line status (Data Carrier Detect when DCE is selected and Data
Terminal Ready when DTE is selected) to indicate that the remote unit is online
and ready to communicate. Two dual RED/GREEN indicators on the front panel
indicate the status of receive and transmit circuitry as well as proper polarity of
twisted-pair connections.
1 2 3 4
Figure 2-1. Front panel.
5 6 7 8 9
Figure 2-2. Back panel.
