GatesAir PT-353, Инструкция по установке и эксплуатации, Страница: 27 / 55

3 – Installation & Operation PT/PR-353 Program Audio Module Installation & Operation Manual
Version 1.1
GatesAir 3-13
Intraplex Products
Site 1 and the DI-B port connected to the transmission line to Site 3. Individual payload channels may
connect Sites 1 and 2, 1 and 3, or 2 and 3. Also, a PT-353 transmitter may be installed at Site 1 or
Site 3 and be received simultaneously by PR-353 receivers at both of the other sites.
In the drop and insert multiplexer at Site 2, a PT-353 module can be set to transmit either toward Site
1 or toward Site 3, but not both. Similarly, a PR-353 module can be set to receive from Site 1 or from
Site 3, but not both.
When you install a PT-353 or PR-353 module in a terminal multiplexer (Site 1 or Site 3), the TERM
switch setting must be DOWN. However, when you install it in a drop and insert multiplexer (Site 2),
the TERM switch setting must be DOWN to transmit or receive via the DI-A port (toward Site 1) and
UP to transmit or receive via the DI-B port (toward Site 3).
Figure 3-7. Three-point System Example with Drop and Insert
When installed in a NetXpress IP Audio multiplexer, the TERM switch determines whether the module
communicates via the A side or the B side of the TDM bus on which it sits. To communicate via the A
side (that is, TDM Bus 1A or Bus 2A), set the TERM switch DOWN. To communicate via the B side
(that is, TDM Bus 1B or Bus 2B), set the TERM switch UP.
3.5 Indicator Lights
Table 3-7 describes the PT-353 and PR-353 modules’ indicator lights.