TM 11-5805-715-34/EE119-DB-MMI-010/E154 CV3478/TO 31W2-2TTC39-12
CHAPTER 2
FUNCTIONING OF EQUIPMENT
2-2. Functional Description
2-1. Scope
The basic function of the NIU is to convert the
This chapter presents the functional description of
AN/TTC-38 2600-Hz single frequency (SF)
the NIU. A simplified functional block diagram of
signaling (dial tone) and supervision to the NATO
the NIU is shown in figure FO-2. The diagram
standard dc. The NIU interfaces with the Circuit
illustrates the transmit path and receive path and is
Switch AN/ TTC-39 on one side and with a foreign
described in the following paragraphs.
NIU on the other as shown in figure 2-1. The unit
connects with four wires to the SF adapter within
the AN/ TTC-39 as shown. It presents six wires to
the foreign NIU: four wires for voice transmission,
VYX and VXY; and two wires for signaling, SYX and
SXY.
2-1
Previous Page
