Figure 2-4. Digital Baseband Processing-Simplified Diagram.

TM 11-5895-1123-34

Figure 2-4.

Digital Baseband Processing-Simplified Diagram.

b. The digital inputs from the users can be four 20-

however, can handle data streams of up to a 9.9999

Mb/s rate (commonly referred to as 10 Mb/s). An

kbs/s channels, a 256 or 512-kb/s channel, two 50-kb/s

additional input line is provided at the data entry panel

Hybrid channels, and a channel which can be operated

so that a 10 Mb/s mission bit stream from an external

at any data rate up to 9.9999 Mb/s (10 Mb/ s). The four

multiplexer can be routed directly to the online modem.

20-kb/s channels and the 256/512-kb/s channels are

This input is patched to the modem by way of the data

patched from the data entry panel through the data

patch panel to the multiplexer for further processing.

patch panel.

f. The operation described above is the same for

The two 50-kb/s Hybrid channels, which are externally

receiving data, except the data passes through the unit

encrypted for secure voice transmission, must first pass

in the reverse direction to the field user.

through A-to-D con verters before being sent to the

multiplexer.

c. The A-to-D converters change the analog hybrid

2-6.

Multiplexer/Modem Processing Units

signals applied to the inputs to digital data that is

compatible with the multiplexer input.

a. Figure 2-5 is a simplified diagram of the

d After the analog hybrid signals are converted to digital

Multiplexer/Modem processing functions. As can be

form, they are patched back through the data patch

seen dual equipments are provided throughout this part

panel to the online multiplexer.

of the CSS to provide a backup supplement in case of

e. The multiplexers in the CSS are limited to a

equipment

failure

maximum mission bit stream data rate of 1.544 me 2-8

ing-Simplified Diagram. gabits per second. The modems,

2-8