CHANNEL RATES AND FORMS

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3010

demultiplexers are receiving inputs from a single

without associated timing; and voice data. The rates at

multiplexer (paragraph 3-9), port assignments within

which data inputs may occur depend upon the input form

each demultiplexer must match those of the transmitting

and the mode in which they are processed by the

multiplexer.

multiplexer set. Specific form and rate limitations are

discussed in paragraphs 3-19 through 3-24.

3-16. In summary, a port is an interval of time during

which a bit of data is inserted into the multiplexer's serial

3-19. DIGITAL DATA WITH ASSOCIATED TIMING.

output stream. For a given configuration, one or more

3-20. One of the channel input/output data forms

ports may be assigned to a particular channel; the total

accepted and processed by the multiplexer set is digital

for the channel is termed K. The product of K and the

data with associated timing. This data form is commonly

rate at which porting occurs (Ro) must equal or exceed

referred to as Type I, and is illustrated in figure 3-3. Note

the channel input rate (Ro). The total quantity of ports

that one complete cycle of the input/output timing signal

assigned to channels in a given multiplexer configuration

occurs for each bit time (T) of the data signal in figure 3-

is termed N, and when the overhead port is considered,

3. The multiplexer set accepts and processes Type I

the total number of ports in use is N + 1. The value for N

channel data at any rate between 50 bps and 3.0 Mbps,

+ 1 varies between 16 and 32. Multiplexer output rate

provided the rate satisfies the expression:

(Ro) is equal to Ro (N + 1). Regardless of system

0.96 > K(1 - c)

application, port-to-channel assignments in a receiving

demultiplexer must exactly match those of the

transmitting multiplexer.

3-17. CHANNEL RATES AND FORMS.

where

Rc = channel data rate

3-18.The multiplexer set will accept and properly process

charnel inputs of varying forms and rates. Input forms

include the following: digital data with associated timing;

Rp = port rate

digital data

K = number of ports assigned to

the channel

Figure 3-3. Typical Type I Channel Input/Output Data and Timing Waveforms

3-5