TM 11-6625-3041-30/TO 33A1-8-908-12
1-12. TRANSMIT 1 AND 2 (A3 & A4) RATE SELECT (CONT)
From one to three outputs are used to control the various cir-
cuits used on all four logic cards. For example, DECODE I
output 01 controls the Master Osc (a 0 sets it to 9.216 MHz and
a 1 sets it to 8.192 MHz). DECODE I outputs 01, 02, and 03 set
the output frequency of the NRZ Clock Sel.
1-13. TRANSMIT 1(A3)NRZ OUT
Master Osc
The Master Osc produces either 9.216 MHz or 8.192 MHz depending
on the DATA RATE control setting (through the 01 output from
Decode I, which is 0 for 9.216 MHz and 1 for 8.192 MHz).
The output from the Master Osc is applied to the NRZ Clock Gen,
NRZ
which has eight different divider outputs. Seven outputs pro-
Clock Gen
duce all 13 rates associated with the NRZ outputs. An eighth
produces a 614.4 kHz output for use by the Diphase Clock Gen on
the Transmit 2 card (refer to para 1-14, Diphase Clock Gen).
The actual output from the NRZ Clock Gen depends on the output
of the Master Osc. Four example, if the Master Osc output is
8.192 MHz, the output of the 64 divider is 128 kHz. If the
Master Osc output is 9.216 MHz, the output of the 64 divider
is 144 kHz.
The outputs from the seven dividers in the NRZ Clock Gen
NRZ
are applied to the input of the NRZ Clock Sel.
Clock Sel
The input selected as the output depends on the DATA RATE con-
trol setting (through the 02, 03, and 04 outputs from Decode I).
For example, a Decode I output of 011 sets the NRZ Clock Sel
output to 128 kHz.
The output from the NRZ Clock Sel is applied as one input to
Master NRZ/
the Master NRZ/Diphase Clock Sel. The second input is the
Diphase
output from the Diphase Clock Sel on the Transmit 2 card (refer
Clock Sel
to para 1-14, Diphase Clock Sel). For NRZ signals, the 05
output from Decode I is 0, which selects the input from the
NRZ Clock Sel as the output from the Master NRZ/Diphase Clock
Sel.
