TM 11-5895-846-14
b. Teletype Circuits. A total of nine teletype (TTY)
circuits (fig. 6-12) are available. Five frequency-shift-
keying (FSK) circuits are fed from the junction boxes
through the CDF to the TTY/FSK patch panel. Four low-
level teletype circuits may be fed through the
miscellaneous junction box to the keyer/converters via
the TTY/ low-level patch panel. Three high-level circuits
are processed through the line isolators and
keyer/converters. All nine TTY circuits are routed from
the TTY/FSK patch panel to the filter bridge. The filter
bridge combines all nine circuits into one telegraph voice
frequency (TGVF) channel, which is sent to the
multiplexer unit. When mission requirements dictate, a
KG-81 key generator may be 6onnected between the
multiplexer and the modem.
6-22
