8194B, 8195B, 8197B
Spectracom Corporation
GPS Ageless Master Oscillator Instruction Manual
5-22
5.10
OPTION SP294 – DS1 Framed All Ones
Special Request Number SP294 provides the Spectracom Models 8195B or 8197B with
two DS1 Framed All Ones outputs. The 1544 kHz DS1 clock is derived from the 10 MHz
GPS Disciplined Oscillator. Each DS1 output consists of a Tip (T), Ring (R) and Ground
(G) connection on the rear panel terminal strip as shown in Figure 5-7.
Figure 5-7 DS1 Framed All Ones Connector
The DS1 outputs are available with D4 or ESF Framing. SP294 equipped units are
factory configured for D4 Framing. ESF Framing is enabled by moving the internal
shorting plug on HDR3 as shown in Figure 5-8. Refer to Figure 5-9 for assistance in
locating HDR3.
Figure 5-8 Frame Selection Jumper
The outputs may also be programmed to provide an Unframed All Ones (Blue Alarm) or
complete removal of signal whenever the 1544 kHz signal is not phase locked to the
disciplined 10 MHz oscillator.
