8194B, 8195B, 8197B
Spectracom Corporation
GPS Ageless Master Oscillator Instruction Manual
5-24
5.11
OPTION SP295 – E1 Framed All Ones
Special Request Number SP295 provides the Spectracom Models 8195B or 8197B with
two E1 Framed All Ones outputs. The 2048 kHz E1 clock is derived from the 10 MHz
GPS Disciplined Oscillator producing clock accuracies of ±1 x10
-11
for Model 8195B and
±1 x10
-12
for Model 8197B receivers. Each E1 output consists of a Tip (T), Ring (R) and
Ground (G) connection on the rear panel terminal strip as shown in Figure 5-10.
Figure 5-10 E1 Framed All Ones Connector
The E1 outputs are available with CRC4 Multiframe or CAS Multiframe. SP295
equipped units are factory configured for CRC4 Multiframe. CAS Multiframe is enabled
by moving internal shorting plugs on HDR1 of the Framed All Ones generator board as
shown in Figure 5-11. Refer to Figure 5-12 for Assistance in locating HDR1.
Figure 5-11 Frame Selection Jumpers
The outputs may also be programmed to provide either an Unframed All Ones or
complete removal of the signal whenever the 2048 kHz clock reference is not phase
locked to the disciplined 10 MHz oscillator. The unit is factory configured to provide an
Unframed All Ones when unlocked. To program the E1 outputs for complete removal
when unlocked, remove the shorting plug found on HDR5.
