Meinberg TCG510 - Manual (Page 12)

12
Selection of generated time code
The time code to be generated can be selected via DIL-Switches SW1-8 to SW1-8. DC-
Level Shift Codes (PWM-Signal), A00x/B00x) and modulated sine wave carrier
(A13x/B12x) are always generated simulatneously. Both signals are provided at the
VG64-Connecter, i.e if code A132 is selected also code A002 is available. This applies
for the codes AFNOR NFS 87-500 and IEEE1344 as well. Combinations of DIP
Switches SW1-5...SW1-8 not mentioned in the table below select code IRIG-B122/
B002. For correct output of the IEEE1344 format the TGV510 must be synchronized by
a Uni Erlangen/NTP telegram, for this time string contains information about the local
timezone offset. Otherwise the timezone offset is set to zero in IEEE1344 mode. All other
codes can be generated with synchronization by either a Standard Meinberg or Uni
Erlangen/NTP telegram.
SW1-5 SW1-6 SW1-7 SW1-8 Code
Off Off Off Off IRIG-B002/B122
On Off Off Off IRIG-B003/B123
Off On Off Off IRIG-A002/A132
On On Off Off IRIG-A003/A133
Off Off On Off AFNOR-NFS 87-500
On Off On Off IEEE1344
Selection of generated Code
The TFOM field in IEEE1344 code is set dependent on the 'already sync'ed' character
('#') which is sent in the serial time telegram. This character is set, whenever the
preconnected clock was not able to synchronize after power up reset. The 'time figure of
merit' ( TFOM ) field is set as follows.
Clock was synchronized once after power up : TFOM = 0000
Clock was not synchronized after power up : TFOM = 1111
For testing purposes the output of TFOM in IEEE1344 mode can be disabled. The
segment is set to all zeros then. This option can be useful, if the IRIG generators
preconnected clock cannot be synchronized during system testing.
SW1-9 Ignore TFOM
off IEEE1344+TFOM
on TFOM off
Disabling the output of TFOM