M
ULTI
-S
OURCE
S
YSTEM BASED ON
S
YSTEM
7001RC
Multi-Source Function System 7001RC - V02.01
23 / 31
hopf
Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
Specific conditions:
•
The announcement bit remains set if the system is switched off and back on again
within the announcement hour. The ST/WT changeover is carried out after the
announcement hour has expired.
•
If the system is only switched back on again after the end of the announcement hour
the system operates with the correct new time base.
•
If a sync. source that was set by the announcement bit fails the announcement bit
continues to be set and the ST/WT changeover is executed.
•
If a changeover from one source to another takes place during the announcement
hour the announcement bit continues to be set and is executed even if the second
sync. source does
not
transmit an announcement bit.
If a changeover from one source to another takes place during the
announcement hour the announcement bit continues to be set even if the
second sync. source transmits completely different time information from
the first sync. source. The ST/WT changeover then takes place at an
incorrect time.
2.7 Connection of the Synchronisation Channels
The sync. sources are fed to various signal inputs in the system.
When designing the system the required and according hardware
components for the input of the requested signals are to be considered.
2.7.1 GPS - Channel 1
A BNC socket is available on the front panel of the 7020RC board for connecting a GPS
signal. This can be received by a
hopf
GPS antenna device.
2.7.2 DCF77 Pulse - Channel 2
The hardware for this signal input is only available on the internal VG strip of the 7020RC
control board.
This signal input is internal to the system and must be made accessible to the customer
externally. The way to achieve this depends on the respective signal level and the
configuration of the system in which the DCF77 pulse is available.
This point should be considered when planning the system.
7020RC Board VG Strip Assignment
Vcc (5V DC)
a32, b32 ,c32
Gnd
Power Supply
a31, b31, c31
DCF77 pulse Input (TTL)
Synchronisation
Channel 2
a22
