Instruction manual
FO SERIAL
Page 9
4.3.
Clock Mode
The fibre optical modem FO is used to carry data between two DTE interfaces.
The FO also carries the clock in most cases.
A – The DTE A equipment provides the clock in internal mode, and gives it to the FO and other DTE B (router V35 / V11, V28-RS232).
Type DTE A
FO A
FO B
DTE B
A
Internal Clock
DTE Clock
Network Clock
Receive clock
B – Both equipments DTE A and DTE B receive the clock, the FO A generates the clock for DTE A and transmits it to the other FO B and DTE
B. (router V35/V11, V28-RS232)
Type DTE A
FO A
FO B
DTE B
B
Receive clock
Internal Clock
Network Clock
Receive clock
C – Both equipments DTE A and B gives the clock to the FO A, B . FO A and B are in external clock.
Type DTE A
FO A
FO B
DTE B
B
Internal clock
external Clock
external Clock
Internal clock
See Chapter 10.1.4 for signals and explanations.
FO SExx A
FO SExx B
Fibre Optical Multimode
Or Singlemode
DTE B
DTE A
FO SE28
FO SE28
Optical Fibre Multimode
Or Monomode
