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3. HARDWARE CONFIGURATION AND HANDLING
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3.8 Optical Link Interface
The optical link interface circuit is shown in Fig.
3.4. Each state of interface is explained below.
circuit
Fig.
3.4
Optical Link Unit Interface Circuit
(
Data receiving
-
online
1
During data receiving in the online mode, SWA
is
open and SWB is closed as shown in Fig. 3.5. Send
data from the exterior are input t o the internal
processing circuit through the receiver (R), and a t
the same time, sent from the driver (D) to the next
channel via SWB.
SWB
I
nter nal
pro cessi ng
circuit
Fig.
3.5
Online
-
Data Communication
- -
- -
, - , O U T
SWA
- T I
(Data sending - online
1
/
During data sending in the online mode, SWA is
closed and SWB is open as shown in Fig. 3.6. Send
data transferred from the internal processing
circuit are sent from the driver (D) to the next
channel via SWA.
Internal
processing
circuit
- -
--
1
Fig. 3.6 Online
-
Data Communication
(m)
--
--
OUT
SWA
In the offline mode, SWA
is
open and SWB is
closed as shown in Fig. 3.7. (The state is the same
as that of data receiving.) Send data from the
exterior are sent to the next channel via the
receiver (R), SWA and the driver (D). For the
offline mode, the internal processing circuit is
automat ica I
I
y
stopped.
internal
p rocessi ng
circuit
IN
Fig. 3.7 Offline
- -
- -
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