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MRV Communications, Inc. – Installation Manual
69
Indirect Chaining
Direct Chaining
Chaining Limits
The number of links that can be chained is limited due to the Jitter parameter. Sensitivity to jitter is different for
every protocol and can vary with different manufacturers. The typical number is 3-4 chained links. If more
chains are required, please consult your MRV representative.
Indirect Chaining is required for
connecting FSO units not including
clock recovery circuits. In cases of
indirect connectivity, the connection
between the two FSO units on the
same roof must be done through the
Switch or Router or another means
of connection that is located inside
the building. For example, in Fig. 2, we
use the indoor switch in building C for
the chaining.
A
B
C
Direct Chaining is the capability to
directly connect two FSO units o
n
the same roof (used as repeaters)
i.e.. direct crossing between Rx an
d
T
X of the two units. For example,
in Fig. 3 connection is achieved o
n
rooftop of building C without th
e
need to enter the building.
Direct connection is possible for
FSO that include clock recovery
circuits. The clock recovery
regenerates the signal and
enables smooth direct chaining.
Switch
A
B
C
Fi
g
. G.2
Indirect chaining
Fi
g
. G.3
Direct chaining