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User Manual
16
RD
L
Note:
The phase relation of the TX CLK signal and TD signal of this device is self-adjusted. There is no
need for user setting.
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Bit 6: fault pass-through function switch (default OFF)
Bit 6
Fault pass-through function
ON Enable
OFF Disable
When the fault pass-through function is enabled, the device will pass the information of optical
receiving side alarm and E1 transmitting side alarm to the DCD and CTS signal of the V.35 interface,
namely, the fiber optical receiving side alarm will have the DCD signal of the V.35 interface shut
down and the optical transmitting side alarm will lead to the shutdown of CTS signal of the V.35
interface. When the fault pass-through function is disabled, the DCD signal and CTS signal of the
V.35 interface will be effective signal.
When the fault pass-through function is enabled, local alarm of the multiplexer indicates that fault
occurs on the receiving side of fiber optic. As a result, the DCD signal of the V.35 interface will be
shut down and the DTE device will react accordingly.
When the fault pass-through function is enabled, remote alarm of the multiplexer indicates that fault
occurs on the transmitting side of fiber optic. Consequently, the CTS signal of the V.35 interface will
be shut down, and the DTE device will react accordingly.
The DSR signal of the device will always be effective signal after device electrifying.
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Bit 7~8: Loopback switch (default OFF)
SW5
Bit 7
Bit 8
ON
Local loopback
Loopback enable
OFF
Remote loopback
Loopback disable
The Bit 7 of the function setting DIP switch SW5 is for setting the point for loopback, that is, for
setting the loopback to “remote loopback” or “local loopback”. The loopback setting is effective on
both E1 line and V.35 line. The loopback of RCMS2801 series devices have two directions. The
following two figures show the loopback point and loopback direction of remote loopback and local
loopback.
