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Note:
1. Before setting up the remote E1 loopback testing, please make sure that there is no alarm at the
optical interface.
2. To set up any loopback on the local PDH multiplexer, the loopback settings of the remote device
must by NO loopback.
Bit 7
OFF
ON
When the Auto-Laser-Shutdown function is enabled, the TX of the optical transceiver will be shut
down if loss of receiving signal alarm occurs at the optical interface.
Bit 8
OFF
ON
Note: Before electrifying the device, please make sure that the status of SW1 Bit 8 is OFF. Otherwise, the
device can not start properly.
Address code setting switch SW2:
When the 4 bits of the address code setting switch SW2 are all OFF, the device can be managed as a
remote device. Otherwise, the device can be managed by the serial port of a local PC via the
LNK-UP interface on the device. Different device in the cascade of one serial port must have
different address code. For the 4-bit DIP switch SW2, the 4 bits from the left to the right are bit 1~4.
At most 15 devices are allowed to be in one local cascade.
The table below lists the relationship between the settings of SW2 and the address code of the
device.
Bit 6: Reserved
Bit 7: Auto-Laser-Shutdown (ALS) function switch
ALS function
Disable
Enable
Bit 8: software online upgrade function switch
Software online upgrade function
Disable
Enable
When the software online upgrade function is enabled, users can upgrade the software on the
device at the local site via serial COM port of a PC. The software online upgrade function
makes device maintenance and upgrade easier. For a RC831-240E device under regular use,
please do not change the status of the switch and keep its default setting (OFF). Otherwise,
the improper setting of the switch may lead to operation abnormity.
User Manual
12
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