Raisecom Technology Co., Ltd
9
4.2.1
SW1 switch indication
SW1 is close to E1 interface
1
st
bit: setup E1 interface as fractional mode or transparent mode
ON=E1 fractional mode, in this case the transmission rate is N×64Kbps, N=1~31
OFF=E1 transparent mode, or unframed mode, and the transmission 2048Kbps
（
by
default
）
E1 is in transparent mode by default, and then switch SW3 is invalid. SW3 only works
in fractional mode.
2
nd
bit
：
Fault-Pass-Through switch. ON means to enable Fault-Pass-Through. When
there are LOS, LOF, AIS, CRC, RAL alarms which may lead to Ethernet interface failure, it
will report to controlling computer. Ethernet interface works normally only there is no E1
link alarm. OFF means to disable the function, that is to say there is no relation between
Ethernet interface and E1 alarms.
3
rd
bit~6
th
bits are used to set the impedance of E1 interface:
Switch
Third bit
Forth bit
Fifth bit
Sixth bit
75ohm
BNC
effective
ON ON ON OFF
120ohm RJ-45 effective
OFF
OFF
OFF
ON
Please setup interface impedance of E1interface strictly conform to the above table
，
if