Raisecom Technology Co., Ltd
20
be closed and DTE device will have some reflection.
When the fault pass function is enabled, and if there is remote alarm on fiber optic modem,
that is to say there are errors on fiber transmitting side, the CTS signal of V.35 interface
will be closed and DTE device will have some reflection.
The DSR signal of this series device will be always valid after power on.
2. the 2
nd
, 3
rd
and 4
th
bit: Reserved (Default is OFF)
These bits are reserved for testing and they should be all OFF when the device works
normally.
3. the 5
th
, 6
th
, 7
th
and 8
th
bit: Vendor configuration bits
These bits are configured by vendor during the producing process and should not be
changed by users.
4.3.4. Impedance Choosing Dip-switch SW7
The SW7 is E1 interface impedance choosing dip-switch and “ON, ON, ON, OFF” is in
default.
75
Ω
BNC unbalanced interface
120
Ω
RJ-45 balanced interface
1
st
bit
2
nd
bit
3
rd
bit
4
th
bit
1
st
bit
2
nd
bit
3
rd
bit
4
th
bit
ON
ON
ON
ON
OFF
OFF OFF OFF
1
st
bit: transmitting side “TX-“is grounding.
2
nd
bit: receiving side “RX-“is grounding.
3
rd
bit: impedance adjustment of receiving side.
4
th
bit: impedance adjustment of transmitting side.
4.4. Relationship of Dip-switch Configuration and Software
Configuration
The relationship of dip-switch configuration and software management ability is shown in
below table:
Dip-switch
Whether the software can change dip-switches’ configuration or not
SW1-SW4 Can
SW5 Can
SW6 Can
Not
SW7 Can
Not
