H3C MSR Router Comware 5 Series Manual page 178

Table 225 Description for DIP switch settings
DIP
1BIT
2BIT
3BIT
4BIT
5BIT
6BIT
7BIT
8BIT
Connecting a 1/2/4/8-port E1 75-ohm cable (D15/D68 <----> BNC)
CAUTION:
Make sure you insert the cable into the right interface so as to avoid damages to the interface
module or the chassis.
•
If you do not need to extend the cable, you can directly connect the BNC connectors of the E1
75-ohm cable to the remote network device as follows:
Connect the D15/D68 connector of the E1 75-ohm cable to the D15/D68 interface of the
1.
interface module and fasten the bolts to fix the cable.
The other end of the cable provides one pair or multiple pairs of 75-ohm BNC connectors.
2.
Connect the TX connectors and the RX connectors on this end to the RX connectors and the TX
connectors on the remote device respectively.
Description
75-ohm/120-ohm
selection switch
RxRing grounding mode
selection switch
RxShield grounding
mode selection switch
SxShield grounding
mode selection switch
169
Configuration of
75-ohm impedance
ON
ON
ON
ON
ON
Off: RxRing is grounded
via capacitance.
ON: RxRing is grounded
directly.
N/A
N/A
Configuration of
120-ohm impedance
Off
Off
Off
Off
Off
N/A
ON: RxShield is
grounded.
Off: RxShield is not
grounded.
Off: RxShield is
grounded via
capacitance
ON: RxShield is
grounded directly.