HP MSR2000/3000/4000 Router Series Interface Module Guide

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HP recommends that you use the DIP switch as follows: When the interface is connected to a 70-ohm
cable, turn on switches BIT1 through 8; when the interface is connected to a 120-ohm cable, turn off
switches BIT1 through 8. Description for DIP switch settings is shown in the following table:
Table 205 Description for DIP switch settings
DIP Description
Configuration of
75-ohm im
p
edance
Configuration of
120-ohm im
p
edance
1BIT
75-ohm/120-ohm
selection switch
ON OFF
2BIT ON OFF
3BIT ON OFF
4BIT ON OFF
5BIT ON OFF
6BIT
RxRing grounding mode
selection switch
OFF: RxRing is grounded
via capacitance.
ON: RxRing is grounded
directly.
—
7BIT
RxShield grounding
mode selection switch
—
ON: RxShield is
grounded.
OFF: RxShield is not
grounded.
8BIT
SxShield grounding
mode selection switch
—
OFF: RxShield is
grounded via
capacitance
ON: RxShield is
grounded directly.
Connecting a 1/2/4/8-port E1 75-ohm cable (D15/D68 <----> BNC)
CAUTION:
Make sure that you insert the cable into the ri
g
ht interface so as to avoid dama
g
es 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.
1. Connect the D15/D68 connector of the E1 75-ohm cable to the D15/D68 interface of the
interface module and fasten the bolts to fix the cable.
2. The other end of the cable provides one pair or multiple pairs of 75-ohm BNC connectors. Connect
the TX connectors and the RX connectors on this end to the RX connectors and the TX connectors on
the remote device respectively.