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Interface leds, Interface cable – H3C Technologies H3C MSR 50 User Manual

Page 38

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2-18

DIP switch

Description

75-ohm impedance

120-ohm impedance

3BIT

ON

OFF

4BIT

ON

OFF

5BIT

ON

OFF

6BIT

Switch for RxRing
grounding mode options

OFF: RxRing grounding
via capacitor
ON: RxRing directly
grounding

7BIT

Switch for RxShield
grounding options

ON: RxShield grounding
OFF: RxShield
ungrounding

8BIT

Switch for RxShield
grounding options

OFF: RxShield grounding
via capacitor
ON: RxShield directly
grounding

z

When setting internal DIP switch, you are recommended to: turn ON all BITs from 1 to 8 when a
75-ohm cable is connected. Turn OFF all BITs from 1 to 8 when a 120-ohm cable is connected;

z

The default configuration of internal DIP switch is that all the 8 positions of the BIT switch are ON,
that is, the E1 interface impedance is 75-ohm.

Interface LEDs

SIC-EPRI panel is shown in the following figure:

Figure 2-17 SIC-EPRI panel

The status description of the LEDs is given in the following table:

Table 2-17 Description of the LEDs on SIC-EPRI panel

LED

Description

LINK

z

ON means carrier signal has been received.

z

OFF means no carrier signal has been received.

ACT

z

OFF means no data is being transmitted or received.

z

Blinking means data is being received or/and transmitted.

Interface cable

Interface cables for SIC-EPRI are standard E1 G.703 cables. E1 G.703 cables have two types: 75-ohm
unbalanced coaxial cables and 120-ohm balanced twisted pair cables, shown as follows:

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