Cisco 1601 - Router - EN Hardware Installation Manual page 93

DSU/CSU WAN Interface Cards
Table 13
Feature
AL LED
CD LED
Loopback
button
Enabling Wetting Current on T1/FT1 DSU/CSU WICs
The WIC-1DSU-T1-V2 interface card supports wetting current. Wetting current is a small amount of
electrical current (60 to 140 milliamps) sent from the central office to the card to prevent the corrosion
of electrical contacts in the card's network connection.
Wetting current may be enabled or disabled by the user. It is controlled by the placement of a jumper on
connector J2 on the card.
The feature is enabled by connecting pins 1 and 2 of the J2 connector with a jumper. It is disabled either
by removing the jumper or by connecting pins 2 and 3 of the J2 connector.
The card is shipped with the jumper connecting pins 2 and 3 on the J2 connector, which disables the
wetting current.
T1/FT1 DSU/CSU WIC LEDs and Loopback Button (continued)
Color Description
Yellow Remote station has an alarm condition.
Off Normal operation.
Green Internal DSU/CSU in the WIC is communicating with another
DSU/CSU. This LED is on during normal operation.
— Push this button to place the WIC into loopback mode. The service
provider can send a signal to test the connection from your site to
the central office switch.
Push this button again to turn off loopback mode.
Figure 60 shows the J2 connector and the jumper.
T1/FT1 DSU/CSU WAN Interface Card
OL-12845-01
5