Cisco Cisco 1900 2900 3900 Series 8-Port Gigabit Ethernet HS-WIC with PoE Installation Guide
Connecting Cisco DSU/CSU High-Speed WAN Interface Cards
T1/FT1 DSU/CSU HWICs
3
Cisco IOS Release 12.4(20)T
OL-14875-01
Note
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Enabling Wetting Current on T1/FT1 DSU/CSU HWICs
The HWIC-1DSU-T1 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 corrosion of
electrical contacts in the card’s network connection.
electrical current (60 to 140 milliamps) sent from the central office to the card to prevent corrosion of
electrical contacts in the card’s network connection.
Wetting current may be enabled or disabled by the user. It is controlled by a jumper on connector J2 on
the card.
the card.
shows the J2 connector and the jumper.
Figure 2
Jumper Settings for Controlling Wetting Current on the HWIC-1DSU-T1 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.
by removing the jumper or by connecting pins 2 and 3 of the J2 connector.
The card is shipped with the pins 2 and 3 connected, which disables the wetting current.
Prerequisites for Connecting a T1/FT1 DSU/CSU HWIC to a Network
Before connecting an HWIC to the network, ensure that the HWIC is installed in the router, the
equipment is properly grounded, and you have the proper cables for connecting the HWIC to the
network. This section describes the preparation necessary for connecting a T1/FT1 DSU/CSU HWIC to
the network.
equipment is properly grounded, and you have the proper cables for connecting the HWIC to the
network. This section describes the preparation necessary for connecting a T1/FT1 DSU/CSU HWIC to
the network.
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Wetting current
disabled
Wetting current
jumper
J2
J2
Wetting current
enabled
J2