Cisco Systems OL-12812-01 manual Configuring E1 Ports for Normal or Wetting Current Mode

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Connecting Cisco Voice Network Modules to the Network

IP Communications High-Density Digital Voice or Fax Network Module

VIC-4FXS/DID (DID feature not supported)

VIC2-2FXO

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VIC2-2BRI-NT/TE

Configuring E1 Ports for Normal or Wetting Current Mode

On the NM-HDV2-1T1/E1 and NM-HDV2-2T1/E1 network modules there is a jumper block for each built-in T1/E1 port that controls whether the port supports normal or wetting current mode. 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 module’s network connection. Depending on how your E1 line is provisioned, you might have to change the jumper setting on the network module to allow proper operation.

The jumper blocks are identified on the printed circuit board of the NM-HDV2-1T1/E1 and NM-HDV2-2T1/E1 network modules as J6 and J7. (See Figure 16.) J6 is the jumper block for T1/E1 controller 1 and J7 is the jumper block for T1/E1 controller 0. The pins on each jumper block are numbered 1 to 3 from right to left.

To configure an E1 port for normal mode, set the jumper to pins 2 and 3.

To configure an E1 port for wetting current mode, set the jumper to pins 1 and 2.

Figure 16 shows the jumper block configured for normal mode, with the jumper set to pins 2 and 3.

Tip If you are unsure whether your E1 line is configured for normal or wetting current mode, check with your provider. You can also use the show controllers E1 command to look for line code violations and path code violations. These errors can indicate that the jumper is not set correctly.

Connecting Cisco Voice Network Modules to the Network

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Contents Voice Network Modules Connecting Cisco Voice Network Modules to the Network48-Channel High-Density Voice Network Modules 4-Channel Voice Network ModulesChannel High-Density Voice Network Module Packet Voice DSP Modules Pvdm Orientation Pvdm OrientationRemoving PVDMs Installing PVDMsView from front of board Voice Network Module LEDsVoice Network Module LED HDV Network Module LEDsNM-HDV2 Packet Fax or Voice DSP ModulesVIC-2DID Configuring E1 Ports for Normal or Wetting Current Mode NM-HDV2-2T1/E1 Jumpers Configured for Normal Mode Installing PVDM2 ModulesPVDM2 Module Slot Locations PVDM2 Module OrientationRemoving PVDM2 Modules Installing PVDM2 ModulesNM-HDV2 Network Module LEDs Installing PVDM2 ModulesNM-HDV2 Network Module LEDs Related DocumentsConnecting Cisco Voice Network Modules to the Network