Cisco OL-12812-01 User Manual download pdf (Page 11)

Connecting Cisco Voice Network Modules to the Network

IP Communications High-Density Digital Voice or Fax Network Module

Connecting Cisco Voice Network Modules to the Network

• VWIC-1MFT-G703

• VWIC-2MFT-G703

When used with PVDM2 modules and next-generation analog or BRI voice interface cards (VIC2), the

NM-HDV2 network module provides the interface to telephony equipment (PBX, key systems,

telephones, and fax machines) and to the PSTN. The following VICs are supported:

• VIC-2DID

• VIC-1J1

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

• VIC2-2FXO

• VIC2-4FXO

• VIC2-2FXS

• VIC2-2E/M

• 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.

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Cisco OL-12812-01 User Manual Page 11