Cisco Cisco Catalyst 6000 Multilayer Switch Feature Card MSFC2 Guide De Montage

The 8-port analog voice/fax expansion module (EM-HDA-8FXS and EM3-HDA-8FXS) adds an 
additional eight FXS ports to the Cisco high-density extension module.

When router power is off, connect an analog phone to the FXO line to make a call. (See the 

 for more information).

If you have specified the use of a private line automatic ringdown (PLAR) off-premises extension (OPX) 
connection mode for an  FXO voice port (with loop resistance less than 8000 Ohm), you must ensure 
that the soft-offhook option is enabled on the port.

This option allows a stepped offhook resistance during seizure which avoids overloading the circuit 
during offhook in the event that ringing voltage is present on the circuit at the same time as the trunk 
seizure. The stepped offhook resistance is initially set to 800 Ohms, then adjusts to 50 Ohms when 
ringing voltage is not present.

To enable soft-offhook command on the port, and to access the connection command with plar opx 
syntax, see the 

Expansion modules can be used to increase the number of ports supported on the high-density extension 
module. 

ESD straps should be worn when handling all modules, including during installation of expansion 
modules. An ESD wrist strap is shipped with the product.

To install expansion modules, follow these steps:

Decide if the expansion board is going in the EM0 slot or EM1 slot.

The EM0 slot is on the left, and the EM1 slot is on the right as you look at the face plate.

Align the connectors on the underside of the expansion module with the connectors for the slot you plan 
to use on the network module. (See 

Using gentle pressure, insert the connectors on the underside of the expansion module into the 
connectors on the network module.

Use the alignment pins on the network module brackets to guide the expansion module during 
installation.