H3C Technologies H3C MSR 50 - Manual (Page 267)

4-72
Because the 2E&M and 4E&M modules cannot determine the interface types (Bell I/II/III/V), cable types
(2-wire or 4-wire), and pinouts (E/M/Tx/Rx) of the peer switch, you must prepare the interface cables of
the 2E&M and 4E&M modules according to the on-site conditions. To ensure the EMC of the router,
install a ferrite core near the connector of the E&M module interface cable at the router side.
Connecting the interface cable
z
If outdoor cabling is involved, consider to install a special lightning arrester at the input end of the
interface cable for better lightning protection.
z
Before you connect a port, read its label carefully; a wrong connection can cause damages to the
interface module and even the device.
z
According to Bell V, cables for FXS/FXO/E&M modules do not provide a PGND wire. For this
reason, a loop should be formed through the earth ground between the router and the connected
switch. In practice, the PGND wire of the switch can be connected to the chassis of the router.
z
In connecting an interface cable, note to connect the end with ferrite core to the router for EMC
sake.
Step1 Insert the ferrite core end of the cable into the to-be-connected RJ-45 port on the interface module.
Step2 Connect the other end of the cable as follows:
z
For a FIC-FXS module, connect to a phone-set, fax or AT0 loop trunk of telephone exchange.
z
For a FIC-FXS, connect to a regular subscriber line of telephone exchange.
z
For an E&M module, connect to an E&M trunk on the telephone exchange.
FIC-24FXS
Introduction
The 24-port voice subscriber circuit interface module (FIC-24FXS) processes and transmits voice
signals over data communications networks for 24 regular analog phones, faxes, or AT0 loop trunks of
telephone exchanges.
Interface attributes
Table 4-59 Interface attributes of the FIC-24FXS module
Attribute Description
Connector 50-pin D-type female connector
Interface standard FXS interface
Interface rate 24 × FXS interface rate