4000 Router Series Interface Module Guide

Attribute Description

Number of connectors

4 FXS interfaces

1 FXO interface

Interface standard

• Supports subscriber circuit interface (FXS), compliant with ITU Q.512

• Supports loop trunk interface (FXO), compliant with ITU Q.552

• Over-current and over-voltage protection compliant with ITU K.20

Cable type Telephone cable with ferrite core

Dial-up mode Supports DTMF, compliant with GB3378, but does not support pulse dial-up.

Bandwidth 300 Hz to 3400 Hz

Interface LEDs

The following table shows the DSIC-4FXS1FXO panel.

Figure 24 DSIC-4FXS1FXO panel

The following table describes the LEDs on the DSIC-4FXS1FXO panel.

Table 37 Description for the LEDs on the DSIC-4FXS1FXO panel

LED Descri

tion

LINK/ACT

• OFF means the link is idle.

• ON (Green) means the link is being occupied for call connection.

• Flashing (Yellow) means the link is being occupied for communication.

Interface cables and the connection methods

For more information about FXS/FXO interface cables and the connection methods, see

"ADSL/BS/FXS/FXO/AM/FCM interface."

SIC-1BSV/SIC-2BSV

Introduction

SIC-2BSV is short for 2-port ISDN BRI S/T voice interface module, which is mainly used to process

(receive/transmit and compress/decompress) the ISDN interface voice traffic. The interface(s) on the

SIC-2BSV module is (are) ITU-T I.430-compliant, adopting pseudo-ternary coding, providing 192 Kbps

interface rate, and allowing the maximum transmission distance of 1 km (0.6 mi.) in point-to-point mode.

In the upstream direction, the SIC-2BSV module can be connected to a user interface on an ISDN switch

to receive and decompress, compress and transmit ISDN BRI digital voice traffic. In the downstream

direction, the module can be connected to a TE device to forward the voice packets from the TE device

to the Internet through a WAN interface on the router, thus implementing VoIP. The module has the

following features.

• A BSV interface supports two modes: user and network, respectively for connecting an ISDN

network and a TE device.