
1/5/2007
EAG Gateway Series Administration Guidelines
MAG-06007 Rev. A
2.4 FXS/FXO Mixed Line Interface Module
Figure 6. 8S/8 Line Interface Module Physical View
The FXS/FXO mixed line module provides an ideal solution for enterprise and personal users to
expand their existing PSTN or PBX telecommunication systems by connecting to IP network. It offers
flexible configuration and routing capabilities to meet the different customer requirements.
The FXS/FXO mixed line module offers both the FXS and FXO interfaces on the same line card.
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It provides the analog interfaces to connect to telephones, faxes, modems, and PBX.
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It provides the analog relay ports. It can be connected to PBX analog POTS lines or telephony
switch POTS lines.
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The FXO ports can be used for Life-line PSTN Fallback to increase the system stability and
reliability.
The examples are given as follows based on the 4FXS/4FXO mixed line interface module.
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EAG with the 4S/4 has three interface types: IP, FXS, and FXO. The calls from any interface type
can be routed to any of the two other interface types.
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EAG with the 4S/4 is equivalent to an IP-PBX. It offers the common PBX functions as well as the
IP functions.
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EAG with the 4S/4 can be used as EAG with 4FXS or EAG with 4FXO.
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All the Essence’s VOIP gateways with the FXS/FXO line card provide the same functions and
features. The gateways include EAG and EIG.
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Applicable scenarios include the connections of enterprise PBXs, the connections of PBX and
VOIP, or used as IP-PBX.
Currently there are two configurations for the FXS/FXO mixed line card modules:
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