Outdoor FXS Cabling
The following procedure describes how to cable FXS ports for outdoor routing. This is applicable only when the FXS modules supporting outdoor cabling are used, as described in Section FXS Module .
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The device must be installed only in telecommunication sites / centers in compliance with ETS 300-253 requirements “Earthing and Bonding of Telecommunication Equipment in Telecommunication Centers”. |
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Prior to installation, earth loop impedance test must be performed by a certified electrician to ensure grounding suitability at the power outlet intended to feed the unit. It is essential that the impedance will be kept below 0.5 ohms! |
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Proper grounding is crucial to ensure the effectiveness of the lightning protection, connect the unit permanently to ground as per the illustration in this section. |
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The device includes an integrated secondary surge protection, but does not include primary telecom protection. Where the telephone lines are routed outside the building, it is essential to install additional three-electrode Gas Discharge Tube (GDT) rated 350V as a primary protection on the MDF, located at the entrance point of telephone wiring to the building. The center pin of the GDT must be connected to ground as per the illustration in this section. |
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Failing to install primary surge protectors, and failing to comply with the grounding instructions or any other installation instructions, may cause permanent damage to the device. |
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As most of the installation is the responsibility of the customer, AudioCodes can assume responsibility for damage only if the customer can establish that the device does not comply with the standards specified above (and the device is within the hardware warranty period). |
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The device complies with protection levels as required by EN 55035 / EN 300386. Higher levels of surges may cause damage to the unit. |
Cabling specifications:
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Cable: Standard straight-through RJ-11-to-RJ-11 telephone cable |
RJ-11 Connector Pinouts for FXS
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To connect FXS interfaces for outdoor routing: |
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Connect one end of a straight-through RJ-11 cable to the RJ-11 port on the outdoor FXS module. |
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Connect the other end of the cable to your MDF. |
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Provide primary surge protection, by installing additional three-electrode Gas Discharge Tube (GDT) rated 350V as a primary protection on the MDF, located at the entrance point of telephone wiring to the building. The center pin of the GDT must be connected to ground as shown in the following figure: |
FXS Cabling for Outdoor Routing
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Connect the telephone line from the MDF to your analog equipment. |