Hardware Installation Manual 5. Cabling the Device
Media Gateways & SBCs 45 Mediant 1000B Gateway & E-SBC
5.3.1.2 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 3.2.1 on page 17.
Warnings:
• 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”.
• 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!
• 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.
• 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.
• 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.
• 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).
• The device complies with protection levels as required by EN 55024/EN 300386.
Higher levels of surges may cause damage to the unit.
Cabling specifications:
Cable: Standard straight-through RJ-11-to-RJ-11 telephone cable
Connector: RJ-11
Connector Pinouts:
Figure 5-7: RJ-11 Connector Pinouts for FXS
To connect FXS interfaces for outdoor routing:
1. Ground the device as described in Section 5.1 on page 39 and shown in Figure 5-8.
2. Connect one end of a straight-through RJ-11 cable to the RJ-11 port on the outdoor
FXS module.
3. Connect the other end of the cable to your MDF.
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