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Cisco VG350 Voice Gateway Hardware Installation Guide
OL-25970-01
Chapter 3 Planning Your Installation
Distance Limitations for Interface Cables
Cable Types
The cable types that are used are dependent on the Cisco VG350 Voice Gateway that you are using. For
more information, see the “Interfaces and Service Capabilities” section on page 1-3 and “Cable
Specifications and Information” section on page A-1.
• GE cables (RJ-45 to RJ-45 straight-through cables)
• Analog voice cables (RJ-21)
Distance Limitations for Interface Cables
When planning your installation, consider distance limitations and potential electromagnetic
interference (EMI) as defined by the Electronic Industries Association (EIA). Distance limitation
information is included for the following VG ports:
• Gigabit Ethernet Maximum Distance, page 3-4
• FXS Analog Voice Port Maximum Distance, page 3-4
• FXS-E (Extended loop) Analog Voice Port Maximum Distance, page 3-4
Gigabit Ethernet Maximum Distance
The maximum segment distance for Gigabit Ethernet is 330 feet (100 meters) (specified in IEEE 802.3).
FXS Analog Voice Port Maximum Distance
The maximum distance is established by a total allowable loop resistance, including the phone or
terminal equipment, of 600 ohms.
FXS-E (Extended loop) Analog Voice Port Maximum Distance
The maximum distance is established by a total allowable loop resistance, including the phone or
terminal equipment, of 1400 ohms.
Note Typically, a 26 AWG wire is equal to 81.6 ohm/Kft and 24 AWG wire is equal to 51.3 ohm/Kft.