
Description
FXS (Foreign Exchange Station) gateways and ATA (Analog Telephone Adapter) devices have specific port limitations that can vary based on design and intended use. Here’s a brief overview of short and long-haul ring load limitations:
Short Haul vs. Long Haul
- Short Haul:
- Typically refers to distances below 1,000 feet (300 meters).
- Supports standard ringing loads (usually around 20 Hz for ringing tones).
- Long Haul:
- Involves distances over 1,000 feet (300 meters).
- May experience signal degradation, which can affect ringing tones and call quality.
FAQs
What is the maximum number of devices that can be daisy-chained from a single FXS port on a Grandstream ATA?
The maximum number of devices that can be connected depends on the REN (Ringer Equivalence Number) usage. For instance, the Grandstream ATA HT801 supports up to 5 REN. If an analog phone requires 2 REN, you can connect up to 2 phones to the HT801. Typically, analog phones have a REN usage ranging from 0.5 to 2, so the total number of devices will vary based on the specific models being connected.

The GXW42XX datasheet states it supports “2 REN, up to 6000 ft on 24 AWG wire.” Is this measurement for one way or a complete loop?
It is a one-way measurement – 6000 feet (1.8km) is the distance of RJ11 Cable between GXW42XX andĀ RENĀ Board.
