Lucent Technologies SLC ConnectReach User & Service Manual page 304

Installation
Analog Voice Interface Considerations
Analog Voice Interface Considerations
FXS
On-premises loop
lengths of hookup
wire
Ringer equivalent
number (REN)
Minimum ringing
voltage
5-52 Issue 4 June 2002
The talk battery of the FXS interface is –25 V DC at 25 mA. Based on a typical
330-ohm telephone plus 150 ohms of loop resistance at 25 mA, the FXS interface
of the SLC ConnectReach system supports the following on-premises loop
lengths of hookup wire.
Loop Length (Feet)
2,850
1,750
Cadence ringing
For cadence ringing, the FXS interface of the SLC ConnectReach system
supports a ringer equivalent number (REN) of five per channel, with a maximum
of 75 REN per system.
Continuous ringing
For continuous ringing, the FXS interface of the SLC ConnectReach system
supports a REN of 1.5 per channel, with a maximum of 25 REN per system.
The minimum ringing voltage supplied by the FXS interface of the SLC
ConnectReach system is 42.5 V
AT&T Publication 43801 specifies that the AC ringing signal is to be
superimposed on the ring lead only, with the tip lead grounded. The SLC
ConnectReach system generates a balanced AC voltage between the tip and ring
leads. AT&T Publication 43801 also specifies that ringing on a ground-start line
may be tripped by either grounding the ring lead or going off-hook. However, a
ground-start device connected to the SLC ConnectReach system can only trip
ringing by going off-hook.
Wire Gauge (AWG)
24
26
at 20 Hz.
rms
363-208-050
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