Using The Telephony Modem; About Backup Batteries; About The Backup Battery (Tm402P/Tm402Q) - Arris Touchstone TM402 Installation Manual

Using the Telephony Modem

This chapter describes the controls and features available on the Model 4
Touchstone Telephony Modems, and covers basic troubleshooting procedures.

About Backup Batteries

The Telephony Modem is designed so that you can replace the battery pack in
a wall-mounted modem without disconnecting AC power or removing the
modem from the wall.
The rated storage temperature for Li-Ion batteries is -20°C to +60°C; (-4°F to
140°F); extended storage at temperatures above 25°C (77°F) results in reduced
battery life and is not recommended.
The following factors can affect hold-up times:
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About the Backup Battery (TM402P/TM402Q)

The TM402P and TM402Q Telephony Modems use one or two Li-Ion battery
packs. See "Replacing a Backup Battery Pack (TM402P and TM402Q
models)" on page 4-8 for replacement instructions.
Table 4-1
Nominal Battery Powering (TM402P and TM402Q models only)
One Battery Pack
Installed
10 Hours
6 Hours
The age and temperature of the battery pack - hold-up times will decrease
with increasing battery age and at higher temperatures.
Battery charge level when AC power is lost.
Activity level of the Telephony Modem - data transfer, additional lines
off-hook, boosted loop current (40mA), continuous ringing, etc. can
reduce the hold-up time.
Two Battery Packs
Installed
20 Hours
12 Hours
Telephony Modem Installation Guide Release 4 Standard 3.0 Aug 2004
Telephony Modem Operating Mode
Idle (all lines on-hook, no data)
1 Line Off-Hook (non-boosted, no data)
4-1
4-