Arris TM02AA104, Installation Manual

Page: 36 / 52

4-2 Using the Telephony Modem
Touchstone ARSVD00770 Release 4 Standard 3.0 Aug 2004
About the Backup Battery (TM402G/TM402H)
The TM402G and TM402H Telephony Modems use a single Li-Ion battery
pack. See “Replacing a Backup Battery Pack (TM402G and TM402H
models)” on page 4-10 for replacement instructions.
A fully-charged battery pack will typically power the Telephony Modem for
the durations shown (or longer) in the table below:
Battery Charging
When the Telephony Modem is powered up, whether for the first time or after
replacing a battery, it will begin charging the battery pack. If two battery packs
are installed (TM402P and TM402Q models only), they will be charged
sequentially (as opposed to simultaneously). The pack will be fully charged in
less than 18 hours (less than 36 hours for two packs).
Battery Capacity Test
In order to assess whether the battery needs to be replaced, the Telephony
Modem will periodically perform a capacity test. During the capacity test, the
battery pack is partially discharged. This discharge period will last less than 11
hours. Following the discharge period, the Telephony Modem will fully
recharge the battery pack (see Battery Charging).
When two battery packs are present (TM402P and TM402Q models only), the
Telephony Modem will not begin discharging the second pack until the first
pack has been discharged and fully recharged. This ensures there will always
be at least one fully charged battery pack through-out the test cycle.
The default setting for the capacity test scheduling is within 4 days of initial
power on and every 180 days afterwards. However, the scheduling of this test
may be ‘paused’ and ‘accelerated’ through provisioning.
Light Emitting Diode (LED) Display
The Touchstone

Telephony Modem comes equipped with the following
LED indicators:
• Power - indicates whether AC power is available to the unit.
• DS - indicates downstream connectivity from the headend to the
Telephony Modem.
Table 4-2
Nominal Battery Powering (TM402G and TM402H models only)
Backup Time with
Battery Pack Telephony Modem Operating Mode
5 Hours Idle (all lines on-hook, no data)
3 Hours 1 Line Off-Hook (non-boosted, no data)