Chapter 2 Installation
BU 802 Battery Backup Unit Installation
2-16
TA 102/202 Technical Support Guide
BU 802 Battery Backup Unit Installation
A telephone subscriber in a PSTN (Public Switched Telephone Network) typically will
still have phone service when the main AC power fails. That’s because the phone
company uses a battery backup system to keep the phones operational during a power
failure. On the other hand, a phone subscriber in an HFC PacketCable network will
loose phone service during a power outage—unless he or she operates their cable
modem/MTA from a battery backup unit.
To keep a TA-102/202 eMTA operational during a local AC power failure, Terayon pro-
vides the BU 802 Battery Backup Unit. As a battery backup unit the BU 802 senses an
AC power loss and automatically switches to battery power so the TA-102/202 eMTA
remains operational during an AC power outage. When AC power is restored, battery
power is switched out and the Power Adapter provides DC power for the TA-102/202
eMTA.
Figure 2-10 BU 802 Battery Backup Unit
BU 802 units can hold two lithium battery packs. Each battery pack can power the TA-
102/202 eMTA for 2 or 4 hours, depending on the type. However to accommodate cus-
tomer preferences, the BU 802 can have up to five battery configurations. Figure 2-11
below illustrates those five battery configurations
BU 802 BATTERY BACKUP UNIT
REAR VIEW
BU 802 BATTERY BACKUP UNIT
FRONT VIEW
DC VOLTAGE
OUTPUT CABLE
(To MTA DC Input Jack)
DC INPUT JACK
(From Power Adapter)
DC INPUT JACK
(From Power Adapter)
BATTERY
STATUS
LED
BACKPLATE
