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Page 31 / 44 Scroll up to view Page 26 - 30
Patterns: Normal Operation (WAN and Battery)
The following table shows light patterns during normal operation.
Mode
Power
US/DS
Online
Battery
AC Power
Good
On
On
=
Connected
to the
Internet
Flash
= Not
connected
to the
Internet
On
=
Internet
available
Off =
Internet
not
available
On
=
Battery
good or low
Off
=
Battery
missing
Flash
=
Battery bad
No AC
Power Bat-
tery In-
stalled
Flash
Off
Off
Off =
Battery
power
Flash
=
Battery bad
No AC
Power No
Battery
Off
Off
Off
Off
Firmware
Upgrade
On
Flash
On
(normal
operation)
Xfinity TG1682 Telephony Gateway User’s Guide
Safety
Getting
Started
Battery
Installation
Installation
Ethernet
Configuration
Usage
Troubleshooting
Glossary
31
Page 32 / 44
32
Safety
Getting
Started
Battery
Installation
Installation
Ethernet
Configuration
Usage
Troubleshooting
Glossary
Xfinity TG1682 Telephony Gateway User’s Guide
Patterns: Startup Sequence
The following table shows the Telephony Gateway light patterns during each phase
of the startup sequence. There are two phases of startup; the Telephony phase and
the cable modem phase. Both are outlined below.
Note
:
The
US/DS
indicator flashes during startup, and turns on when the Tele-
phony Gateway establishes a connection.
Power,
US/DS,
Online
Telephone
Battery
Description
1
2
Off
Off
Off
Off
No power to Modem
Flash
Flash
Flash
Flash
Power-on Self Test
“Cable Modem Start Up Sequence”
Begins
On
Flash
Off
Off
Retrieving telephone net-
work information
On
Off
Flash
Off
Retrieving telephone line
information
On
Flash
Flash
Off
Activating telephone
service
Normal Operation Begins
Page 33 / 44
Cable Modem Start Up Sequence
US/DS
Online
Description
Slow
Flash
(1/second)
Off
Downstream acqusition in progress
On
(until Upstream
acqusition
starts)
Off
Downstream acquisition completed
Fast
Flash
(3/second)
Off
Upstream acquisition completed
On
Slow
Flash
(during acqusition)
On
(when modem IP
address obtained)
Upstream acqusition completed,
ready for service
Xfinity TG1682 Telephony Gateway User’s Guide
Safety
Getting
Started
Battery
Installation
Installation
Ethernet
Configuration
Usage
Troubleshooting
Glossary
33
Page 34 / 44
Using the Reset Button
Use the
Reset
button, on the back of the Telephony Gateway, to reset the modem
and perform initialization as if you power cycled the unit. You may need to reset the
Telephony Gateway if you are having problems connecting to the Internet. Using
this button will be rare.
Use a pointed
non-metallic
object to press this button. The photo to the left shows
the location of the
Reset
button. The
Reset
button is recessed to prevent acci-
dental resets.
The diagram on the left shows the location of the reset button.
Resetting the Router to Factory Defaults
To reset the router to factory defaults, press and hold the
Reset
but ton on the back
of the Telephony Gateway for more than fifteen seconds. This restores the wireless
setup configuration and router configuration parameters to the factory defaults. You
may need to do this if a misconfiguration has locked out all access.
Booting from Battery
The TG1682 supports a “Boot from Battery” feature that allows the Telephony Gate-
way to provide voice service without AC power.
To start the TG1682 from its battery, follow these steps:
1
If a battery is already installed in the Telephony Gateway, remove it.
2
Re-insert the battery into the Telephony Gateway (see
Battery Installation
and Removal
for details).
3
Press the
Reset
button; the Power light should turn on immediately.
Xfinity TG1682 Telephony Gateway User’s Guide
Safety
Getting
Started
Battery
Installation
Installation
Ethernet
Configuration
Usage
Troubleshooting
Glossary
34
Reset
USB
Tel
Tel 1
Alarm/Tel2
1
2
3
4
Ethernet
Cable
Power
Reset
Button
Page 35 / 44
Troubleshooting
The Telephony Gateway is plugged in, but the Power light is off.
Check all power connections. Is the power cord plugged in firmly at both
ends?
If you plugged the power cord into a power strip, make sure the strip is
switched on.
Avoid using an outlet controlled by a wall switch, if possible.
Finally, check the fuse or circuit breaker panel.
I’m not getting on the Internet (all connections).
It may take over 30 minutes to establish a connection the first time you
power up your Telephony Gateway, especially when many people are online.
Always leave your Telephony Gateway plugged into AC power and connected
to the cable system.
Check the front panel lights:
•
The
Power
and
Online
lights should be on.
•
If the
Power
light blinks for more than 30 minutes, call your cable
company for assistance.
Check your cable connections. Connectors should be tight. The
coax cable
should not be pinched, kinked, or bent sharply—any of these can cause a
break or short in the cable (you may have to replace the cable). If you have
one or more splitters between the Telephony Gateway and CATV outlet, re-
move the splitters and connect the Telephony Gateway directly to the out-
let.
Proceed to the Ethernet or wireless solutions (next page) if necessary.
Xfinity TG1682 Telephony Gateway User’s Guide
Safety
Getting
Started
Battery
Installation
Installation
Ethernet
Configuration
Usage
Troubleshooting
Glossary
35

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