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Page 21 / 106 Scroll up to view Page 16 - 20
4021192 Rev B
21
Where Is the Best Location for My DOCSIS Residential Gateway?
Where Is the Best Location for My DOCSIS Residential
Gateway?
The ideal location for your residential gateway is where it has access to outlets and
other devices. Think about the layout of your home or office, and consult with your
service provider to select the best location for your residential gateway. Read this
user guide thoroughly before you decide where to place your residential gateway.
Consider these recommendations:
Choose a location close to your computer if you will also use the residential
gateway for high-speed Internet service.
Choose a location that is near an existing RF coaxial connection to eliminate the
need for an additional RF coaxial outlet.
Choose a location for the residential gateway that is adjacent to your telephone
equipment if you are using only one or two pieces of telephone equipment.
Note:
If you are using the residential gateway to provide service to several
telephones, a professional installer can connect the residential gateway to your
existing home telephone wiring. To minimize changes to the home telephone
wiring, you may want to locate the residential gateway near an existing
telephone outlet.
Choose a location that is relatively protected from accidental disturbance or
harm, such as a closet, basement, or other protected area.
Choose a location so that there is plenty of room to guide the cables away from
the modem without straining or crimping them.
Airflow around the residential gateway should not be restricted.
Read this user guide thoroughly before installing the residential gateway.
Page 22 / 106
22
4021192 Rev B
How Do I Mount the Modem on a Wall? (Optional)
How Do I Mount the Modem on a Wall? (Optional)
You can mount the residential gateway on a wall using two wall anchors, two
screws, and the mounting slots located on the unit. The modem can be mounted
vertically or horizontally.
Before You Begin
Before you begin, choose an appropriate mounting place. The wall can be made of
cement, wood, or drywall. The mounting location should be free of obstructions on
all sides, and the cables should be able to easily reach the residential gateway
without strain. Leave sufficient clearance between the bottom of the residential
gateway and any flooring or shelving underneath to allow access to cabling. In
addition, leave enough slack in all cables so that the residential gateway can be
removed for any required maintenance without disconnecting the cables. Also,
verify that you have the following items:
Two wall anchors for #8 x 1-inch screws
Two #8 x 1-inch pan head sheet metal screws
Drill with a 3/16-in. wood or masonry bit, as appropriate for the wall
composition
A copy of the wall-mounting illustrations shown on the following pages
Mount the modem as shown in one of the following illustrations.
Page 23 / 106
4021192 Rev B
23
How Do I Mount the Modem on a Wall? (Optional)
Location and Dimensions of the Wall-Mounting Slots
The following illustration shows the location and dimensions of the wall-mounting
slots on the bottom of the modem. Use the information on this page as a guide for
mounting your modem to the wall.
Page 24 / 106
24
4021192 Rev B
How Do I Mount the Modem on a Wall? (Optional)
Mounting the Residential Gateway on a Wall
1
Using a drill with a 3/16-inch bit, drill two holes at the same height and 4 inches
apart.
Note:
The preceding graphic illustrates the location of the mounting holes on the
back of the residential gateway.
2
Are you mounting the residential gateway into a drywall or concrete surface
where a wooden stud is available?
If
yes
, go to step 3.
If
no
, drive the anchor bolts into the wall, and install the mounting screws
into the anchor bolts; leave a gap of about 1/4-inch between the screw head
and the wall. Then, go to step 4.
3
Install the mounting screws into the wall; leave a gap of about 1/4-inch between
the screw head and the wall. Then, go to step 4.
4
Verify that no cables or wires are connected to the residential gateway.
5
Lift the residential gateway into position. Slip the large end of both mounting
slots (located in the back of the residential gateway) over the mounting screws,
and then slide the residential gateway down until the narrow end of the keyhole
slot contacts the screw shaft.
Important:
Verify that the mounting screws securely support the residential
gateway before you release the unit.
Page 25 / 106
4021192 Rev B
25
What Are the Requirements for Telephone Service?
What Are the Requirements for Telephone Service?
Number of Telephone Devices
The RJ-11 telephone-style connectors on the residential gateway can each provide
telephone service to multiple telephones, fax machines, and analog modems.
The maximum number of telephone devices connected to each RJ-11 port is limited
by the total Ringing Load of the telephone devices that are connected. Many
telephone devices are marked with a Ringer Equivalent Number (REN). Each
telephone port on the residential gateway can support up to a 5 REN load.
The sum of the REN load on all of the telephone devices attached to each port must
not exceed 5 REN.
Telephone Device Types
You can use telephone devices that are not labeled with a REN number, but the
maximum number of attached telephone devices cannot be accurately calculated.
With telephone devices that are not labeled, each device should be connected and
the ring signal should be tested before adding more devices. If too many telephone
devices are attached and the ring signal can no longer be heard, telephone devices
should be removed until the ring signal works properly.
Telephones, fax machines, and other telephone devices should use the center 2 pins
of the RJ-11 connectors to connect to the residential gateway telephone ports. Some
telephones use other pins on the RJ-11 connectors and require adapters in order to
work.
Dialing Requirements
All your telephones should be set to use DTMF dialing. Pulse dialing is typically not
enabled by your local provider.
Telephone Wiring Requirements
The residential gateway supports connecting to the interior telephone wiring as well
as connecting directly to a telephone or fax machine. The maximum distance from
the unit to the most distant telephone device must not exceed 1000 feet (300 meters).
Use 26-gauge twisted-pair, or larger, telephone wiring.
Important:
Connection to an existing or a new permanently installed home
telephone wiring network must be done by a qualified installer.

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