David Clark U9120-W4 User manual

19605P-24 (07-20) 2020 DAVID CLARK COMPANY INCORPORATED
USER MANUAL
Digital Wireless Gateway
U9120-W4 (EU)
(P/N: 44002G-02)

19605P-24 (07-20)

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READ AND SAVE THESE INSTRUCTIONS. Follow the instructions in this installation
manual. These instructions must be followed to avoid damage to this product and
associated equipment. Product operation and reliability depends on proper usage.
DO NOT INSTALL ANY DAVID CLARK COMPANY PRODUCT THAT
APPEARS DAMAGED. Upon unpacking your David Clark product,
inspect the contents for shipping damage. If damage is apparent,
immediately file a claim with the carrier and notify your David Clark
product supplier.
ELECTRICAL HAZARD - Disconnect electrical power when making any
internal adjustments or repairs. All repairs should be performed by a
representative or authorized agent of the David Clark Company.
STATIC HAZARD - Static electricity can damage components.
Therefore, be sure to ground yourself before opening or installing
components.
LI-POLYMER - This product is used with Li-Polymer batteries. Do not
incinerate, disassemble, short circuit, or expose the battery to high
temperatures. Battery must be disposed of properly in accordance
with local regulations.

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Ov ve er rv vi ie ew w
The U9120-W4 (EU) (44002G-02) Digital Wireless Gateway is a fixed-mounted wireless
communication device that, when used in conjunction with the Digital Intercom System and one
or more U9100-series (EU) Wireless Belt Stations, becomes part of a digital wireless intercom
system. The U9120-W4 (EU) provides communication for up to four users and integrates with
the Digital Intercom System. Up to four belt stations can be connected to one gateway.
Figure 1: Overview of Gateway

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Intercom Interface
The U9120-W4 (EU) is designed to add wireless capability to the Digital Intercom System.
Mounting
Select a location on a flat surface that is out-of-the-way, and provides adequate room to attach
all cables. The U9104-W4 (EU) is immersion-proof (IP67). However where possible the mounting
location should be chosen to minimize direct exposure to the elements.
Position the endpoint on the surface to be mounted and mark the (2) hole locations.
Drill the (2) holes with 3/16-inch drill bit.
Mount the endpoint with #8 mounting screws and nuts/lock-washers (customer supplied).
Alternately, the U9104-W4 (EU) may be flush-mounted with the optional flush-mount kit
(M9110FM, 44004G-02) or the 44003G-01 gasket-mount kit.
Antenna
The U9120-W4 (EU) has an internal antenna. An external antenna may not be necessary but the
antenna connector is provided for either the included whip antenna or an optional remote
antenna kit (P/N: 40688G-93 for mag-mount, 40688G-96 for permanent install).
Choose an open, clear location for the remote antenna, away from other RF-emitting devices,
and route the coaxial cable away from any busy areas, preferably behind panels or in conduits.
This device has been designed to operate with the antennas listed below, and having a
maximum gain of 3 dB. Antennas not included in this list or having a gain greater than 3 dB are
strictly prohibited for use with this device. The required antenna impedance is 50 ohms.

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Acceptable antennas for use with this product:
Whip Antenna (P/N: 40688G-92)
Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
Remote Antenna Kit, Permanent (P/N: 40688G-96)
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Li in nk ki in ng g
Before a belt station and a gateway can be connected, they must first be linked. As a security
measure, the close-link feature requires devices to be in proximity of 1 to 3 ft (0.3 to 0.9m) in
order to successfully link. This ensures that the units are not inadvertently linked with other
units on the premises.
Linking procedure:
1. Ensure units are within 1 to 3 ft (0.3 to 0.9m) of each other.
2. Simultaneously (within 1-2 sec) press and release the LINK button on the U9120-W4 (EU)
and the LINK/PTT button on the belt station to link with.
3. Amber LED’s will flash on both devices. A momentary red LED indicates a successful
close-link.
4. Upon successful link the U9120-W4 (EU) will attempt to establish a connection with the
belt station.
5. Upon successfully establishing connection the LED on the gateway will flash a green
pattern corresponding to the number of belt stations connected.
Tip:
Once linked, the devices will not need to be linked again unless they are purged (see
Purging).
Each belt station is able to be linked to only one gateway at a time. A gateway can have up to
four belt stations linked/connected at one time.
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St ta at tu us s I In nd di ic ca at ti io on ns s
The front panel has a multi-color LED in the center which serves as a status indication for the
gateway. Table 1 below lists these states.

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Table 1: LED Status Indications
LED Color
Blink Rate
Status
Red
Solid
Initializing/power up
Red
Once
Connection Dropped
Red
Once
Connection Established
Orange
Slow
Idle/Disconnected
Orange
Fast
Link/Connection in Progress
Orange
Solid
PTT asserted
Green
Slow
Connected (pattern indicates
number of belt stations connected)
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Op pe er ra at ti io on n
Communication
Communication is defined by the Digital Intercom System and configured by the graphical user
interface. See the Digital Intercom System manual (19549P-31) for more information.
Range
The unimpeded line-of-sight range of a belt station and a gateway should be at least 500 ft
(150m). If you are in an environment with metal or concrete walls, this range could be reduced.
If the belt station enters into a "fringe" reception area, a brief sequence of three beeps will be
heard in the headset. This is to serve as a warning of a possible disconnection if conditions are
not improved. When possible, the user should attempt to regain line-of sight contact with the
gateway. When the belt station travels out of range of the gateway, a voice prompt will indicate
that the connection has been lost. To reconnect, simply move back into range and connection
with the gateway will automatically be reestablished, also noted by a voice prompt.
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Pu ur rg gi in ng g
In some circumstances it may be desired to “purge” the U9120-W4 (EU) of some of its linked belt
stations. Typically purging is not necessary unless there are multiple gateways in the same
vicinity and you wish to remove a belt station from this gateway and link to a different gateway.
A gateway can link up to four belt stations where a belt station can be linked to only one gateway
at a time.
Smart Purge
A smart purge is the purge method employed for the U9120-W4 (EU), in which only unwanted
links are removed from the gateway. When this procedure is complete, only belt stations that
are connected to the gateway remain linked. All other belt station links will have been removed
(see the belt station User Manual for the individual belt station purging procedure when
remaining link purging may be necessary.)

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Smart Purge procedure
1. Ensure the gateway is powered on and functioning.
2. Disconnect all belt stations to be purged (power off the belt stations).
3. Verify the number of green LED flashes on the gateway matches the number of
belt stations to be kept linked.
4. Press and hold LINK button on the gateway for 30 seconds until LED quickly
flashes red.
5. Release LINK button.
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Tr ro ou ub bl le es sh ho oo ot ti in ng g
Table 2: Troubleshooting
Problem
Solution
Gateway will not turn on
Check Cat5E cable and RJ-45 connectors
attached between gateway and Master
Station
Cannot link a belt station
Review Linking procedure
Ensure units are within 1 to 3ft (0.3 to 0.9m)
of each other while linking
Try a Smart Purge and attempt link again
Cannot speak over two-way radio
Belt Station PTT not pressed
Two-way radio not installed to system
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Re ep pl la ac ce em me en nt t P Pa ar rt ts s
Whip Antenna (P/N: 40688G-92)
Remote Antenna Kit, Mag-Mount (P/N: 40688G-93)
Remote Antenna Kit, Permanent (P/N: 40688G-96)
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The U9120-W4(EU) is not user serviceable. Do not attempt to open the enclosure. If this product
requires service, please contact the David Clark Customer Service department:
Phone: [phone]
E-Mail: [e-mail]
By Mail: Customer Service
David Clark Company
360 Franklin Street
Worcester, MA 01604

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When necessary, the U9120-W4 (EU) may be wiped down with a mild soap and water mixture.
Although it is a sealed device designed to withstand submersion in water to 1 meter, do not
unnecessarily submerse this product in water.
Avoid storage of this product in direct sunlight or high temperature environments.
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Frequency Range
1880 MHz - 1900 MHz (EU)
Average RF Power Output
10 mW (250 mW peak) (EU)
Range
500 ft (150m) line-of-sight (nominal)
Operating Temperature
-14°F to 131°F (-10°C to +55°C)
Storage Temperature
-4°F to 140°F (-20°C to +60°C)
Power Requirements
POE Power (802.3af)
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Changes or modifications not expressly approved by David Clark Company, Inc. could void the
users’ authority to operate the equipment.
Due to the DECT frequencies used, this product is licensed for operation only in the European
Union countries and those countries that have approved the DECT EU Standard.
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Sp pe ec ci if fi ic ca at ti io on ns s
Refer to the U9120-W4 (EU) Data Sheet (19549P-52) for specifications.
This product is protected by one or more of the following US patents:
10,237,415 10,389,884 10,397,408 10,560,825 10,701,211 10,701,212