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Modem Lets SecureLinc Wireless Security System Dial Out on a Cellular Network
Visonic GSM Modem for Web-Enabled Security Kits
Visonic GSM Modem for Web-Enabled Security Kits
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GSM Modem for Web-Enabled Security Kits GSM Modem for Web-Enabled Security Kits GSM Modem for Web-Enabled Security Kits
GSM Modem for Web-Enabled Security Kits
Visonic GSM Modem for Web-Enabled Security Kits
Item# 73903G
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  • Modem allows security system communication over cellular network
  • GSM Modem serves as a telephone line backup or as the only phone channel
  • AC-powered modem also comes with battery pack for backup power

Essential Info

A convenient feature of the Smarthome SecureLinc Home Security System is that in the event of a breach, it can seize your phone line to dial out for help. You can double your peace of mind by knowing that even if phone lines are down, your security system is still able to call you. Install the GSM Modem for Web-Enabled Security Kits, and your SecureLinc will be able to use a cellular line to dial out as a backup to your standard telephone line. For the many homes that no longer maintain a landline, the GSM Modem for Web-Enabled Security Kits allows operation over a cellular network instead of a telephone network. Just get a SIM card from your cell service provider. The SecureLinc is sold separately.


What's Included

  • GSM modem
  • Power supply
  • Mounting materials
  • Mounting bracket
  • Backup battery pack
  • Cat. 5e cable
  • Pin-to-pin connector
  • Instructions
  • More Info

    Receive Notification for Alarms or Non-Alarm Events
    Program your SecureLinc to call you at any private phone number using the GSM Modem, and you'll receive a pre-recorded message in your own voice in the event of an alert. The SecureLinc also supports 24-hour monitoring by commercial alarm monitoring personnel, who can dispatch police, fire or medical response (depending on the type of alert received). You can even set up the system to call you for non-alarm events. For example, want to know that your kids arrived home safely from school? The system can call you at the office to let you know that your child successfully disarmed the alarm.

    Dial In to Activate Security or Automation Systems
    With a cellular or standard telephone line connected to your SecureLinc wireless security system, you'll be able to call in to activate any connected home appliances or to monitor your system. You can even arm the system over the phone.

    Dual Reporting Protection
    The GSM Modem and the SecureLinc periodically check the connection between them. When this connection is lost, both report a tamper alarm. If either unit is tampered with, the other unit reports the event. This dual reporting protection feature provides double the security for double the peace of mind.



    Visonic Product No.:GSM
    Dimensions:7 3/8" L x 4 1/4" W x 1 3/4" D (18.5cm L x 10.8cm W x 4.3cm D)
    Weight:17.6 oz. (500g)
    Frequency:USA: 850/1900 MHz; Europe: 900/1800 MHz
    Power Supply:Indoor plug-in transformer, 120 VAC, 60 Hz / 9 VAC, 1A (in U.S.A.), or 230 VAC, 50 Hz / 9 VAC, 1A
    Current Consumption:40mA approx. (idle), < 400mA (transmission)
    Backup Battery:Ni-Metal, 7.2V, 1300mAh
    Backup Battery Life:Up to 24 operation hours in receive mode
    Initial Battery Charge Time:< 48 hours with GSM Transformer
    Distance Between GSM Unit and SecureLinc:3.2' to 40' (1m to 12m)
    Operating Temperature:32° F to 120° F (0° C to 49° C)
    Approvals:FCC, GSM, EMC, EN, CE compliant
    Warranty:1 year, limited

    Important notes:
    Only merchandise credit for defective items returned within 30 days of purchase. No other returns allowed on this item.
    Manufacturer contact information: Visonic Inc, Tel: (860) 243-0833


    GSM Modem for Web-Enabled Security Kits  GSM Modem for Web-Enabled Security Kits  GSM Modem for Web-Enabled Security Kits  GSM Modem for Web-Enabled Security Kits 
    GSM Modem for Web-Enabled Security Kits  GSM Modem for Web-Enabled Security Kits  GSM Modem for Web-Enabled Security Kits  GSM Modem for Web-Enabled Security Kits 


    18 Ratings
    5 star: 44%  (8)
    4 star: 22%  (4)
    3 star: 11%  (2)
    2 star: 0%  (0)
    1 star: 22%  (4)
    Average Customer Rating
    (18 customer ratings)
    Share your thoughts with other customers
    KENNETH -- saint paul, MN   2/14/2011
    Not sure if it's the unit itself or my cell service, but the RSSI signal is somewhat inconsistent. Seems to range from below acceptable (trouble alert) to as high as 84%. I also thought all of the commands that work on a landline, would work on cell service only... Cannot open one-way or two-way communication from a remote phone (landline or cell). Besides those issues, it's been working great! It would be great (and maybe it does this and I just haven't figured it out yet) to be able to just receive text alerts only to any numbers programmer instead of both text and voice! I haven't had it yet too long, so I'm still discovering and playing around with it. A little surprised that not much of a manual came with the unit.
    JOS MANUEL -- la pobla de vallbona, XX   2/7/2011
    Everything was in correctly.
    NICHOLAS -- santa clara, CA   1/29/2011
    interfaces well with the base unit, and is relatively easy to configure and install. My only complaints are that it seems to be relatively insensitive in terms of cellular reception; and it's tremendously expensive.
    G. Howsgrove -- raleigh, NC   11/24/2010
    Unlike what another user indicated in their review, the GSM interface can NOT be used with the web interface! I purchased both and it did not work. The web interface does not have have its own power adapter -- it gets its power through the connection to the control panel and connecting through the GSM modem as the other reviewer suggested does not provide enough power.
    KENDALL -- champaign, IL   11/5/2010
    Unlike what another review indicated, it can NOT be used with the Web Interface. I purchased both and tried plugging the Web Interface into the Aux port on the bottom of the GSM unit as suggested but it did not work. I confirmed with Visonic you can only use one or the other.
    KENDALL -- champaign, IL   10/18/2010
    Unit was never able to get a strong enough signal to connect. Tried both AT&T and T-Mobile SIMs and every room in the house -- even stood in my back yard, but always poor signal. Cell phones with either of the SIMs I tried always had 3 or 4 bars in the same locations. Returned the unit as defective, but the replacement had the same issue. Seems like awful quality control on this product (look for other reviews online). Was willing to try a third unit, but Smarthome wouldn't extend the 30-day return window long enough for me to be able to receive and test the replacement, so had to return the entire Securelinc system and sensors. A real shame since I really liked the Securelinc system, but no working cellular modem was a deal-breaker for me.
    AWEstun -- austin, Texas, USA   2/22/2010
    Keep in mind that if you plan to use the GSM Interface that prepaid cell phone plans also work. Also, despite what other reviewers have reported, the Web Interface can be used with the GSM Interface - just plug the Web Interface into the Aux. port on the bottom of the GSM Interface. Five stars!
    BONNIE -- pittsburgh, PA   2/1/2010
    Not very easy to set up with the SecureLinc system. Does not have all of the features that a dedicated POTS line would offer. Other than that I like it.
    MICHAEL -- goose creek, SC   12/1/2009
    Easy to install. Connectivity with our X10 devices via the connected SecureLinc system makes life easy.
    RICHARD -- aurora, CO   4/20/2009
    Had more trouble getting the SMI card activated from my cell phone provider than getting the unit installed. Which by the way was very easy and once intiated, worked immediately with no problem(s). Getting notifications on my cell and loving it.
    Dave -- Southeastern North Carolina   12/20/2008
    Works great, easy to install. I use it as only/primary phone connection. Have a prepaid GSM SIM card, which connects easily. I had no problem installing flush mount with the included bracket, and no problem with tamper alarm when the bracket is installed with all four screws, as the instructions indicated for tamper protection. The GSM modem not only calls up to four phones as the 73903 SecureLinc is built to do, but it also adds some cool features. You can arm and disarm by sending in text SMS messages. It will respond to your request for Status check by sending you a text message. Not only does it call up to four private phone numbers and report alarms, alerts, and latchkey actions; but you can also program it to send you SMS message alerts, as well. Adds a clear level of sophistication to the already high quality SecureLink system.
    JEREMY -- belleuve, WA   11/1/2008
    The unit worked fine. It's just not obvious when or why things might go wrong. (prepaid card out of $$ or the like). Also, if you're planning to use the PowerMax web server, forget it. It's either/or. You can either use the GSM module or have the PowerMax installed since there's only one external port on the SecureLinc.
    ALBERT D -- concord, CA   3/30/2007
    Works great! A long awaited safety net for my alarm system.
    ZJ -- bubank, Illinois   2/19/2007
    I have the unit installed using prepaid GSM SIM card. It works. A couple of small problems: I received a tamper alarm - I ended up placing a small cardboard piece on the button on the back of the unit (with the plastic template). I'm not sure why the back template would cause the tamper alarm. The second problem is I could not mount the unit flush against the wall. It's due to the CAT-5 cable going on the back of the unit to front CAT-5 plug. When first plugging unit in, it will cause a tampar alert; however, that should go away in less than a minute's time.

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