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System Programming Guide
The Omnicom FS2828 is 2 line, 8 extension PABX suitable for domestic and small office use.
It has the following features:-
The box is mounted to a wall and connected to a mains supply via the supplied adapter. The external line(s) are connected
directly to a BT socket. The only real work is in connecting the extensions. These connect via standard punch-down blocks, much
like a normal telephone extension socket except there's eight of them
The system can be programmed from a standard touch-tone phone connected to any of the Omnicom's extension ports.
A synthesised voice guides you through the process of configuring the system, setting the clock, etc. It also has a
The Omnicom will work quite happily with one or two external telephone lines. The unit has two cables with standard BT phone plugs
attached to connect to the separate telephone sockets. It has some useful features, for example, you can designate one of the
lines to be a fax/data line, in which case incoming calls will be automatically directed to a nominated extension. However, when
placing outgoing calls, the Omnicom will use whichever line is free, without any intervention, allowing two external calls at
Eight extension ports are provided with numbers 220 to 227. There are a number of options that can be specified for each
extension, such as Call Barring, Auto-9, etc. For example, Jake has a phone in his bedroom on Extension 225. This has been
programmed to allow internal calls and external calls from pre-programmed shortcut numbers only. The modem for the Internet
Gateway is on Extension 227. This has Auto-9 enabled which means that it does not need to dial 9 to get an outside line
first (these are all programmable features).
In the event of a power failure, an internal relay within the Omnicom will automatically connect Extension
220 to the telephone line. This ensures that at least one phone continues to work.
The Omnicom provides Call Hold, Transfer, Park and Divert functions.
Smoke Detector Connection
A port is provided that allows direct connection of a smoke detector, or other alarm device. This causes all internal
phones to be called simultaneously in the event of an emergency.
Speaking Clock, Do Not Disturb, Door Intercom and release interface.
ID information is not passed to any of the extensions. This means that any Caller ID devices need to be attached directly to the
a power failure, a voice prompt is given whenever a phone is used reminding the user that the clock needs resetting.
With Acknowledgment to Steve Morgan.
Note: a lot of the programming which refers to things like 'Premium Rate'
would be the Premium Rate numbers then in use when the system was produced
i.e. 0898 and hence will not work with modern day codes.
The same applies to Phoneday and Prephone day versions of the software and
codes in use at the time.
Omnicom Hints and Tips
1. Buzzing on all lines
Smoothing capacitors have failed.
The below should only be attempted by a suitably qualified competent person.
Disconnect power from unit.
Disconnect incoming phone lines.
Disconnect all extension and other cables from front of
Unscrew 6 screws from back of unit and remove back, exposing
the main board.
Remove the main board, by pressing on the extension
connecting blocks on the front of the unit lifting to 30 degrees then easing clear
of the connectors at the top of the board.
Unscrew 4 screws securing the power unit board, exposed by
removing the main board.
Replace all capacitors C6, C7 & C8 (1000uf 35v - RS Part
Number 339-1038) or
35V CPC Part Number CA04937 pack of 5 and C7 & C8 2200uF 16V CPC Part Number
CA04930 pack of 5) and C77 & C106 (470uf 120v - RS Part Number 339-7127).
You may find it better to leave the "legs" on C77
& C106 and solder the new capacitors to these.
You may also have to cut away some of the box interior to
allow the refitting of the boards, as the new capacitors are larger than the
old one (the CPC capacitors are a direct replacement and do not need
Reassemble the unit in the reverse order, taking care to
ensure all connector pins, between the two boards, can be viewed through the
small holes in the top of the main board.
2. Not connecting to answer party first time
Omnicom set to Pulse Dial and needs to be set to Tone Dial.
Enter programming mode by lifting any handset and press #2828
Press 91, the omni will respond by saying "Line 1 Pulse" or
"Line 1 Tone". If the response was "Line 1 Pulse", re-enter 91 to set tone
Press 81, the omni will respond by saying "Line 2 Pulse" or
"Line 2 Tone". If the response was "Line 2 Pulse", re-enter 91 to set tone
Put the handset down.
3. Problem setting Mercury 132 pin
There is an error in the manual.
After Entering * as the password you must enter a # to continue.
4. Unrecognized Number when using Mercury 132
* is dialled to line as the password, with older exchanges this was ignored
however with modern exchanges it is processed as an invalid digit causing the
.Unrecognised Number. message from the exchange.
Enter the Mercury password (Programming options 95 + 85) as 2 and program the
Mercury Access Code (Programming options 96 + 86) as 13 (Omitting the 2).
5. Lost Pin / Fails to respond to user programmed pin and
Lost / forgotten pin OR power surge.
Remote reset is no longer available, it is suggested to disconnect from the mains for
a minimum of 24hrs and try again (if this doesn't work then disconnect the RAM
battery and then reconnect - at your liability).
6. Unexpected Results
Corrupted programming possibly due to power surge.
Reset the unit to factory defaults by entering programming mode and entering *9
then re-program all options.
7. Memory loss after power outage
Generally caused by RAM battery failure.
Replace RAM battery.
The battery is a 3.6v ni-cd. These are available from CPC (Part number
BT00181). It is suggested that the original battery be replaced with two
long leads which are then connected to the ni-cd cell. This will allow for
easy replacement in future as it is can now be externally mounted.
Thanks to Terry Abrahams for the information on replacement of Capacitors
and ni-cd battery and Mike Holdaway for the capacitor update.