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Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking Electronics, and its affiliates and/or subsidiaries assume no respon-
sibility for errors and omissions contained in this information. Revisions of this document or new editions of it may be issued to incorporate such changes.
Fax Back Doc 060 ZF290950 Rev DPrinted in the U.S.A.
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The SQRG-12 is a sequential ring generator option for use with the TMS-6X and TMS-12A. The SQRG-12 will re-ring lines for the
KSU/PABX based on line status information from the TMS-6X or TMS-12A.
The SQRG-12 is designed for applications where more than one person answers incoming calls, or in locations where the TMS-6X or
TMS-12A front panel display is not visible. The SQRG-12 eliminates confusion about which line to answer next by only ringing the old-
est call to the key system or PABX.
In some applications, it is desirable to have the SQRG-12 re-ring all calls that are ringing or holding within the call sequencer. This is
required in many PABX applications and some key system applications to prevent call crashing (glare) problems when the C.O. lines con-
nected to the TMS-6X or TMS-12A are also used for outgoing calls by the PABX or KSU. The SQRG-12 is capable of this mode of oper-
ation when DIP switch 3 on the TMS-12A is in the on position, or the TMS-6X has special software “TMX-PRAL” installed.
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SEQUENTIAL RING
GENERATOR
VIKING ELECTRONICS INC. HUDSON, WI 54016
VIKING
©
MODEL SQRG-12
POWER
13.8V AC
1.25A MAX
RESET
TMS
CONTROL LINE
1 2 3 4
ON
1 2 3 4
RJ21X
J2
RJ21X
J2
1 2 3 4
ON
ON
OFF
DIP
Switches
Switch
1
1
2
2
3
4
Position
ON
OFF
ON
OFF
OFF
OFF
Description
Receive line status data from the TMS-6X
Receive line status data from the TMS-12A
Ring cadence: 1 sec on, 3 sec off
Ring cadence: 2 sec on, 4 sec off
Unused (Leave in OFF position)
Unused (Leave in OFF position)
A. SQRG-12 Operation when Ringing Calls in Sequence
When the SQRG-12 is used with loop start C.O. lines, and you want the calls to ring through to the telephones in sequence (one at
a time), use J2 to block C.O. ringing from passing to the PABX or KSU. As a call rings in, the TMS-6X or TMS-12A detects the ring-
ing, and tells the SQRG-12 to ring that line through to the PABX or KSU (only if this line is the oldest call). If a live operator does not
answer, the TMS-6X or TMS-12A will answer the call, play the message and put the caller on hold, while continuously commanding
the SQRG-12 to re-ring that line into your system. As new calls ring in on other lines, the SQRG-12 blocks these calls from ringing
through to the PABX or KSU until they have become the oldest call. Once an operator answers the oldest ringing call, the TMS-6X
or TMS-12A will begin ringing the next oldest call through to the PABX or KSU. This process of ringing calls through one at a time
will continue until the operators have answered all holding or ringing calls.
B. SQRG-12 Operation when Ringing All Calls
When the SQRG-12 is used with either loop or ground start C.O. lines, and you want all holding or ringing calls re-rung through to
the telephones, use J1 to pass tip ground (for ground start trunks), and ringing through to the PABX or KSU. Note internal DIP switch-
es 1 through 12 must be set to OFF anytime you use the J1 jack. The J1 jack is a straight through jack, so in the idle state, the C.O.
tip and ring are passed straight through to the PABX or KSU. When the TMS-6X or TMS-12A recognize that there is an incoming
call on a line, the call sequencer commands the SQRG-12 to re-ring that line along with any other lines that are ringing or holding.
While the SQRG-12 is ringing a given line position of the PABX or KSU, the SQRG-12 constantly maintains a grounded tip condition
(for ground start lines), supplies -48V DC battery on the ring side of the phone line and superimposes its high voltage ringing on this
- 48V DC. This is purposely part of the SQRG-12 design to give the ground trunk card in the PABX or KSU the impression that the
line is a ringing line that has never been answered, even though the TMS-6X or TMS-12A may be holding a call on that line. All calls
will continue to ring through to the PABX or KSU until the call is answered by a live operator, or the caller hangs up (abandons).
Although the J1 jack was designed for ground start C.O. lines, it also works properly for loop start C.O. lines when using the “ring all
lines” mode.
Notes: If the PABX does not recognize lines on the TMS-12A as busy and call crashing is observed, set up those lines as “incoming only trunks” on the PABX. If those lines
must be used for inbound and outbound calls, set DIP switch 3 to on and switch 2 to off, on the TMS-12A. Do not install bridging clips on any connections which connect the
two halves of the punch down terminal block. Bridge clips should only be installed as a method of bypassing equipment. In order for the SQRG-12 to work properly, the four-
wire modular jack must be installed between the TMS CONTROL LINE on the SQRG-12 and the SQRG jack on the TMS-12A.
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