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Model 45B  Z-Patch


A Remote-Programmable, Multi-User Telephone Interconnect

Model 45B  Z-PatchOPERATION

The Zetron Model 45B is a microprocessor-based radio-to-telephone interconnect. It�s designed to provide flexible operation as a full-featured telephone patch with selective calling, ANI decode, and advanced airtime billing features.
The Model 45B interfaces a radio system to the public telephone system for interconnected conversations. It also provides selective calling of mobile radios and pagers from the telephone system or from other mobile radios. An RS-232 serial port allows on-screen manipulation of all system and user information. The system and user database can be �downloaded� and �uploaded� using a PC with Zetron ZCU software installed. Remote DTMF (Touch-Tone) programming is also supported.

The Model 45B is designed for radio common carriers, co-ops, utilities and private systems where a number of different users need to share the system yet receive different service and separate accounting.

User Identification

Every user on the system is given a unique user code. These codes refer to user records in the Model 45B�s internal database. A user�s record contains information about access privileges, selective call type, and other unique parameters assigned to that particular user. The record also accumulates the user�s call statistics. People wishing to access the system identify themselves by entering their user codes on their DTMF radio keypads. Or, if the radios have DTMF ANI (automatic number identification), the codes are sent automatically. The Model 45B can also require a code to terminate a call.

Calls From the Telephone System
A person at a telephone calls a mobile radio by dialing a regular seven-digit number. If the Model 45B answers with a dial tone, the person �overdials� the user number of the desired mobile radio. If the Model 45B is equipped with the voice prompts option, a recorded voice tells the person when and how to overdial. If the DID converter option is installed, overdial is not necessary.
The desired mobile radio is alerted with a distinctive ring-out tone and paging, CTCSS, or digital squelch code. To ensure the call is answered by the correct party a user code can be required to answer the line. A second telephone line can be dedicated for normal use or priority access (priority overrides calls in progress). If desired, both lines can automatically call a certain mobile in the absence of overdial.

Calls From a Mobile
A person with a mobile radio can place calls only if his or her user record in the Model 45B internal database allows. A person places a call by keying a valid user code followed by a phone number. The user may be restricted to using only the nine speed-dial telephone numbers. The user can also be restricted from using certain PBX access codes, long distance or operator prefixes, or certain first and second digits.
The Model 45B can still allow calls to 1-800, 1-888, and 9-1-1 even if other toll restrictions are in place.
The Model 45B automatically dials into the telephone system using Touch-Tone or rotary pulses. If two outgoing lines are available, then the line into which the Model 45B dials depends upon how the owner configured the user�s record. Or, the line can be user selected, allowing toll-free calling over a wider area if the Model 45B straddles two adjacent service areas.


Flexible Operation
Almost all functions of the Model 45B can be customized by the owner. For instance, choices are made for the type of radio system and the type of dialing. Fine-tuning technical parameters like COR and VOX timers ensures that conversations are not interrupted by awkward clicks and pauses. A whole list of features can be customized differently for each user on the system.

Programming the Model 45B
The Model 45B can be programmed from a variety of sources (see diagram next page). A remote Model 45B can be completely controlled via PC through the public switched telephone system. The system manager never has to leave the office. The built-in modem also allows Zetron technicians to dial up and diagnose a Model 45B from the Zetron factory in a matter of minutes.

On-screen with a CRT or Computer
One of the most powerful features of the Model 45B is that it can be completely programmed and supervised from a CRT or personal computer. It�s no longer necessary to use long strings of DTMF (Touch-Tone) commands. On your computer screen, you'll see questions like, �Fast ANI required?� You simply select yes, no, or an appropriate number from a given range. The on-screen method puts commands before your eyes for visual verification before they�re sent to the patch.
Another handy feature of CRT or computer control is an on-screen �user programming chart� that shows, in a single glance, all chosen parameters for each individual user. The chart can be printed out on a printer for a convenient reference guide.
Since the Model 45B is equipped with an internal memory buffer, you can use a CRT or computer to retrieve per-user airtime information for billing purposes. The optional ZEBRA Billing System software package will process this information and provide detailed or accumulated billing reports. ZEBRA also lets you save all programming on diskette, make various traffic analyses, and make back-up programming diskettes in case of lightning strikes.


  • Simplex, half- and full duplex operation
  • 99 or 325 separate users
  • Standard RS-232 serial port and internal modem
  • Remote access from CRT, computer, phone, or radio
  • Two telephone line inputs with auto-line select
  • One local telephone input for local phone or DID
  • Calling restrictions/privileges per user
  • Compatible with rotary telephone (dial click)
  • User and system database in nonvolatile memory
  • DTMF ANI decode and validation
  • Seven ringing sounds for mobile alerts
  • Nine system speed-dial numbers
  • Regenerated DTMF (Touch-Tone) or pulse dialing
  • Sense inputs for monitoring external equipment
  • Relays for remote-control of external equipment
  • Remote diagnostics via modem
  • Options include paging formats, DID converter, call-accounting, voice prompts, dial click decoder, and radio specific cables




Power 100-130V AC, 60 Hz, 7 watts or 12-15V DC, 600 mA
Temperature 0 to 65 degrees Celsius
Size 19" W x 7.25" D x 1.75" H, 19" rackmount
Weight 7 pounds


Database 99 or 325 subscribers, up to 999 call detail records
ANI Length 1 to 8 DTMF digits
ANI Speed Up to 14 digits per second


Freq range 67 to 3500 Hz
Freq accuracy 0.1%
Freq stability 0.0005%
Distortion 2% nominal
Two-Tone Sequential Motorola/GE all tone groups, code plans, and capcodes
DTMF 1 to 7 digits per subscriber
2805 1 to 7 digits per subscriber
Five/Six-Tone EIA, ZVEI, CCIR single or dual address
CTCSS 38 standard EIA tones
Digital Squelch 104 Codes


Phone Jacks Two end-to-end (B1) phone lines, one local phone
Connector RJ11-C modular jack
Mode Full duplex operation, hybrid with fixed-null
Call progress tones Dial tone, ringing, interrupted ringing, busy, and reorder
Dial tone detection Single tone, adjustable, preset to 440 Hz


FCC Registration EYB5Q5-15387-OT-T
Incoming call Ring detection on tip-ring pair or dry contact closure to ground. Programmable number of rings to answer
Call answer Off-hook, tip-ring current draw or darlington output (wet)
Call disconnect Second dial tone for 2 seconds (440 Hz),
busy tone (0.5 Hz, 50% duty cycle)


Incoming call Loop start or dry contact closure, immediate dial
Call answer Darlington output (wet)
Call disconnect Local phone on-hook (For connection to 2500 deskset or DID converter)


PTT One Form-C relay closure, 100 mA max
COR Noise detector, VOX detector or voltage change
Subaudible output -40 to +6dBm. Hi/Lo Selector. 600 ohm output
Tx audio -40 to +6 dBm. Hi/Lo Selector. 1K ohm output
Rx audio -40 to +10 dBm. Hi/Lo Selector. 50K ohm input. 25 mV to 6 V P-P
Direct modulation CTCSS/Digital squelch, bipolar adjustable
System relays 2 each, remotely toggled by DTMF code from phone or mobile, form A relay closures to ground
User relays 2 each, programmable per user to automatically latch for duration of call, form A relay closures to ground
Sense inputs 2 each, Form-A relay closures input
Channel busy input Closure input from secondary receiver COR.
COR validation input Closure input to disable COR operation


Modem 300 baud Bell 103J or 1200 baud Bell 12
Indicators Line 1, Line 2, Local, VOX, DTMF, Carrier, CTCSS, Transmit, Page, Power
Switch Connect/disconnect
Station ID Morse code, fixed 1200 Hz frequency and selectable call sign
Operating modes Half-duplex and full-duplex, simplex VOX, simplex sampling, digital voice delay, per user
Equipment types Tone-only pager, Tone+Voice pager, Talkback pager, Mobile, Direct air
Prompt tones Progress tones, error tones, and warning tones sent to phone or mobile
Programming Programmable via DTMF phone, DTMFmobile, RS-232 or phone modem
Data retention Internal battery - backed
Secondary protection Telco high-voltage clamps with protective fusing elements
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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