WISCO International

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Interconnected Repeater Panel


The Model 48-MAX Interconnected Repeater Panel is the latest, most powerful shared customer interconnect available from Zetron. It is designed for service providers who need the best in performance and reliability in order to compete most effectively when providing mobile communication services.
The 48-MAX may be equipped with previously unavailable capabilities, such as owner-recordable voice promotes, enhanced toll restriction, a telephone line expander, and intersystem roaming for wide-area coverage. These and other features ensure continued profitability and competitiveness for providers of radiotelephone interconnect service.
In addition to service providers, the M48-MAX is also ideal for private, user-owned systems that need a high degree of versatility and numerous convenience features.
Zetron customers will recognize that the 48-MAX is similar to the Zetron Model 48B Repeater Manager but with the addition of many exclusive, high-end features. For ease of configuration, the M48-MAX is available in three version: Basic, Selcall, and Roamer.


  • Shared radiotelephone interconnect with up to 750 user identities (ANI)
  • Available in 3 versions: Basic, Selcall, & Roamer
  • Operation with wide range of simplex or duplex mobile or hand-portable radios
  • Encodes and decodes 50 CTCSS, 104 DCS
  • 2-tone, 5-tone (PZVEI, EIA, CCIR, EEA), DTMF selective calling
  • Intersystem roaming capability for wide area coverage (wild ANI)
  • Interconnect Gateway for switchless, intersite dispatch
  • Owner-recordable voice prompts (option)
  • Enhanced toll restriction
  • PC-programmable with built-in modem
  • Billing records for up to 4000 calls (option)
  • 99 autodial telephone numbers
  • Conversation timers with �hog� penalties for both interconnect and dispatch calls
  • EMC Approval, CE conformity


Scheduled Telco Access (Selcall & Roamer Versions)
With scheduled telco access, the 48-MAX may be programmed such that telephone calls (both incoming and outgoing) occur during certain hours of the day only. The system owner also defines which ANI codes,  any, are allowed to access the telephone line during those periods. The owner may thus charge more for radio users who desire to use the telephone line during the restricted hours.

Scheduled telco access is a good way to preserve more airtime for dispatch (radio-to-radio) traffic. Telephone calls tend to be long, while dispatch calls are shorter in duration. Limiting telephone access during peak hours is a good method of freeing up more dispatch activity�a priority for many service providers.

Enhanced Toll Restriction
The 48-MAX is equipped to restrict telephone calls on both modern and older telephone systems. It takes into account the latest dialing procedures that have evolved within telephone networks worldwide. The toll restrict methods are designed for both versatility and customization. For instance, a prefix table can be created that specifies valid or invalid three-digit prefixes. This feature is particularly useful in metropolitan areas where it's possible to dial long-distance calls without dialing an area code.

The 48-MAX also �understands� area codes which don't necessarily have 0 or 1 as the second digit. To support a wide range of applications, any sequence of 2, 3, or 4 digits can be specified as valid or invalid.
Toll restrictions can be applied on a per-user basis. Some users can be restricted to local calls, some users can be provided with full access, and some users can be restricted to dialing pre-set autodial numbers only. The toll-restrict methods are very versatile. They take into account the latest dialing conventions such as 1-888 calls, 10-digit local calls, long-distance codes (10+ATT, 10-321, etc.) and PBX procedures.

Interconnect Hog Penalty
Some radio users have learned that when their conversation time runs out they can �hog� an interconnect by hanging up and then quickly dialing another telephone number, before another radio user has a chance to react. The interconnect hog penalty prevents the same radio user from placing back-to-back calls for a programmable period of time (0 to 250 seconds). This prevents someone with a speed-dial microphone or control head from beating other users in entering an access code and taking over the system for endless minutes at a time.

Radio Call Forwarding
Radio call forwarding is a feature that comes in handy on many systems. If a call to a field unit (mobile radio, hand-portable radio) is not answered after a programmable number of rings, the call can automatically be forwarded to a different field unit, including a pager. One of the most convenient applications is allowing a mobile-radio user to receive a call on a lightweight tone or tone-voice pager when away from the vehicle.
When a call is forwarded, the transaction is recorded in the billing database so that the owner may charge extra for the feature if desired.

Other Features

  • Call-Alert Beeps: notifies radio-to-radio talkers that a telephone party is attempting to place a call to a radio. The radio users may then elect to terminate their call so the phone party can get through.
  • 99 Autodials: for ease of dialing by the radio users, the owner may create up to ten blocks of autodials. A user is assigned to a block, and an autodial is initiated by * plus a single digit. If desired, radio users may be limited to autodials only, with no manual dialing privileges.
  • PBX Support: a hookflash signal may be initiated from a radio to manipulate PBX functions. This can give access to many PBX functions such as conference calls or call forwarding.
  • XMODEM Support: the industry standard XMODEM data transfer protocol, available in most off-the-shelf communication programs (e.g. Windows), is all it takes to establish PC communications with the 48-MAX. not support the XMODEM (Note: the utility ZCU does protocol.)
  • Cross-Tone, Cross-Code, and Tone-Code
    Encoding: radio users may call radios that operate on other tones/codes. The �crossed� tones/codes may be programmed into the database, or may be initiated with selective calling.
  • Two End-to-End Telephone Inputs: the second telephone input can be used in many ways by the creative system designer. For instance, it provides an easy method of separating users into different levels of telephone access privileges. It also allows one line to be a �priority override� line for emergency calling.




Power 10.5-16V DC, 700 mA or 9-12 VAC, 11 watts
Temperature 0 to 65� C (32 to 149� F)
Size Rackmount: 487 mm x 186 mm x 45 mm
(19" x 7.25" x 1.75")
Weight 1.8 kg (2 lb.)


CTCSS tones 50
DCS codes 104


DTMF ANI codes Full random programming, all 16 tone pairs
ANI capacity 99 / 750
ANI length 1 to 10 digits per user
ANI speed 1 to 14 digits per second
Validation Any of the 50 CTCSS or 104 codes can be used


Interconnect Airtime record per ANI 99:59:59 maximum. Accumulate or pre-pay
Dispatch Airtime record per tone/code 99:59:59 maximum. Accumulate or pre-pay
Call detail option Logs detailed call information number dialed, time/date stamp, duration and ANI
Capacity 4000 records stored internally
Filtering Toll only, all or none per ANI, errors on/off, minimum call duration
Logging All calls logged on local RS-232 port


Frequency range 67 to 254.5 Hz
Number of tones 50
Number of digital codes 104
Sensitivity < 3dB SINAD
Acquisition time Typically < 200 msec
Signaling Specifications
Frequency range 10 to 3500 Hz
Frequency accuracy 0.1%
Frequency stability 0.005%
Distortion 2% nominal
Two-Tone Motorola/GE all tone groups, code capcodes
DTMF 1 to 8 digits per subscriber
DTMF-t 1 to 8 digits per subscriber
Five/Six-Tone EIA, EEA, PZVEI, CCIR single or dual address
CTCSS 50 tones
DCS 104 codes


Lines Two end-to-end (B1) phone lines for
PSTN subscriber or PBX extension. One local phone port for connection to desk set
Connector RJ11-C modular jack
Progress tones Dial tone, ringing, double ring, busy
Call progress tones Dial tone, ringing, interrupted ringing, busy, and reorder
End-To-End for PSTN subscriber or PBX extension:
Incoming call
Ring detection on tip-ring pair or dry contact closure to ground
Call answer Programmable number of rings to answer Off-hook, tip-ring current draw
Call disconnect Busy tone, call limit, mobile activity timers, loss of loop current
Local phone input:
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 FET pull to ground
COR Dual time constant noise detector or voltage change
CTCSS/DCS output -40 to +6 dBm. 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. 25K ohm input
Channel busy input Closure input from secondary receiver COR


Modem Automatic detection of 1200 baud Bell 212, CCITT V.22 and 2400 baud CCITT V.22 bis
Indicators Line1, Line 2, Local, VOX, DTMF, Decode, Carrier, Transmit, Aux, Power
Switch Connect
Station ID Morse code, fixed 1200 Hz frequency a programmable call sign
(1-9 characters)
Equipment types Tone-only pager, tone+voice pager, talkback pager, mobile
Prompt tones Progress tones, error tones, and warning tones sent to phone or mobile
Programming Programmable via RS-232 with local terminal, or remotely over phone lines using 1200/2400 baud internal modem. Installation and user enable/disable via DTMF
Data retention Battery backed typically 5 years with no power
Real time clock Battery backed typically years with no power
Secondary protection On end to end lines
Auxiliary output FET pull to ground
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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