Viking Hot-Line Dialer Touch Tone - K-1900-5

Viking Electronics K-1900-5 Hot-Line Touch Tone Dialer

Overview

The Viking Electronics K-1900-5 is a phone-line-powered hot-line dialer built for facilities where you need a single, dedicated call path without the recurring cost of a leased or dedicated telephone circuit. Press one button and the K-1900-5 automatically dials a preprogrammed number of up to 32 digits — useful for guard stations, emergency call points, elevator cabinets, and gated-entry intercom systems wired back to a POTS line. Because it draws operating power directly from the telephone line at 24V DC / 20mA, there is no AC adapter to fail and no conduit run for separate power.

Viking Electronics produces a focused line of telephone interface products for security and facility applications. The K-1900-5 (often searched as K 1900 5) sits in their hot-line dialer family alongside multi-number variants — this model is purpose-built for the single-destination use case.

Key Features

• Telephone Line Powered (24V DC / 20mA): The dialer draws everything it needs from the telephone line itself, requiring a minimum of 24V DC talk battery and 20mA loop current. That eliminates the transformer, the outlet, and the installation labor for a separate power circuit — a real advantage when retrofitting into existing enclosures with no spare power capacity.
• Up to 32-Digit Programmable Number: A 32-digit dial string is enough for direct-dial extensions, access codes, PIN sequences, and international prefixes in a single programmed string. No separate DTMF encoder needed in-line.
• Dual Dialing Speeds — Normal and Fast: Normal mode operates at 100ms on/off cadence; Fast mode drops to 50ms on/off. Fast mode reduces the time the line is occupied during dialing, which matters on high-traffic analog systems where trunk seizure time is monitored.
• Compact 2.9″ × 2.1″ × 1.0″ Footprint: At under 3 inches in any dimension, the K-1900-5 fits inside standard surface-mount phone enclosures, elevator controller cabinets, and intercom backboxes without modification. The 1-inch depth keeps it clear of conduit knockouts on shallow enclosures.
• RJ11 Plug + RJ11 Jack (Pass-Through) Connections: One RJ11 plug connects to the line; one RJ11 jack provides a downstream pass-through for a handset or supplemental device. No punch-down block required — the modular connections support quick field installation and easy replacement.
• FCC Part 15 Class A Certified: Class A certification confirms the unit meets radiated and conducted emissions limits for commercial/industrial environments. It can be deployed in control rooms, server closets, and equipment racks without creating interference concerns for adjacent electronics.
• 32°F to 90°F Operating Range, 5–95% RH Non-Condensing: The temperature range covers most indoor commercial environments — lobby call stations, building security desks, interior elevator cabs. The non-condensing humidity specification means it handles ambient HVAC-controlled spaces but is not rated for unheated exterior enclosures in cold climates.

Integration & Compatibility

The K-1900-5 connects to any standard analog POTS line or analog port on a PBX/VoIP gateway that provides the minimum 24V DC talk battery and 20mA loop current. If your analog gateway or ATA outputs lower loop current — some consumer-grade ATAs drop below 20mA under load — verify the current spec before deploying. The dual RJ11 interface makes it straightforward to wire in-line between a line terminal and an existing handset without rewiring the wall jack. For deployments requiring speed dialing of multiple destinations rather than a single hot-line number, Viking's K-1900-9 is the appropriate variant in the same product family.

Frequently Asked Questions

Q: Does the K-1900-5 require an external power supply?

A: No. The K-1900-5 is telephone line powered, drawing 24V DC at 20mA directly from the phone line. No AC adapter or separate power source is needed.

Q: How many digits can the K-1900-5 store in its hot-line number?

A: Up to 32 digits, which accommodates direct-dial numbers, PBX access codes, and PIN sequences in a single programmed string.

Q: What is the difference between Normal and Fast dialing speed on the K-1900-5?

A: Normal mode uses a 100ms on/off DTMF cadence; Fast mode uses 50ms on/off. Fast mode reduces the total dialing time on the line, which can be beneficial on busy analog systems.

Q: Can the K-1900-5 be used with a VoIP gateway or ATA instead of a traditional POTS line?

A: Yes, provided the analog port delivers at least 24V DC talk battery and 20mA loop current — the same requirements as a standard POTS line. Verify your ATA or gateway specifications before deploying, as some consumer-grade devices may not meet these minimums.

Q: Is the K-1900-5 suitable for outdoor or unheated enclosures?

A: The rated operating range is 32°F to 90°F with 5–95% non-condensing humidity. It is designed for climate-controlled indoor environments. Unheated exterior enclosures in cold climates may fall outside this range.

Q: What connectors does the K-1900-5 use?

A: One RJ11 plug (line connection) and one RJ11 jack (pass-through for a handset or downstream device). No punch-down terminals are required.

Eden Phillips

The K-1900-5 earns its place in facility deployments specifically because of the telephone line powered design — 24V DC at 20mA pulled straight off the loop means zero dependency on local power infrastructure. I've specified it in elevator cab installations and guard-station call points where running a separate 120V circuit to the enclosure was either cost-prohibitive or structurally impractical.

Technical Highlights:

• Phone Line Power (24V DC / 20mA): Eliminates the AC adapter entirely. On a standard POTS line or a properly spec'd analog FXS port, the dialer is self-sustaining — fewer failure points, simpler UL inspection.
• 32-Digit Dial String: Enough capacity to encode a full DID number plus a DTMF extension and PIN in one stored sequence. No relay logic or secondary auto-dialer required in-line.
• Dual Speed Modes (100ms / 50ms): Fast mode at 50ms on/off noticeably shortens seize-to-ring time on congested analog trunks — worth enabling on systems where guards are timing response intervals.

Deployment Considerations:

• Verify your analog gateway or ATA delivers at least 20mA loop current before installing. Many entry-level ATAs are spec'd at 15–18mA under load and will cause intermittent dial failures with the K-1900-5.
• The 90°F upper limit is a real constraint in unventilated metal enclosures in direct sun or mechanical rooms — measure ambient before mounting, not after you get a service call.

Best fit: interior elevator cab call stations, lobby emergency call points, and gate intercom controllers tied back to an analog PBX port — anywhere a single dedicated call path matters more than feature flexibility.