Viking 24 Line Ring Shaper/Booster - RG-224

Viking Electronics RG-224 24-Line Ring Shaper / Booster

The Viking Electronics RG-224 is a rack-mount ring generator that reshapes and amplifies ringing voltage for up to 24 analog PABX extensions, FXS ports, or IP phone system analog ports simultaneously. If your analog endpoints are failing to ring reliably — or not ringing at all — the culprit is nearly always insufficient ring voltage or a degraded sine wave from the PABX or ATA. The RG-224 corrects both problems in a single 1U appliance, delivering a clean 90 VAC nominal sine wave at up to 4 REN per line across all 24 channels. For installations wiring telephony and intercom systems in large commercial buildings, hotels, or campus environments, this is the unit to reach for when the phone system's built-in ring generator can no longer carry the load.

Key Features

• 24 Independent Ring Channels: Each of the 24 lines is driven individually at up to 4 REN capacity — meaning you can connect a standard analog phone or intercom unit on every port without worrying about aggregate ring load dragging down signal quality on adjacent lines.
• 90 VAC Nominal Sine Wave Output: The RG-224 outputs a clean 90 VAC sine wave (not a trapezoidal approximation), which is what analog telephone equipment expects. Degraded or clipped ring waveforms cause missed rings and erratic behavior on sensitive endpoints — this eliminates that failure mode.
• 55 VAC @ 4 REN Ring Load Handling: Under real load conditions, the unit maintains 55 VAC at 4 REN — enough headroom for standard telephone sets and most intercom stations without dropout.
• 20–150 VAC Incoming Ring Detection: The wide incoming ring detection range (20 to 150 VAC) means the RG-224 accepts ring signals from virtually any PABX, VoIP ATA, or FXS card without requiring signal conditioning upstream.
• Dual RJ-21X Female Connectors: All 24 lines terminate via two RJ-21X (Amphenol 50-pin) connectors — the standard interface for 25-pair telco cable. This makes integration with existing punchdown blocks and telco infrastructure straightforward, with no custom wiring required.
• Dual 120V AC Power Inputs: Two UL-listed 120V AC / 15V AC 2.2A adapters are provided, distributing power load across the chassis and supporting the full 24-channel output without a single point of failure on the supply side.
• 1U 19-Inch Rack Form Factor: At 483mm × 241mm × 44mm (19" × 9.5" × 1.75"), the RG-224 (often searched as RG 224) drops into a standard 19-inch equipment rack in a single rack unit — no custom enclosure, no shelf adapter needed.
• 0°C to 32°C Operating Range: Rated for standard indoor telecom room and IDF/MDF environments. This is an indoor-only unit — do not install in unconditioned spaces or exterior enclosures.

Integration and Compatibility

The RG-224 is compatible with analog PABX systems, IP-PBX analog expansion cards, FXS gateways, and hosted VoIP ATA deployments where the FXS ports cannot generate sufficient ring voltage or power for the connected endpoint count. It connects inline between the phone system's analog output and the station wiring, requiring no configuration — ring detection is automatic across the 20–150 VAC input range. Systems already using 25-pair telco cable terminate directly to the RJ-21X connectors. Consult your VoIP phone system documentation to verify FXS port ring voltage specifications before deployment. Pair with a quality PoE network switch when deploying alongside IP telephony infrastructure.

Frequently Asked Questions

Q: What types of phone systems is the RG-224 designed to work with?

A: The RG-224 is designed for analog PABX extensions, FXS ports, and IP phone system analog ports — any system where the ring generator output is insufficient to reliably ring connected endpoints.

Q: How many lines does the RG-224 support?

A: The RG-224 supports up to 24 analog lines, each with a capacity of 4 REN per line.

Q: What connector type does the RG-224 use?

A: It uses two RJ-21X female (50-pin Amphenol) connectors, the standard interface for 25-pair telco cable used in commercial telephony infrastructure.

Q: What is the ring output voltage of the RG-224?

A: The RG-224 delivers 90 VAC nominal sine wave output, with 55 VAC at 4 REN under load.

Q: What is the warranty on the RG-224?

A: Viking Electronics covers the RG-224 with a two-year limited manufacturer warranty.

Q: Can the RG-224 be installed in an outdoor or unconditioned space?

A: No. The operating temperature range is 0°C to 32°C (32°F to 90°F) and operating humidity is 5% to 95% non-condensing — this is an indoor telecom room installation only.

Marty Allison

The problem the RG-224 solves is one I see regularly on large hotel and campus rollouts: the PABX or VoIP gateway has plenty of FXS ports but the built-in ring generator tops out at 1–2 REN per port total — not per line. Once you hit 8 or 10 analog stations on a single card, phones start ringing intermittently or not at all. The RG-224 breaks that bottleneck by providing a dedicated 90 VAC sine wave source at 4 REN per line across all 24 channels simultaneously.

Technical Highlights:

• Wide Input Detection (20–150 VAC): Accepts ring signals from virtually any PABX or ATA without upstream signal conditioning — you are not locked into a specific system voltage.
• Clean Sine Wave Output: 90 VAC nominal sine wave (not trapezoidal) eliminates the erratic ring behavior that clipped or square-wave ring signals cause on analog phones and intercoms.
• Dual RJ-21X Termination: Two 50-pin Amphenol connectors handle all 24 lines — connects directly to standard 25-pair telco cable, which is already in the wall in most commercial buildings.

Deployment Considerations:

• The two UL-listed 120V AC adapters must both be connected for full 24-channel operation — factor two available AC circuits into your rack power planning.
• Operating temperature tops out at 32°C (90°F): standard telecom rooms are fine, but an unconditioned equipment closet in a warm climate will push this limit — verify ambient temp before installing.

The RG-224 is the right unit for hotel PBX rooms, university IDF closets, or any commercial deployment where a single PABX card drives 10+ analog stations and ring reliability has become a support call driver.