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    • Home  / Product Manuals & Documentation
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    ELK-955 — Two-Line Phone Jack & Surge Suppressor Manual

    September 08, 2026 3 min read

    Complete manual for the ELK-955 Two-Line Phone Jack & Surge Suppressor, an FCC-listed RJ-31/38X disconnect block protecting two telephone lines from damaging transients.

    💾 Download Original PDF 🛒 View Product
    Full text manual (for reference)

    Manual for the ELK-955 Two-Line Phone Jack & Surge Suppressor — an FCC-listed RJ-31/38X disconnect block that protects communications equipment on two incoming telephone lines from damaging transients, ideal for digital communicators in both security and fire applications.

    Application

    The ELK-955 Two-Line Phone Jack & Surge Suppressor is an extremely effective device for protecting communications equipment from damaging transients coming in over the telephone line. It is FCC listed as an RJ-31/38X disconnect block, making it ideal for use with digital communicators for both security and fire applications.

    Features

    • Superior solid-state surge suppression
    • Rapid response time
    • Protects two incoming telephone lines
    • Clamps line-to-line and line-to-ground
    • Self-restores after surges within ratings
    • RJ31/38X 8-position modular jacks
    • Convenient test points for lineman's test set
    • Attractive surface-mount enclosure

    Specifications

    Response Time < 1 nanosecond
    Breakover Voltage, Telephone Line 300 Volts
    Peak Pulse Current, Telephone Line 100 Amps
    Ground Wire 24" - 14 gauge stranded
    FCC Compliance Part 68 — FCC Reg. No. 5K6USA-23140-XP-N, Ren. No. 0.0B
    Warranty Lifetime Limited Warranty

    Connections

    Terminal Function
    EGND (Earth Ground) Connect to a good quality earth ground using 14–16 gauge wire. Best choices: a copper or galvanized rod (6' or longer) driven into the ground, or a metallic cold water pipe. Do NOT use PVC pipe. If all else fails, a less effective alternative is the ground screw on an electrical outlet cover.
    TELCO Line 1 — RING / TIP Connect the Incoming Telephone Line 1 pair. RING is commonly colored red, TIP commonly green.
    HOUSE Phone 1 — R1 / T1 Connect the pair returning to House Phone(s) on Line 1. R1 commonly black, T1 commonly yellow.
    TELCO Line 2 — RING / TIP Connect the Incoming Telephone Line 2 pair (same color convention as Line 1).
    HOUSE Phone 2 — R1 / T1 Connect the pair returning to House Phone(s) on Line 2 (same color convention as Line 1).
    J1 & J2 Modular Jacks Using individual 8-wire modular cords (3 ft or longer for optimum surge protection), connect the equipment to be protected (digital communicator, 8-pin RJ telephone key set, etc.) to modular jacks J1 and J2. Pins 4 & 5 are RING and TIP going to the equipment; pins 1 & 8 are R1 and T1 returning from the equipment. Pins 2 & 7 are shorted together by jumpers to create closed-circuit tamper loops for supervising the modular plug. To convert to resistored EOL circuits, cut the jumpers and attach the required resistors in series.

    Warranty

    Elk Products, Inc. warrants to the original purchaser that its products are free from defects in material and workmanship at time of shipment. Obligations under this Lifetime Limited Warranty are limited to repairing or replacing, at Elk's option, any product returned freight-prepaid. The warranty does not cover damage from negligence, accident, mishandling, lightning, flood, or other acts of God; products not operated per instructions; products altered or repaired outside authorized facilities; or attached adaptations/accessories that adversely affect performance, safety, or reliability. Batteries and fused transformers have their own separate warranties. Contact Elk Products or an authorized distributor for a Return Authorization (RA) number before returning a malfunctioning unit.