The HCD68TSD Low Radiation Telephone is a simple and practical government-only phone designed for regular wired communication terminals. It is mainly used for military and local Party and government special networks. Suitable for programmed, automatic, and common battery telephone exchanges, it features good voice transmission quality, high reliability, lightning protection, and low electromagnetic leakage.

Features：

Key Features

Compatible with FSK/DTMF caller ID standards.

3 selectable ring tones: loud, soft, and off options

Call-in: Up to 62 groups of 8;

Call: Up to 16 groups of 8 digits, dynamic storage available, up to 32 digits maximum;

10 sets of 16 single key memories, non-volatile even after power failure.

5-digit area code, caller ID filtering, 2-digit outgoing code

Hands-free volume adjustable

Breakaway feature. FLASH time: 1000ms/600ms/300ms/110ms optional.

A set of alarm clock features

Call forwarding; call return

Retain Function, Mute Function

New Power-On Indicator

Date, clock, and call timer functions;

Key Performance Indicators

Terms of Use

Ambient Temperature: -10℃ to 40℃

Relative Humidity: 10% ~ 95%

Atmospheric Pressure: 86kPa ~ 106kPa

Environmental Noise: ≤60 dB(A)

Key Technical Specifications

Electro-acoustic Parameters (5km): Sound Level Rating (SLR) ≤ 15dB

Receive Loudness Rating (RLR) ≤ 2 dB

Side Tone Masking Rating (STMR) ≥ 12 dB

Stable Return Loss (2km): ≥15dB

Echo Balance Return Loss (2km): ≥17 dB

Transmission and reception of non-linear distortion: ≤7%

Direct Current Resistance: ≤350Ω

Ringing Sound Level: High Gear ≥ 70dB(A), Low Gear < 67dB(A)

Wiring Resistance: ≤350Ω

Dual-Tone Multi-Frequency Signal Level: Low Frequency Component -9dBm±3dB

High Frequency Power -7dBm ±3dB

The high-frequency component level is 2dB ±1dB higher than the low-frequency component level.

Receive caller ID information FSK signal:

-37dBm to -6dBm

Average Mean Time Between Failures (MTBF): ≥5000h

Power Source: 3 AA batteries

Dimensions: 228mm x 180mm x 102mm