Tunnel Emergency phone（KNZD-13）

Matching with most PABX, PBX and PAX systems.

1. Main body with cold-roll steel sheets body, solid
2. Handset free, loudspeaker, LED incoming call indicator
3. Resume lightning proof protection automatically standard to ITU-T K21
4. Waterproof grade is IP55
5. The metal shell is provided with grounding connection device and is absolutely insulated with inner circuit and electric, then has the effect of electromagnetism shield.
6. Support hotline call, can realize ring off automatically if the other side close.
7. Totally adopt SMTC craftwork keep very good quality.
8. The design is super thin and smart, wall mounting style.
9. Every call is limited (set by five minutes), auto ring off if time exceeded. (Optional)
10.The telephone has passed the certificate of ISO9000(2000)

Applications:
As Public telephone for indoor or outdoor, elevator phone, Taxi or bus stands or station, Highway call box. Railway, metro, ATM machines side, Tunnel, Port, Dock, Mines, Generation facilities….
A good ideal telephone for use in wet or corrosive atmospheres
Specification:
Main technical indexes:
1. Applicable for various types of SPC exchange and dispatching exchange system with feeding voltage of 48-69V.
2. Ambient temperature: -30 ~ +60 degree
Relative humidity: 10%~95% Atmospheric pressure: 86~106Kpa
Circumstance noise: less than 60dB(A)
3. Sound level of ringing: over 70dB(A).
4. Standard frequency: low frequency group: 697. 770. 852. 941Hz,
high frequency group: 1209, 1336, 1477Hz, frequency deviation: -1.5%~+1.5%
If service line is a 3Km signal-level:
Standard frequency: low frequency group: -12dB~-6dB, high frequency group: -10dB~-4dB, level difference between low and high frequency of compound signal: 1dB~3dB, the total distortion caused by intermodulation of harmonic wave is lower than the basic level by at least 20dB.
5. Call transmission index: (5KM)SLR<12, RLR<-1, STMR>10, output impedance is 600 Ohm.