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School intercom

体彩江苏7位数中5位数:School intercom

model:KNZD-20W
size:
material:SUS201

School interom
The school intercom is a full-duplex one-way video ip intercom.The school intercom uses metal stainless steel as the raw material for the outer casing, which has the function of preventing damage and corrosion. There are analog and ip versions of the school intercom, and there are embedded installation and wall-mounted installation methods.
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江苏7位数18128期开奖号码 www.xrhest.com.cn school intercom description

School intercom KNZD-20W

   The school intercom is designed and produced for the school intercom system. In some old schools, the school emergency intercom system is not perfect. We independently developed the designed school intercom system, cooperated with the column-type POE column, the intercom system and the campus broadcasting system into the intercom ip pbx system. The school intercom uses ip network communication, the cost is low, the call quality is good, and the signal is stable.      

Main Features:
 
It applied SHARP,CMOS camera. Matching with most PABX, PBX and PAX systems,eg:NEC,LG,AVAYA
 ZTE,TADIRAN.
 
1.  Main body with whole stainless steel body, solid and temperature bearable
2.  Handset free, loudspeaker,
3.  Resume lightning proof protection automatically standard to ITU-T K21
4.  Waterproof grade is IP65(can improve to IP67)
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. Embed style and hanging style can be chosen. 
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 33-60V.
2. Ambient temperature: -30 ~ +60 degreeRelative 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.
6. Super strong function is available for dialing 12 groups of numbers stored in the memory

 (maximum length of each number is16 digits)


Model
GD-B261C
Pickup device
1/3 OV7949 CMOS
SYS
PAL/NTSC
Effective Pixels
268(H) x586(V)x / 510(H) x 496(V)
Sensing Area
5.961mm x 4.276mm
Scanning System
2:1 Interlaced Scanning
Sync System
Internal Synchronization
Sharpness
420TV lines
Horizontal Sync Frequency
15.625KHz / 15.734KHz
Vertical Sync Frequency
50Hz /60Hz
Minimum Illumination
0Lux/F2.0 with IR
Video Output
1.0vp-p, 75Ω
Gamma Coefficient
0.45
AGC
Auto
Sound / Noise Ratio
>48dB
White Balance
Auto
Electronic Shutter

2
1/50-1/80000(s) / 1/60-1/80000(s)

Backlight Compensation
Auto
Current
80mA ± 10%
Voltage
DC 12V±10%
Operating Temperature
-20°C~50°C, RH95% MAX
Storage Temperature
-30°C~60°C, RH95% MAX
Lens
3.6mm F = 2.0
Camera Angle
90°
Weight
25 g
certificate

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