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Chapter 2 Technology parameter and Construction
2.1 Technology parameter
2.1.1 Capacity
Internal line: 16- 32 Ext. Ports
Expansion-- 8 ports per unit
External line (loop circuit trunk): 4-8 Ports
Expansion-- 4 ports per unit (CP832 Series)
2 ports per unit (TP832 Series)
keyphone: 1-4 Ext. port (601-604)
2.1.2 Interface Type
1. EXT Interface Type:
A. B. line 40V (Feeding)
2. Trunk Interface Type:
Incoming ringing-current, outward dual-tone signal
3. Internal Exchange Construction:
Analog type, exchange network and 8 x 16 analog switch array.
4. Transport Features:
Exts-C.O.line≤1.0 dB
Exts-exts ≤1.5 dB
Crosstalk attenuation ＞67dB
Feeding Current ＞18mA
Ring Resistance R≤1KΩ
5. Ringing Current
6. Dialing tone of interior line:
450HZ sequential square wave
7. Answering tone of interior line:
450HZ square wave for 1s and stop for 4s
8. Busy tone of interior line:
450HZ square wave for 0.3s and stop for 0.3s
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