NEC Aspila EX Hardware Manual page 174

CÔNG TY VIỄN THÔNG VIỆT PRO
Section 7: Specifications and Parts List
Constant Current Circuit: Current fixed at 47 mA
Signal Method
On-Hook Condition: 48VDC
Ringer Signal: 180 Vp-p, 16Hz
Signal Method
On-Hook Condition: -50VDC
Message Waiting Signal: -112VDC +/- 3VDC
Ringer Signal: 75Vrms +/-1Vrms (no load condition), 20Hz +/-1%
1.þDo not run station cable in parallel with the AC source, telex or computer, etc. If the cables are
near cable runs to those devices, use shielded cable with grounded shields or install the cable in
conduit.
2.When cables must be run on the floor, use cable protectors.
3.þCable runs for key telephones, single line telephones, Door Boxes, CTA or CTU adapters, and
2PGDAD Modules must be a dedicated, isolated cable pair.
4.þThe Telco RJ21X and cross-connect blocks should install to the right of the Main Cabinet.
Extension blocks and cross-connect blocks should be installed to the left of the Main Cabinet.
Device
Key Telephone, DSS
Console:
Single Line Telephone,
Analogue Terminals
(20mA):
20mA Setting:
35mA Setting:
SLT Adapter:
SLTAD to SLT:
2PGDAD Adapter:
Door Box to 2PGDAD:
Using Under Carpet Cable:
The cable is not twisted, but flat parallel wire. Good impedance balance cannot be expected and reduces
the cable length to no more than 300m when using flat cable.
7-6 Section 7: Specifications and Parts List
Chuyên phân phối tổng đài NEC
SLT Adapter
SLIU PCB / SLIDB
Cabling Requirements
Cable Requirements
Cable Type
2-wire 26 AWG
2-wire 24 AWG
2-wire 22 AWG
2-wire 26 AWG
2-wire 24 AWG
2-wire 22 AWG
1,140 ohm loop resistance
540 ohm loop resistance
2-wire 26 AWG
2-wire 24 AWG
2-wire 22 AWG
2-wire 26 AWG
2-wire 24 AWG
2-wire 22 AWG
2-wire 26 AWG
2-wire 24 AWG
2-wire 22 AWG
Cable Run Length
(Metres)
400
600
800
4000
6400
10600
6400M with 24AWG
3000M with 24AWG
400
600
800
15
600
600
800
60
100
170
Aspila EX Hardware
http://vietpro.com.vn
Notes