參數(shù)資料
型號: P2500AA61RP
英文描述: MCU CMOS 80 LD 33MHZ 8K EPRM, 0C to +70C, 80-TQFP, TRAY
中文描述: SIDAC的| 290V五(公報)最大| 800mA的我(縣)|對220VAR
文件頁數(shù): 63/161頁
文件大?。?/td> 986K
代理商: P2500AA61RP
SIDACtor
Data Book
PBX Systems
Teccor Electronics
(972) 580-7777
3 - 23
R
+2$
Branch Exchange Switches
PBX
s, KSU
s, and PABX
s contain line cards that support various transmission
protocols such as ISDN, T1/E1, HDSL, and ADSL (Figure 3-24). PBXs also have
features such as a POTS (plain old telephone service) pull through which allows
stations to have outside line access in the event of power failure. All incoming lines to
the PBX are subject to environmental hazards such as lightning and power cross.
Protection Requirements
Branch exchange switches should be protected against over-voltages that can exceed
800V and surge currents of up to 100A.
Applicable Regulatory Requirements
FCC Part 68
UL 1459
UL 1950
Branch Exchange Reference Circuit
The following sections contain interface circuits used for protection of PBX line cards.
For POTS protection see pages 3-3 through 3-6.
For ADSL/CDSL protection see page 3-8
For HDSL protection see page 3-10.
For ISDN protection see page 3-12.
For T1/E1 protection see page 3-16.
For Station Protection see pages 3-19 through 3-23.
Figure 3-24 PBX Overview
Stations
To Network
Logic
PBX
POTS
T1/E1
ADSL
HDSL
ISDN
L
M
S
S
C
S
C
Station Primary
Protection
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