P6002A Teccor Electronics, Inc., P6002A Datasheet - Page 99

• Manufacturer Part Number: P6002A
• Description: solid state crowbar devices
• Manufacturer: Teccor Electronics, Inc.

Figure 3.12 ISDN Protection
Figure 3.13 Pair Gain Overview
© 2002 Teccor Electronics
SIDACtor
Switching
System
Line 2
Line 1
ISDN U-Interface
Ring
®
Tip
Data Book and Design Guide
Central Office (CO)
F1250T
P2600SC MC
MDF
Component Selection
The “SC MC” SIDACtor devices and F1250T TeleLink fuse were chosen because these
components meet GR 1089 surge immunity requirements without the use of additional
series resistance. An MC is chosen to reduce degradation of data rates. The P2600SC MC
voltage rating was selected to ensure coordination with MLT voltages that can approach
150 V rms. The voltage rating of the P0640SC MC was selected to ensure coordination with
varying signal voltages.
Pair Gain Circuit Protection
A digital pair gain system differs from an ISDN circuit in that ring detection, ring trip, ring
forward, and off-hook detection are carried within the 64 kbps bit stream for each channel
rather than using a separate D channel. The pair gain system also uses loop powering from
10 V up to 145 V with a typical maximum current of 75 mA. (Figure 3.13)
Central Office
Terminal (COT)
VF
1
VF
2
HF
ISDN
Transceiver
RX
TX
Line powered
DSL 2-Wire,
160 kbps
3 - 11
2B1Q
Power
Source
ISDN S/T Interface
P0640SC MC
P0640SC MC
F1250T
F1250T
Remote Terminal (RT)
building or pedestal
HF
Terminal
mounted
Remote
High Speed Transmission Equipment
Power
Sink
VF
1
VF
2
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RX
TX
ISDN
Transceiver
[phone]
Customer
Premises
POTS
POTS
(CP)