P1200S Teccor Electronics, P1200S Datasheet - Page 97

• Manufacturer Part Number: P1200S
• Description: solid state crowbar devices
• Manufacturer: Teccor Electronics

Figure 3.9 HDSL Overview
© 2002 Teccor Electronics
SIDACtor
®
Central Office Site
DS-1 Rate
Interface
(1.544 Mbps)
Data Book and Design Guide
Protection Circuitry
Longitudinal protection is required at both the HDSL Transceiver Unit – Central Office
(HTU-C) and HDSL Transceiver Unit – Remote (HTU-R) interfaces because of the ground
connection used with loop powering. Two P2300SC MC SIDACtor devices provide
overvoltage protection and two F1250T TeleLink fuses (one on Tip, one on Ring) provide
overcurrent protection. (Figure 3.10) For the transceiver side of the coupling transformer,
additional overvoltage protection is provided by the P0080SA SIDACtor device. The
longitudinal protection on the primary coil of the transformer is an additional design
consideration for prevention of EMI coupling and ground loop issues.
Figure 3.10 HDSL Protection
HTU-C/HTU-R Interface Protection
Ring
Ring
HDSL transceiver unit
Tip
Tip
HTU-C
F1250T
F1250T
F1250T
F1250T
P2300SC MC
P2300SC MC
P2300SC MC
P2300SC MC
784 kbps Full-Duplex loop
784 kbps Full-Duplex loop
< 12,000 ft, 200 kHz BW
+2.5 V signal level
2B1Q, Z
O
=135 W
3 - 9
P0080SA MC
P0080SA MC
Power
Sink
HDSL transceiver unit
Remote Site
High Speed Transmission Equipment
HTU-R
http://www.teccor.com
TX
RX
DS-1 Rate
Interface
(1.544 Mbps)
Transceiver
[phone]
HDSL