B3104U
| Model | B3104U |
| Description | solid state crowbar devices |
| PDF file | Total 212 pages (File size: 2M) |
| Chip Manufacturer | TECCOR |
High Speed Transmission Equipment
exceed 10 mA
PK
at any time. As an alternative to carrying out this test
on the complete equipment or device, the test may be carried out
separately on components, subassemblies, and simulated circuits,
outside the unit, provided that the test results would be representative of
the results of testing the complete unit.
COT
F1250T
P1800SC MC
TX
P0300SA
P1800SC MC
T1
Transceiver
Regenerator
F1250T
P0640SC MC
RX
Power
Source
F1250T
P1800SC MC
F1250T
T1
Transceiver
RX
P0300SA
P1800SC MC
F1250T
P0640SC MC
TX
Figure 3.17
T1/E1 Protection
The peak voltage for 120 V rms is 169.7 V. The minimum stand-off voltage for the P1800 is
170 V, therefore, the P1800SC MC will pass the test in Section 4.4.5.2 by not allowing
10 mA of current to flow during the application of this test voltage.
For the transceiver side of the coupling transformer, additional overvoltage protection is
shown in Figure 3.17 using the P0300SA
SIDACtor
device. When an earth ground
connection is not used, only metallic protection is required. Metallic protection is satisfied
using a single P0640SC MC
SIDACtor
device across Tip and Ring and a single F1250T
TeleLink
fuse on either Tip or Ring.
Component Selection
The “SC MC”
SIDACtor
device 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 voltage rating
of the P1800SC MC was selected to ensure loop powering up to 150 V. The voltage rating
of the P0640SC MC was selected to ensure coordination with varying voltage signals.
© 2002 Teccor Electronics
SIDACtor
®
Data Book and Design Guide
3 - 15
http://www.teccor.com
+1 972-580-7777
Reference Designs
F1250T
