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TISP4xxxL3BJ Overvoltage Protector Series
APPLICATIONS INFORMATION
Power Cross Pass Routes
This discussion covers typical modem flows.
Flow
Box A
Comment
A
Y
B
N
No tests
The criterion for box A is if the modem connects to an outside TNV line.
The majority of modems will be connected to an outside line, so the answer is
yes. The yes path goes to box B.
Box B
A
Y
The criterion for box B is if the equipment has a limit of ≤ 100 A 2 s at 600 V rms
for Test 1. Many interpret this as a fuse with I 2 t ≤ 100 A 2 s and often miss the
B
Y
C
N
E
600 V a.c. breaking requirement. However, the current loop is comp leted by
the fuse and other equipment compon ents. To ensure that the fuse I 2 t sets
the equipment performance, the other current loop componen ts, such as the
printed wiring (PW), must have higher I 2 t values than the fuse. Certainly the
fuse I 2 t needs to be lower than 100 A 2 s but other compon ents, for example IC
packaging, may impose a hazard-free limit of 10 A 2 s. (This conflicts with TIA/
EIA-IS-968 Type A surge pass requirement of 8 A 2 s.)
A yes leads to box C and a no to box E.
Boxes E and I
E
N
I
N
The criterion for box E is for a minimum telecommunications line cord of No.
Y
F
Y
Fail
26 AWG to be supplied or specified.
A yes leads to box F and a no to box I.
The criterion for box I is to pass Test 1.
If all the four pass criteria of Test 1 are met, this is a yes and the flow goes to
box F.
A no result fails the equipment.
AUGUST 1999 - REVISED JANUARY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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