TISP4070L3BJ, TISP4350L3BJ
BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
AUGUST 1999 — REVISED NOVEMBER 1999
FLOW
COMMENT
boxes C and D
A
Y
B
Y
The criterion for box C is overcurrent protection that reduces currents
above 1.3 A. This requirement is met by a 1 A fuse (a 1 A current
fusing rating, not an IEC 1 A current carrying rating).
Modems which pass FCC Part 68 Type B surges and non-
operationally pass Type A surges can use a fuse of 1 A or less, so the
yes
path to box D can be followed. High performance modems which
operationally pass both Type A and B surges would need a fuse of
greater than 1 A and so follow the
no
path to box F.
The criterion for box D is a fire enclosure.
Pass
C
Y
N
F
D
Y
N
H
Few modems can afford fire enclosures. However, for an internal
modem in a known computer case, the case may be evaluated as a
fire enclosure. A successful case evaluation will give a
yes
and an
equipment pass.
More likely the modem will not have a fire enclosure. The
no
flow goes
to box H.
boxes F and J
F
Y
N
J
Y
N
Fail
The criterion for box F is a pass to clause 6.3.3 requirements.
A
yes
goes to box G and a
no
goes to box J.
The criterion for box J is to pass Test 5.
If all the three pass criteria of Test 5 are met, this is a
yes
and the flow
goes to box G.
A
no
result fails the equipment.
G
PRODUCT
8
INFORMATION
POINN [ POWER INNOVATIONS LTD ]
