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Used
for digital programmable control switch-system,which
is the feeding resistance network for anti-lighting
surge,and protecting additionally local electric induction,
limit of outside current, etc.
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Used
for small digital programmable control switch-system,
including a bias circuit, a signalling circuit detector,
suspending aids and ground loop detecting. |
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Used
for small digital programmable control switch-system,
being the 4 channeled detecting loop without suspending
aids. |
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Used
for small digital programmable control switich-system,
it is main part of SLIC circuit, mainly providing with
powered AC impedance, transfering gain, common mode
limiting, grouding failure circuit limiting, TIP &
RING driving, loop circuit monitoring, etc. |
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Thick
film hybrid circuit for subscriber line interface, provide
battery, 2-4 wire conversion protection, switch hook,
on-hook reception. |
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