CLP30-200B1

Technical information

9/15

voltage during the speech mode and also assumes a residual power overvoltage

suppression. This stage can be either a fixed or programmable device such as

LCP1511D.

2.2.3

Ringing mode

Figure 16.

Switching by voltage during ringing mode

In ringing mode (ring relay in position 2), the only protection device involved is the CLP30-

200B1.

In normal conditions, the CLP30-200B1 operates in region 1 of A1 curve, and is idle.

If an overvoltage occurring between TIP (or RING) and GND reaches the internal

overvoltage reference (+/- 200 V), the CLP30-200B1 acts and the line is short-circuited to

GND. At this time the operating point moves to region 2 for positive surges (region 3 for

negative surges). Once the surge current disappears, the device returns to its initial state

(region 1).

For surges occurring between TIP and RING, the CLP30-200B1 acts in the same way. This

means that the CLP30-200B1 ensures a tripolar protection.

When used alone, the CLP30-200B1 acts at the internal overvoltage reference level

(+/- 200V). Furthermore, it is possible to adjust this threshold level to a lower voltage by

Overvoltage

detector

Overcurrent

detector

OR

TIPL

TIPS

1/2 CLP200M

GND

SW1

1

2

2

1

1

3

- 200

+ 200

TIP

Overvoltage

reference

(> 200 V)

A1