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| 型號(hào)： | HC-5502A |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HC-5502A |
2
Case 1: HC-5502A Tip Injected Ringing
V
LA
= (I
RING
- I
TIP
) (RB4) (K)
(During Ringing I
TIP
= 0)
V
LA
= (I
RING
) (RB4) (K)
I
RING
= (V
RF
- V
RING
)/RB4
V
LA
= (V
RF
- V
RING
) K
For Case 1, refer to Figures 2 and 3. In this situation the
desired result is obtained, namely, that ring sync occurs dur-
ing the negative peak of V
C4
. This helps achieve ring trip
faster because, once a subscriber goes off-hook, a negative
DC shift is observed at V
C4
. This shift approaches a com-
parator threshold in the ring trip detection circuit. If the nega-
tive peak of V
C4
(AC) precedes the negative going DC shift
at V
C4
, one can achieve ring trip in a shorter time frame.
Also this configuration allows ring trip to occur for long lines,
in the order of 3000
. At these line lengths, the DC negative
shift will never reach the threshold because there is not
enough DC current through the sense resistor, RB4. How-
ever, the negative peak of V
C4
(AC) will cross the ring trip
detector comparator threshold and ring trip will occur.
Conclusion 1
: For this case make sure ring sync is syn-
chronized with the negative zero crossing of V
RING
as it
appears on the line.
Case 2: HC-5504 Ring Injected Ringing
V
LA
= (I
RING
- I
TIP
) (RB4) (K)
(During Ringing I
TIP
= 0)
V
LA
= (I
RING
)(RB4) (K)
I
RING
= (V
RFS
- V
RING
)/RB4
V
LA
= (V
RFS
- V
RING
) K
For Case 2 refer to Figures 4 and 5. Here ring sync must be
synchronized with the positive zero crossing of V
RING
(AC)
as it appears on the line so as to coincide with the negative
peak of V
C4
(AC), as in the previous case. One can see from
Figure 5 that ring sync on the negative zero crossing would
coincide with the positive peak of V
C4
, inhibiting ring trip for
loops greater than approximately 800
.
Conclusion 2
: For this case make sure ring sync is syn-
chronized with the positive zero crossing of V
RING
(AC.).
For all other ring configurations, namely, tip injected and bal-
anced ringing for the HC-5504, if ring sync is used, it must be
synchronized with the negative zero crossing of V
RING
(AC).
Acknowledgment
The author wishes to thank Geoff Philliips for his contribution
to this paper.
FIGURE 2.
FIGURE 3.
FIGURE 4.
FIGURE 5.
Application Note 571
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| HC-5509B | ITU CO/Loop Carrier SLIC(ITU 環(huán)路載波芯片) |
| HC1-5504DLC-5 | SLIC Subscriber Line Interface Circuit |
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| HC1-5504B-5 | EIA/ITU PABX SLIC with 40mA Loop Feed |
| HC1-5504B-9 | EIA/ITU PABX SLIC with 40mA Loop Feed |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC5502A3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HC5502A4P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HC-5502B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:EIA/ITU PABX SLIC with 30mA Loop Feed |
| HC-5502B_03 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:EIA/ITU PABX SLIC with 30mA Loop Feed |
| HC-5502B1 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:SLIC Subscriber Line Interface Circuit |
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