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參數(shù)資料
| 型號： | L9500A |
| 英文描述： | High-Voltage Ringing SLIC for VolP Applications |
| 中文描述： | 高壓振鈴用戶接口應用的福爾普 |
| 文件頁數(shù)： | 25/32頁 |
| 文件大?。?/td> | 616K |
| 代理商： | L9500A |
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Preliminary Data Sheet
September 2001
High-Voltage Ringing SLIC for VoIP Applications
L9500A
Agere Systems Inc.
25
Applications
(continued)
Figure 11. RING
IN
Operation
ac Applications
ac Parameters
There are four key ac design parameters.
Termination impedance
is the impedance looking into the 2-wire port of
the line card. It is set to match the impedance of the telephone loop in order to minimize echo return to the tele-
phone set.
Transmit gain
is measured from the 2-wire port to the PCM highway, while
receive gain
is done from
the PCM highway to the transmit port. Transmit and receive gains may be specified in terms of an actual gain, or in
terms of a transmission level point (TLP), that is the actual ac transmission level in dBm. Finally, the
hybrid bal-
ance
network cancels the unwanted amount of the receive signal that appears at the CODEC input.
GND
V
BAT
PT
+1
PR
35x
RING
INP
L9500
V
TIP
V
RING
–1
3.0 V
1.0 V
V
BAT
= –75 V
71 V
RING
INN
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