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參數資料
| 型號： | AG1460PD |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | QUAD 5V RINGING SLIC |
| 中文描述： | 四5V的振鈴用戶接口 |
| 文件頁數： | 8/15頁 |
| 文件大?。?/td> | 264K |
| 代理商： | AG1460PD |
V1.4 May 2004
Data Sheet
Ag1460
QUAD 5V RINGING SLIC
If F/R is held at logic 1 (forward) the d.c. voltage at Tip
is positive with respect to Ring. If F/R is taken to logic
0 the voltage polarity is reversed. The F/R pin should
not be left floating, and if not used should be tied high.
2.5 On Hook Transmission.
The Ag1460 is capable of on-hook transmission. This
means analog signals can be transmitted from V
in
through Tip and Ring and onto the line even when no
loop current is flowing. This can be used when
sending Caller Line Identification (CLI) information or
for other “no ring” calls.
The Ag1460 will provide on hook transmission with a
high impedance on Tip/Ring or where specific loads
are demanded by Network Operators.
3.0 Switch Hook Detect Level
When the subscriber goes “off-hook” loop current will
begin to flow. If this current is above the detection
threshold (10mA) the switch hook output, SHK, will
switch to logic 1. It is recommended that software or
hardware de-bouncing of the switch hook signal is
used. This is to avoid short pulses due to contact
bounce, which can cause a false switch hook output,
triggering the incorrect system response.
During loop disconnect dialling; SHK will pulse
between logic 1 and logic 0 to indicate the digits being
dialled. Again it is recommended that software de-
bouncing is used to avoid false detection of digits.
4.0 Protection of the Ag1460 SLIC
4.1 Thermal Protection
Should any SLIC be operated incorrectly, for example
by accidentally shorting Tip and Ring to each other or
to ground, there is a danger the power dissipation
could exceed the maximum rating. In this case a
thermal cut-off will ensure the device gradually powers
down safely by reducing the loop current. Once the
problem has been corrected the loop current will return
to its normal level.
This feature means that the SLIC can be used even
when a thermal overload has occurred.
4.2 Lightning and Power Cross Protection.
It is usual for the Ag1460 to be used in “on-premise”
applications, such as SOHO, CTI and VoIP. In this
case power cross and lightning protection is not
required, however in most ‘off-premise’ applications, a
subscriber circuit will be required to withstand over
voltage conditions which could be caused by lightning
or overhead power cables striking the telephone
cables. It is therefore normal in “off-premise”
The Codec manufacturer can provide information on
how Codec programming is done. Programmable
Codecs require information about the transfer
characteristics of the SLIC with which they are working,
which is contained in a .CIR netlist. A .CIR netlist can
be obtained by contacting either Silver Telecom or your
local representative, to allow the Codec programming
coefficients to be generated.
If a simple (non-programmable) Codec is being used,
the Ag1460P provides programming of Zin through
hardware. The input impedance, Zin, of the SLIC can
be set to the required value by connecting the
appropriate impedance across pins ZT
1
and ZT
2
. The
scaling factor is 250 so a resistor of value 150kohms
will give an impedance of 600R tip to ring.
In this way the requirements of many countries may be
met with one common linecard layout. Different values
of the ZT components are only parts requiring change.
Typical combinations are shown in table 1.
2.2 Network Balance Impedance.
The network balance impedance, Zb, of each SLIC is
set to 600
for the standard Ag1460. For countries
where the network balance impedance is 600
e.g.
North America, no external adjustment is required. For
countries where an alternative network balance
impedance is used the Codec filter characteristics can
be programmed to give the required matching. The
.CIR netlist is again needed to allow the Codec
programming coefficients to be generated.
If a simple Codec is being used the Ag1460P is
available, providing programming of ZB through
hardware. The network balance impedance, ZB, of the
SLIC is set to the required value by connecting the
appropriate impedance between pins V
IN
and ZB.
Where the input and balance impedances are the
same, a resistor value of 300k should be used with a
100pF capacitor in a “T” configuration as shown in
Table 1. Where the impedances are different, then no
simple relationship exists.
Some typical examples are shown in Table 1. For
countries which are not shown, please contact Silver
Telecom.
2.3 Transmit and Receive Gain.
The gain in both the transmit direction (Tip/Ring to
V
OUT
) and the receive direction (V
IN
to Tip/Ring) is set to
0dB. Normally any gain adjustments required by the
user can be made by programming the Codec.
2.4 Tip & Ring Polarity Reversal.
The Ag1460 can reverse the battery voltage polarity at
Tip and Ring via the F/R pin.
Silver Telecom 2004
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