AG1110 View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
AG1110 Datasheet PDF : 10 Pages
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V2.5 April 2004
Data Sheet
Ag1110
LOW COST PBX SLIC
+5V
D1
K1
0V
C1
-48V
R2
90Vrms
To MCU
VCC
RDO
TEXAS 0GSX
TCM38C17
0ANLGIN-
0PWRO+
1GSX
1ANLGIN
1PWRO+-
2GSX
2ANLGIN
2PWRO+-
3GSX
3ANLGIN
3PWRO+-
SHK
RDI
Ag1110
LO
C3
Silver VOUT
VIN
C4
TELECOM
C6
0V
+
RT
GND
C2
VBAT
-48V
R1
D2
RING
D3
-VBAT
R5
D5
TIP
TC
D6
D4
R3
RING
R4
TIP
Components
R1 = 300R, 2W (only one needed per linecard)
R2 = PTC eg. Walsin PTD3A220H14 (one needed per
system)
R3, R4 = 25R and 350mA fuse (eg. Bussman C515)
R5 = 20k, 1/4W. Only fitted for on hook transmission
C1, C2 = 100nF, 50V, ceramic
C3, C4 = 100nF, 50V, ceramic
C6 = 1uF electrolytic
D1 = 1N4148
D2-D6 = 1N4003
K1 = Relay, 5V (or 6V), 1 form C, 120R Coil (e.g. Omron
G2E 184P-H or HKE HRS1H)
Figure 5: Ringing Application Diagram with Codec
The Ag1110 will provide on hook transmission with a
high impedance on Tip/Ring or where specific loads
are demanded by Network Operators.
3.0 Loop Current Detect Level
When the subscriber goes “off-hook”, loop current will
begin to flow. If this current is above the detection
threshold (default 10mA), the switch hook output, SHK,
will switch to a logic 1. It is recommended that
software or hardware de-bouncing of the switch hook
signal is used, to avoid short pulses due to contact
bounce, causing a false switch hook output triggering
the incorrect system response.
During loop disconnect (pulse) 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 Relay Driver
On the SLIC an open collector driver, RDO, is provided
to drive the ringing relay. This is activated by
connecting a logic 1 to RDI. The coil of the user
provided ringing relay must be connected between
RDO and a positive supply voltage (normally +5V), with
© Silver Telecom 2004
a fly back diode being fitted across the coil. Normally
the ringing generator is cadenced, and the ringing relay
will only be activated during the off period, as this
prolongs the life of the relay contacts.
5.0 Protection
In most ‘off-premise’ applications the 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 to provide primary and secondary protection
circuits to prevent damage to the SLIC.
The Ag1110 has been designed to be able to use low
cost lightning and power cross protection components,
and a typical circuit is shown in Figure 5. This circuit
will meet UL1459 and 1950 requirements.
The series element (R3 and R4) is a combination of a
fuse (e.g. 350mA, Bussman C515 or Littlefuse
220003), and a surge resistor (25R typically).
Alternatively a Teccor F1250T or F0500T fuse may be
used without a surge resistor. The lightning protection
is provided by diodes connected to 0V, and the battery
voltage. To prevent lightning surges propagating via
VBAT, this should be clamped with a Tranzorb device
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