XRT73LC03A Datasheet, PDF (11/61 Pages) Exar Corporation – 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

XRT73LC03A
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
CONTROL AND ALARM INTERFACE
PIN #
NAME
TYPE
31
MRing_0
I
4
MRing_1
15
MRing_2
30
MTIP_0
I
5
MTIP_1
16
MTIP_2
38
DMO_0
O
120
DMO_1
21
DMO_2
36
TAOS_0
I
6
TAOS_1
7
TAOS_2
55
RLOS_0
O
107
RLOS_1
58
RLOS_2
57
RLOL_0
O
105
RLOL_1
60
RLOL_2
56
LCV_0
O
106
LCV_1
59
LCV_2
66
ICT
I
67
LOSTHR_0
I
89
LOSTHR_1
75
LOSTHR_2
DESCRIPTION
Monitor Ring Input - Channel (n):
The bipolar line output signal from TRing_(n) can be connected to this
pin via a 270-ohm resistor in order to check for line driver failure. This
pin is internally pulled "High".
Monitor Tip Input - Channel (n):
The bipolar line output signal from TTIP_(n) can be connected to this pin
via a 270-ohm resistor in order to check for line driver failure. This pin is
internally pulled "High".
Drive Monitor Output - Channel (n):
If no transmitted AMI signal is present on MTIP_(n) and MRing_(n) input
pins for 128±32 TxClk periods, then DMO_(n) toggles and remains
"High" until the next AMI signal is detected.
Transmit All Ones Select - Channel (n):
A "High" on this pin causes the Transmit Section, within Channel (n), to
generate and transmit a continuous AMI all “1’s" pattern onto the line.
The frequency of this "1’s" pattern is determined by TxClk_(n).
This input pin is ignored if the XRT73LC03A is operating in the HOST
Mode.
NOTE: This pin should be tied to GND if the XRT73LC03A is going to be
operating in the HOST Mode, (internally pulled-down).
Receive Loss of Signal Output Indicator - Channel (n):
This output pin toggles "High" if Channel (n) has detected a Loss of Sig-
nal Condition in the incoming line signal.
The criteria that the XRT73LC03A uses to declare an LOS Condition
depends upon whether the device is operating in the E3 or STS-1/DS3
Mode.
Receive Loss of Lock Output Indicator - Channel (n):
This output pin toggles "High" if Channel (n) has detected a Loss of Lock
Condition. Channel (n) declares an LOL (Loss of Lock) Condition if the
recovered clock frequency deviates from the Reference Clock frequency
(available at the EXClk(n) input pin) by more than 0.5%.
Line Code Violation Indicator - Channel 0:
Whenever the Receive Section of Channel (n) detects a Line Code Vio-
lation, it pulses this output pin "High". This output pin remains "Low" at
all other times.
NOTE: The XRT73LC03A outputs an NRZ pulse via this output pin. It is
advisable to sample this output pin via the RxClk_(n) clock output signal.
In-Circuit Test Input:
Setting this pin "Low" causes all digital and analog outputs to go into a
high-impedance state to allow for in-circuit testing. This pin should be
set to "High" for normal operation.
This pin is internally pulled "High".
Loss of Signal Threshold Control - Channel (n):
Forcing the LOSTHR_(n) pin to GND or VDD provides two settings. This
pin must be set to a “High” or “Low” level upon power up and should not
be changed during operation.
This pin is only applicable during DS3 or STS-1 operations.
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