參數(shù)資料
型號(hào)： XRT75R12IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述： DATACOM, PCM TRANSCEIVER, PBGA420
封裝： 35 X 35 MM, TBGA-420
文件頁數(shù)： 8/89頁
文件大?。?/td> 457K
代理商： XRT75R12IB
XRT75R12
REV. P1.0.2
PRELIMINARY
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
5
C23
AD23
D19
AC19
D15
AC15
E11
AB11
E8
AB8
C4
AD4
MTip0
MTip1
MTip2
MTip3
MTip4
MTip5
MTip6
MTip7
MTip8
MTip9
MTip10
MTip11
I
Monitor Tip Input - Positive Polarity Signal
These input pins along with MRing_n function as the Transmit Drive Monitor Out-
put (DMO) input monitoring pins. (1) To monitor the Transmit Output line signal
and (2) to perform this monitoring externally, then this pin MUST be connected to
the corresponding TTIP_n output pin via a 270
series resistor. Similarly, the
MRING_n input pin MUST also be connected to its corresponding TRING_n out-
put pin via a 270
series resistor.
The MTIP_n and MRING_n input pins will continuously monitor the Transmit
Output line signal via the TTIP_n and TRING_n output pins for bipolar activity. If
these pins do not detect any bipolar activity for 128 bit periods, then the Transmit
Drive Monitor circuit will drive the corresponding DMO_n output pin "High" in
order to denote a possible fault condition in the Transmit Output Line signal path.
N
OTE
:
These input pins are inactive if the user chooses to internally
monitor the Transmit Output line signal.
D23
AC23
E19
AB19
E16
AB16
D10
AC10
D8
AC8
D4
AC4
MRing0
MRing1
MRing2
MRing3
MRing4
MRing5
MRing6
MRing7
MRing8
MRing9
MRing10
MRing11
I
Monitor Ring Input
These input pins along with MTIP_n function as the Transmit Drive Monitor Out-
put (DMO) input monitoring pins. (1) To monitor the Transmit Output line signal
and (2) to perform this monitoring externally, then this input pin MUST be con-
nected to the corresponding TRING_n output pin via a 270
series resistor. Simi-
larly, the MTIP_n input pin MUST be connected to its corresponding TTIP_n
output pin via a 270
series resistor.
The MTIP_n and MRING_n input pins will continuously monitor the Transmit
Output line signal via the TTIP_n and TRING_n output pins for bipolar activity. If
these pins do not detect any bipolar activity for 128 bit periods, then the Transmit
Drive Monitor circuit will drive the corresponding DMO_n output pin "High" to
indicate a possible fault condition in the Transmit Output Line signal path.
N
OTE
:
These input pins are inactive if the user chooses to internally
monitor the Transmit Output line signal.
N3
N4
N5
N1
M1
L2
M2
M3
M4
M5
K2
J1
DMO0
DMO1
DMO2
DMO3
DMO4
DMO5
DMO6
DMO7
DMO8
DMO9
DMO10
DMO11
O
Drive Monitor Output
These output signals are used to indicate a fault condition within the
Transmit Output signal path.
This output pin will toggle "High" anytime the Transmit Drive Monitor cir-
cuitry either, via the corresponding MTIP and MRING input pins or inter-
nally, detects no bipolar pulses via the Transmit Output line signal (e.g., via
the TTIP_m and TRING_m output pins) for 128 bit-periods.
This output pin will be driven "Low" anytime the Transmit Drive Monitor cir-
cuitry has detected at least one bipolar pulse via the Transmit Output line
signal within the last 128 bit periods.
SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS
P
IN
#
S
IGNAL
N
AME
T
YPE
D
ESCRIPTION
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