xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 35
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xrt94l33
Manufacturer Part Number
xrt94l33
Description
Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
Manufacturer
Exar Corporation
Datasheet
1.XRT94L33.pdf
(465 pages)
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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
AB16
E12
E17
TxOH_0
TxOH_1
TxOH_2
I
TTL
Transmit Overhead Data Input:
This input pin functions as the “Transmit Overhead Data”
output indicator for the transmit system side interface when the
XRT94L33 is configured to operate in STS-1/DS3/E3 mode,
however, it functions as the “Transmit STS-1 Overhead
Enable” output when the device is configured to operate in the
STS-1 mode.
When configured to operate in DS3/E3 mode:
The Transmit Overhead Data Input Interface accepts overhead
via these input pins, and insert this data into the “overhead” bit
positions within the outbound DS3 or E3 frames.
“TxOHIns_n” input pin is pulled “high”, then the Transmit
Overhead Data Input Interface will sample the overhead data,
via this input pin, upon the falling edge of the TxOHClk_n
output signal.
Conversely, if the TxOHIns_n input pin is NOT pulled “high”,
then the Transmit Overhead Data Input Interface block will be
inactive and will not accept any overhead data via the TxOH_n
input pin.
When configured to operate in STS-1 mode:
These input pins permit the user to do the following.
The exact function of these input pins, depend upon whether
the user have opted to insert the TOH data into the 3 Transmit
STS-1 TOH Processor blocks, or not.
35
1.
2.
To insert the POH data into each of the 3 Transmit
STS-1 POH Processor blocks (for insertion and
transmission via each of the “outbound” STS-1
signals).
To insert the TOH data into each of the 3 Transmit
STS-1 TOH Processor blocks (for insertion and
transmission via each of the “outbound” STS-1
signals).
XRT94L33
Rev.1.2.0.
If the
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