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XRT83VSH316 Datasheet(PDF) 8 Page - Exar Corporation

Part # XRT83VSH316
Description  16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT83VSH316 Datasheet(HTML) 8 Page - Exar Corporation

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XRT83VSH316
PRELIMINARY
6
16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. P1.0.3
RECEIVER SECTION
NAME
PIN
TYPE
DESCRIPTION
RxON
Y16
I
Receive On/Off Input
Upon power up, the receivers are powered off. Turning the receivers On or Off
can be selected through the microprocessor interface by programming the
appropriate channel register if the hardware pin is pulled "High". If the hard-
ware pin is pulled "Low", all channels are automatically turned off.
NOTE: Internally pulled "Low" with a 50K
Ω resistor.
RxTSEL
A16
I
Receive Termination Control
Upon power up, the receivers are in "High" impedance. Switching to internal
termination can be selected through the microprocessor interface by program-
ming the appropriate channel register. However, to switch control to the hard-
ware pin, RxTCNTL must be programmed to "1" in the appropriate global
register. Once control has been granted to the hardware pin, it must be pulled
"High" to switch to internal termination.
NOTE: Internally pulled "Low" with a 50k
Ω resistor.
RLOS
T4
O
Receive Loss of Signal (Global Pin for All 16-Channels)
When a line side receive loss of signal occurs for any one of the 16-channels
according to ITU-T G.775, the RLOS pin will go "High" for a minimum of one
RCLK cycle. RLOS will remain "High" until the loss of signal condition clears.
See the Receive Loss of Signal section of this datasheet for more details.
NOTE: This pin is for redundancy applications to initiate an automatic switch to
the backup card. For individual channel RLOS, see the register map.
SRLOS
T5
O
System Receive Loss of Signal (Global Pin for All 16-Channels)
When a system side receive loss of signal occurs for any one of the 16-chan-
nels according to ITU-T G.775, the SRLOS pin will go "High" for a minimum of
one TCLK cycle. SRLOS will remain "High" until the loss of signal condition
clears. See the Receive Loss of Signal section of this datasheet for more
details.
RxTSEL (pin)
Rx Termination
External
Internal
0
1
Note: RxTCNTL (bit) must be set to "1"


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