XRT83SL28
xr
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
TABLE 2: TIMING SPECIFICATIONS FOR RCLK/RPOS/RNEG
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
RCLK Rise Time (10% to 90%)
with 25pF Loading
RCLKR
-
-
40
ns
RCLK Fall Time (90% to 10%)
with 25pF Loading
RCLKF
-
-
40
ns
NOTE: VDD=3.3V ±5%, TA=25°C, Unless Otherwise Specified
1.4
Receive Sensitivity
To meet short haul requirements, the XRT83SL28 can accept E1 signals that have been attenuated by 9dB of
cable loss in E1 mode. The test configuration for measuring the receive sensitivity is shown in Figure 8.
FIGURE 8. TEST CONFIGURATION FOR MEASURING RECEIVE SENSITIVITY
W&G ANT20
Rx
Tx
External Loopback
Tx
Cable Loss
XRT83SL28
8-Channel
Short Haul LIU
Network
Analyzer
Rx
E1 = PRBS 215 - 1
1.5
General Alarm Detection and Interrupt Generation
The receive path detects RLOS and AIS. These alarms can be individually masked to prevent the alarm from
triggering an interrupt. To enable interrupt generation, the Global Interrupt Enable (GIE) bit must be set "High"
in the appropriate global register. Any time a change in status occurs (if the alarms are enabled), the interrupt
pin will pull "Low" to indicate an alarm has occurred. Once the status registers have been read, the INT pin will
return "High". The status registers are Reset Upon Read (RUR).
NOTE: The interrupt pin is an Open-Drain output that requires a 10kΩ pull-up resistor.
16
EXAR [ EXAR CORPORATION ]
