xrt83l30 Exar Corporation, xrt83l30 Datasheet - Page 22

• Manufacturer Part Number: xrt83l30
• Description: Xrt83l30 -single-channel T1/e1/j1 Long-haul, Short-haul Line Interface Unit
• Manufacturer: Exar Corporation

F
XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
RECEIVE MONITOR MODE
In applications where Monitor mode is desired, the equalizer can be configured in a gain mode which handles
input signals attenuated resistively up to 29dB, along with 0 to 6dB cable attenuation for both T1 and E1
applications, refer to
RECEIVER LOSS OF SIGNAL (RLOS)
For compatibility with ITU G.775 requirements, the RLOS monitoring function is implemented using both
analog and digital detection schemes. If the analog RLOS condition occurs, a digital detector is activated to
count for 32 consecutive zeros in E1 (4096 bits in Extended Los mode, EXLOS = “1”) or 175 consecutive zeros
in T1 before RLOS is asserted. RLOS is cleared when the input signal rises +3dB (built in hysteresis) above
the point at which it was declared and meets 12.5% ones density of 4 ones in a 32 bit window, with no more
than 16 consecutive zeros for E1. In T1 mode, RLOS is cleared when the input signal rises +3dB (built in
hysteresis) above the point at which it was declared and contains 16 ones in a 128 bit window with no more
than 100 consecutive zeros in the data stream. When loss of signal occurs, RLOS register indication and
register status will change. If the RLOS register enable is set high (enabled), the alarm will trigger an interrupt
causing the interrupt pin (INT) to go low. Once the alarm status register has been read, it will automatically
reset upon read (RUR), and the INT pin will return high.
Analog RLOS
Setting the Receiver Input to -15dB T1/E1 Short Haul Mode
By setting the receiver input to -15dB T1/E1 short haul mode, the equalizer will detect the incoming amplitude
and make adjustments by adding gain up to a maximum of +15dB normalizing the T1/E1 input signal.
N
Once the T1/E1 input signal has been normalized to 0dB by adding the maximum gain (+15dB), the receiver
will declare RLOS if the signal is attenuated by an additional -9dB. The total cable loss at RLOS declaration is
typically -24dB (-15dB + -9dB). A 3dB hysteresis was designed so that transients will not trigger the RLOS to
clear. Therefore, the RLOS will typically clear at a total cable attenuation of -21dB. See
simplified diagram.
Setting the Receiver Input to -29dB T1/E1 Gain Mode
By setting the receiver input to -29dB T1/E1 gain mode, the equalizer will detect the incoming amplitude and
make adjustments by adding gain up to a maximum of +29dB normalizing the T1/E1 input signal.
N
IGURE
OTE
OTE
: This setting refers to cable loss (frequency), not flat loss (resistive).
: This is the only setting that refers to flat loss (resistive). All other modes refer to cable loss (frequency).
6. S
IMPLIFIED
+3dB
Table 5
D
IAGRAM OF
-9dB
for details. This feature is available in both Hardware and Host modes.
-15dB T1/E1 S
+3dB
HORT
19
H
-9dB
AUL
M
ODE AND
Clear LOS
Declare LOS
Declare LOS
Clear LOS
Norm alized up to +15dB Max
Norm alized up to +15dB Max
RLOS C
ONDITION
Figure 6
REV. 1.0.1
for a