XRT75R03IVTR-F Exar Corporation, XRT75R03IVTR-F Datasheet - Page 89

• Manufacturer Part Number: XRT75R03IVTR-F
• Description: IC LIU E3/DS3/STS-1 3CH 128LQFP
• Manufacturer: Exar Corporation

Specifications of XRT75R03IVTR-F

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

xr
xr
xr
xr
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
The Digital Loopback function is available either in Hardware mode or Host mode. When the Digital Loopback
is selected, the transmit clock (TxClk_n) and transmit data inputs (TPDATA_n & TNDATA_n) are looped back
and output onto the RxClk_n, RPOS_n and RNEG_n pins as shown in Figure 27.
With Remote loopback activated as shown in Figure 28, the receive data on RTIP and RRING is looped back
after the jitter attenuator (if selected in receive or transmit path) to the transmit path using RxClk as transmit
timing. The receive data is also output via the RPOS and RNEG pins.
During the remote loopback mode, if the jitter attenuator is selected in the transmit path, the receive data after
the Clock and Data Recovery Block is looped back to the transmit path and passed through the jitter attenuator
using RxClk as the transmit timing.
N
F
F
9.2.2
9.2.3
OTE
IGURE
IGURE
: Input signals on TxClk, TPDATA and TNDATA are ignored during Remote loopback.
TPDATA
TNDATA
TPDATA
TNDATA
RNEG
RPOS
RNEG
RCLK
RPOS
RCLK
TCLK
TCLK
28. D
29. R
DIGITAL LOOPBACK:
REMOTE LOOPBACK:
IGITAL
EMOTE
L
1
2
Transmit path
L
1
2
Transmit path
if enabled
if enabled and selected in either Receive or
OOPBACK
if enabled
if enabled and selected in either Receive or
OOPBACK
HDB3/B3ZS
DECODER
HDB3/B3ZS
HDB3/B3ZS
HDB3/B3ZS
DECODER
ENCODER
ENCODER
1
1
1
1
86
RECOVERY
RECOVERY
CONTROL
CONTROL
DATA &
CLOCK
DATA &
CLOCK
TIMING
TIMING
Tx
Rx
Tx
Rx
XRT75R03
RTIP
TTIP
RRING
TRING
TRING
RTIP
RRING
TTIP
REV. 1.0.8