xrt83l30 Exar Corporation, xrt83l30 Datasheet - Page 52

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

XRT83L30
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
D3
D2
D1
D0
LOOP2
LOOP1
LOOP0
TXON
T
ABLE
20: M
Transmitter ON: Writing a "1" into this bit location turns on the
Transmit Section. A ‘0’ in this bit location, shuts off the transmit-
ter. In this mode the TTIP and TRING driver outputs will be tri-
stated for power reduction or redundancy applications.
Loop-Back control bit 2: This bit together with the LOOP1 and
LOOP0 bits control the Loop-Back modes of the chip according
to the following table:
Loop-Back control bit 1: See description of bit D2 for the func-
tion of this bit.
Loop-Back control bit 0: See description of bit D2 for the func-
tion of this bit.
ICROPROCESSOR
LOOP2
0
1
1
1
1
LOOP1
X
0
0
1
1
49
R
EGISTER
LOOP0
X
0
1
0
1
#2
No Loop-Back
Dual Loop-Back
Analog Loop-Back
Remote Loop-Back
Digital Loop-Back
BIT DESCRIPTION
Loop-Back Mode
R/W
R/W
R/W
R/W
REV. 1.0.1
0
0
0
0