82V2048SBB IDT, Integrated Device Technology Inc, 82V2048SBB Datasheet - Page 24

• Manufacturer Part Number: 82V2048SBB
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2048SBB

• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

IDT82V2048S OCTAL T1/E1 SHORT HAUL LIU WITH SINGLE ENDED OPTION
2.17.6 INBAND LOOPBACK
diagnosis. When this function is enabled, the chip will detect or generate
the Inband Loopback Code. There are two kinds of Inband Loopback
Code: Activate Code and Deactivate Code. If the Activate Code is
received from the far end in a continuous 5.1 second, the chip will auto-
matically go into Remote Loopback Mode (shown in Figure-16). If the
Deactivate Code is received from the far end in a continuous 5.1
second, the chip quits from the Remote Loopback mode. The chip can
send the Activate Code and Deactivate Code to the far end. Two func-
tion blocks: IBLC Detector (Inband Loopback Code Detector) and IBLC
Generator (Inband Loopback Code Generator), realize the Inband Loop-
back.
register e-LBCF. If bit ALBE in register e-LBCF is set to ‘1’, the chip will
automatically go into or quit from the Remote Loopback mode based on
the receipt of Inband Loopback Code. The length of the Activate Code is
defined in bits LBAL[1:0] in register e-LBCF; and the length of the Deac-
tivate Code is defined in bits LBDL[1:0] in register e-LBCF. The pattern
Inband Loopback is a function that facilitates the system remote
The detection of Inband Loopback Code is enabled by bit LBDE in
RRINGn
TRINGn
RTIPn
RRINGn
TRINGn
TTIPn
RTIPn
TTIPn
Detector
Peak
Driver
Detector
Line
Peak
Slicer
Figure-20 TAOS with Analog Loopback
Figure-19 TAOS with Digital Loopback
Driver
Line
Slicer
Waveform
Transmit
All Ones
Shaper
CLK&Data
Recovery
(DPLL)
Detector
Detector
LOS
LOS
CLK&Data
Recovery
24
(DPLL)
Waveform
of the Activate Code is defined in register e-LBAC, and the pattern of
the Deactivate Code is defined in register e-LBDC. The above settings
are globally effective for all the eight channels. The presence of Inband
Loopback Code in each channel is reflected timely in register e-LBS.
Any transition of each bit in register e-LBS will be reflected in register e-
LBI, and if enabled in register e-LBM, will generate an interrupt. The
required sequence of programming the Inband Loopback Code detec-
tion is: First, set registers e-LBAC and e-LBDC, followed by register e-
LBM. Finally, to activate Inband Loopback detection, set register e-
LBCF.
Inband Loopback Detector to define the length and pattern of Activate
Code and Deactivate Code. The length and pattern of the generated
Activate Code and Deactivate Code can be different from the detected
Activate Code and Deactivate Code. Register e-LBGS determines
sending Activate Code or Deactivate Code, and register e-LBGE acts as
a switch to start or stop the sending of Inband Loopback Code to the
selected channels. Before sending Inband Loopback Code, users
should be sure that registers e-LBCF, e-LBAC, e-LBDC and e-LBSG
Transmit
All Ones
Shaper
The Inband Loopback Code Generator use the same registers as the
One of Eight Identical Channels
One of Eight Identical Channels
Attenuator
Attenuator
Jitter
Jitter
Attenuator
Jitter
INDUSTRIAL TEMPERATURE RANGES
HDB3/AMI
HDB3/AMI
HDB3/AMI
Decoder
Encoder
HDB3/AMI
Encoder
B8ZS/
B8ZS/
Decoder
B8ZS/
B8ZS/
BPVIn/TDNn
LOSn
RCLKn
TDn/TDPn
RDn/RDPn
CVn/RDNn
TCLKn
LOSn
RCLKn
TDn/TDPn
BPVIn/TDNn
RDn/RDPn
CVn/RDNn
TCLKn