82V2044BB IDT, Integrated Device Technology Inc, 82V2044BB Datasheet - Page 23

• Manufacturer Part Number: 82V2044BB
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2044BB

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

2.13.6 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-15). 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
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 four 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
IDT82V2044
Functional Description
Inband Loopback is a function that facilitates the system remote
The detection of Inband Loopback Code is enabled by bit LBDE in
The Inband Loopback Code Generator use the same registers as the
RRINGn
TRINGn
RTIPn
TTIPn
Detector
Peak
Figure-19 TAOS with Analog Loopback
Driver
Line
Slicer
Detector
LOS
CLK&Data
Recovery
23
(DPLL)
Waveform
are configured properly. The required sequence for configuring the
Inband Loopback Generator is: First, set registers e-LBAC and e-LBDC,
followed by register e-LBCF. Then, to select the Inband Loopback
generator set registers e-LBGS and then e-LBGE.
tion can not be used simultaneously.
interrupts):
2.14 G.772 MONITORING
regular transceivers. In applications using only three channels (channels
1 to 3), channel 0 is configured to non-intrusively monitor any of the
other channels’ inputs or outputs on the line side. The monitoring is non-
intrusive per ITU-T G.772.
The receive path or transmit path to be monitored is configured by pins
MC[3:0] in hardware mode or by register PMON in host mode.
circuit of channel 0. The monitored clock can output on RCLK0 which
can be used as a timing interfaces derived from E1 signal. The moni-
Transmit
All Ones
Shaper
The Inband Loopback Detection and the Inband Loopback Genera-
Example: 5-bit Loop-up/Loop-down Detection (w/o interrupts):
(see note in register description for e-LBAC)
Set (in this order)
Example: 5-bit Loop-up/Loop-down Activation on Channel 1 (w/o
Set (in this order)
The four channels of IDT82V2044 can all be configured to work as
The monitored signal goes through the clock and data recovery
One of Four Identical Channels
QUAD T1/E1 SHORT HAUL LINE INTERFACE UNIT
Loop-up code: 11000
Loop-down code: 11100
e-LBAC (0x09) = 0xC6 (11000110)
e-LBDC (0x0A) = 0xE7 (11100111)
e-LBCF (0x08) = 0x30
Loop-up code: 11000
Loop-down code: 11100
e-LBAC (0x09) = 0xC6 (11000110)
e-LBDC (0x0A) = 0xE7 (11100111)
e-LBCF (0x08) = 0x00
e-LBGS (0x0E) = 0x00
e-LBGE (0x0F) = 0x02
Attenuator
Jitter
HDB3/AMI
Figure-20
HDB3/AMI
Encoder
Decoder
B8ZS/
B8ZS/
shows the Monitoring Principle.
September 22, 2005
BPVIn/TDNn
LOSn
RDn/RDPn
CVn/RDNn
RCLKn
TCLKn
TDn/TDPn