82V2081PPG8 IDT, Integrated Device Technology Inc, 82V2081PPG8 Datasheet - Page 28

• Manufacturer Part Number: 82V2081PPG8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2081PPG8

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Compliant

SINGLE CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
3.8.4
is configured in Inband Loopback mode. In this mode, an unframed activate/
Deactivate Loopback Code is generated repeatedly in transmit direction
per ANSI T1. 403 which overwrite the transmit signals. In receive direction,
the framed or unframed code is detected per ANSI T1. 403, even in the pres-
ence of 10
(MAINT1, 0EH) to ‘1’, the chip will establish/demolish the Remote Loop-
back based on the reception of the Activate Loopback Code/Deactivate
Loopback Code for 5.1 s. If the ARLP bit (MAINT1, 0EH) is set to ‘0’, the
Remote Loopback can also be demolished forcedly.
3.8.4.1 Transmit Activate/Deactivate Loopback Code
defined by the TIBLB[7:0] bits (MAINT3, 10H). Whether the code repre-
sents an Activate Loopback Code or a Deactivate Loopback Code is judged
by the far end receiver. The length of the pattern ranges from 5 bits to 8 bits,
as selected by the TIBLB_L[1:0] bits (MAINT2, 0FH). The pattern can be
programmed to 6-bit-long or 8-bit-long by repeating itself respectively if it
is 3-bit-long or 4-bit-long. When the PATT[1:0] bits (MAINT0, 0DH) are set
to ‘11’, the transmission of the Activate/Deactivate Loopback Code is initi-
ated. If the PATT_CLK bit (MAINT0, 0DH) is set to ‘0’ and the PATT[1:0]
bits (MAINT0, 0DH) are set to ‘00’, the transmission of the Activate/Deac-
tivate Loopback Code will stop.
as the receive code setting in the remote end. It is the same thing for the
other way round.
3.8.4.2 Receive Activate/Deactivate Loopback Code
RIBLBA[7:0] bits (MAINT4, 11H). The length of this pattern ranges from 5
bits to 8 bits, as selected by the RIBLBA_L [1:0] bits (MAINT2, 0FH). The
pattern can be programmed to 6-bit-long or 8-bit-long respectively by
repeating itself if it is 3-bit-long or 4-bit-long.
RIBLBD[7:0] bits (MAINT5, 12H). The length of the receive Deactivate
Loopback Code ranges from 5 bits to 8 bits, as selected by the
RIBLBD_L[1:0] bits (MAINT2, 0FH). The pattern can be programmed to 6-
When PATT[1:0] bits (MAINT0, 0DH) are set to ‘11’, the IDT82V2081
If the Automatic Remote Loopback is enabled by setting ARLP bit
The pattern of the transmit Activate/Deactivate Loopback Code is
The local transmit activate/deactivate code setting should be the same
The pattern of the receive Activate Loopback Code is defined by the
The pattern of the receive Deactivate Loopback Code is defined by the
INBAND LOOPBACK
-2
bit error rate.
28
bit-long or 8-bit-long respectively by repeating itself if it is 3-bit-long or 4-
bit-long.
for more than 30 ms (in E1 mode) / 40 ms (in T1/J1 mode), the IBLBA_S
bit (STAT0, 17H) will be set to ‘1’ to declare the reception of the Activate
Loopback Code.
data for more than 30 ms (In E1 mode) / 40 ms (In T1/J1 mode), the IBLBD_S
bit (STAT0, 17H) will be set to ‘1’ to declare the reception of the Deactivate
Loopback Code.
sition of the IBLBA_S bit will generate an interrupt and set the IBLBA_IS bit
(INTS0, 19H) to ‘1’. When the IBLBA_IES bit is set to ‘1’, any changes of
the IBLBA_S bit will generate an interrupt and set the IBLBA_IS bit (INTS0,
19H) to ‘1’. The IBLBA_IS bit will be reset to ‘0’ after being read.
sition of the IBLBD_S bit will generate an interrupt and set the IBLBD_IS
bit (INTS0, 19H) to ‘1’. When the IBLBD_IES bit is set to ‘1’, any changes
of the IBLBD_S bit will generate an interrupt and set the IBLBD_IS bit
(INTS0, 19H) to ‘1’. The IBLBD_IS bit will be reset to ‘0’ after being read.
3.8.4.3 Automatic Remote Loopback
ured into the Automatic Remote Loopback mode. In this mode, if the Acti-
vate Loopback Code has been detected in the receive data for more than
5.1 s, the Remote Loopback (shown as Figure-15) will be established auto-
matically, and the RLP_S bit (STAT1, 18H) will be set to ‘1’ to indicate the
establishment of the Remote Loopback. The IBLBA_S bit (STAT0, 17H) is
set to ‘1’ to generate an interrupt. In this case, the Remote Loopback mode
will still be kept even if the receiver stop receiving the Activate Loopback
Code.
for more than 5.1 s, the Remote Loopback will be demolished automatically,
and the RLP_S bit (STAT1, 18H) will set to ‘0’ to indicate the demolishment
of the Remote Loopback. The IBLBD_S bit (STAT0, 17H) is set to ‘1’ to gen-
erate an interrupt.
ARLP bit (MAINT1, 0EH) to ‘0’.
After the Activate Loopback Code has been detected in the receive data
After the Deactivate Loopback Code has been detected in the receive
When the IBLBA_IES bit (INTES, 16H) is set to ‘0’, only the ‘0’ to ‘1’ tran-
When the IBLBD_IES bit (INTES, 16H) is set to ‘0’, only the ‘0’ to ‘1’ tran-
When ARLP bit (MAINT1, 0EH) is set to ‘1’, the IDT82V2081 is config-
If the Deactivate Loopback Code has been detected in the receive data
The Remote Loopback can also be demolished forcedly by setting
TEMPERATURE RANGES
INDUSTRIAL