82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 46

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

3.5.3.3 Transmit LOS (TLOS)
are monitored. When the amplitude of the data is less than a certain
voltage for a certain period, TLOS is declared. The voltage is defined by
the TALOS[1:0] bits (b3~2, LOS,...). The period is defined by the
TDLOS[1:0] bits (b1~0, LOS,...). When a valid pulse is detected, i.e., the
amplitude is above the setting in the TALOS[1:0] bits (b3~2, LOS,...),
TLOS is cleared.
transition from ‘0’ to ‘1’ on the TLOS_S bit (b2, STAT0,...) or any transi-
tion (from ‘0’ to ‘1’ or from ‘1’ to ‘0’) on the TLOS_S bit (b2, STAT0,...) will
set the TLOS_IS bit (b2, INTS0,...) to ‘1’, as selected by the TLOS_IES
bit (b2, INTES,...). When the TLOS_IS bit (b2, INTS0,...) is ‘1’, an inter-
rupt will be reported by INT if not masked by the TLOS_IM bit (b2,
INTM0,...).
cated by the TMFn pin. Refer to Section 3.5.6 Error Counter and
Section 3.5.7.2 TMFn Indication respectively.
between two channels. The connection between the two channels is
shown in Figure-25. The two channels can be of the same device or
different devices on the premises that the transmit line interfaces are in
the same mode and at least the output of one channel is in High-Z state.
Table-19 lists each results in this case. In the left two columns, the OE
bit (b6, TCF0,...) of the two channels controls the output status in the
Table-19 TLOS Detection Between Two Channels
Functional Description
IDT82P2821
Note:
* The TLOS_S bit (b2, STAT0,...) may not be set if there is any catastrophic failure in the channel.
The amplitude and density of the data output on the transmit line side
When TLOS is detected, the TLOS_S bit (b2, STAT0,...) will be set. A
TLOS may be counted by an internal Error Counter or may be indi-
TLOS can be used to monitor the LOS in the transmit line side
Output Status ~ Controlled By the OE Bit
Channel #1
Normal ~ 1
Normal ~ 1
High-Z ~ 0
High-Z ~ 0
High-Z ~ 0
Channel #2
Normal ~ 1
Normal ~ 1
High-Z ~ 0
High-Z ~ 0
High-Z ~ 0
Channel #1
(don’t-care)
(don’t-care)
Normal
Normal
Failure
Internal Operation Status
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
46
transmit line side to ensure that at least one channel is in High-Z state.
The middle two columns list the internal operation status. In the right two
columns, the TLOS_S bit (b2, STAT0,...) of the two channels indicates
the TLOS status in the transmit line side.
Figure-25 TLOS Detection Between Two Channels
TRINGn
TRINGn
TTIPn
TTIPn
Channel #2
(don’t-care)
(don’t-care)
Normal
Normal
Failure
TLOS Detected ~ 1 *
TLOS Detected ~ 1
TLOS Detected ~ 1
TLOS Status ~ Indicated By the TLOS_S Bit
No TLOS ~ 0
No TLOS ~ 0
Channel #1
Driver
Driver
Line
Line
Detector
Detector
TLOS
TLOS
Channel #1
Channel #2
TLOS Detected ~ 1 *
TLOS Detected ~ 1
TLOS Detected ~ 1
February 6, 2009
No TLOS ~ 0
No TLOS ~ 0
Channel #2
TLOS
TLOS