IDT82P20416 Integrated Device Technology, IDT82P20416 Datasheet - Page 36

• Manufacturer Part Number: IDT82P20416
• Description: 16-channel Short Haul T1/e1/j1 Line Interface Unit
• Manufacturer: Integrated Device Technology

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,...).
Section 3.5.6 Error Counter.
between two channels. The connection between the two channels is
shown in Figure-18. 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
transmit line side to ensure that at least one channel is in High-Z state.
Table-19 TLOS Detection Between Two Channels
Functional Description
IDT82P20416
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. Refer to
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
36
16-CHANNEL SHORT HAUL T1/E1/J1 LINE INTERFACE UNIT
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-18 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
December 17, 2009
TLOS Detected ~ 1 *
TLOS Detected ~ 1
TLOS Detected ~ 1
No TLOS ~ 0
No TLOS ~ 0
Channel #2
TLOS
TLOS