IDT82P2288 Integrated Device Technology, Inc., IDT82P2288 Datasheet - Page 31
IDT82P2288
Manufacturer Part Number
IDT82P2288
Description
8 Channel T1/J1/E1 Transceiver
Manufacturer
Integrated Device Technology, Inc.
Datasheet
1.IDT82P2288.pdf
(384 pages)
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IDT82P2288
3.7.3
sity of the received signal. When the received signal is below an ampli-
tude for continuous intervals, the LOS is detected. When the received
signal is above the amplitude and the density of marks meets the
requirement, the LOS is cleared.
Table 9 and Table 10. In T1/J1 mode, the LOS detection supports ANSI
T1.231 and I.431. In E1 mode, the LOS detection supports ITU-T G.775
and I.431. The criteria are selected by the LAC bit.
Functional Description
The Loss of Signal (LOS) Detector monitors the amplitude and den-
The different criteria for LOS Declaring/Clearing are illustrated in
LOS DETECTION
RRINGn
RTIPn
clock
RRINGn
RTIPn
clock
1
RRINGn
RTIPn
clock
1
2
2
Figure 8. HDB3 Code Violation & Excessive Zero Error
3
1
Excessive zero
4 consecutive
zeros
2
Figure 7. B8ZS Excessive Zero Error
Figure 6. AMI Bipolar Violation Error
3
4
3
4
5
4
5
20
Bipolar violation
Excessive zero
8 consecutive
Selected by the LOS_IES bit, a transition from '0' to '1' on the LOS_S bit
or any transition (from ‘0’ to ‘1’ or from ‘1’ to ‘0’) on the LOS_S bit will set
the LOS_IS bit to ‘1’. When the LOS_IS bit is ‘1’, an interrupt will be
reported by the INT pin if enabled by the LOS_IE bit.
to the received data stream.
V
OCTAL T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
zeros
When the LOS is detected, it will be indicated by the LOS_S bit.
During LOS, if the RAISE bit is set to ‘1’, all ’One’s will be inserted
Code violation
V
6
V
5
6
7
6
7
8
9
March 22, 2004
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