DS26524DK Maxim Integrated Products, DS26524DK Datasheet - Page 79
DS26524DK
Manufacturer Part Number
DS26524DK
Description
KIT DESIGN FOR DS26524
Manufacturer
Maxim Integrated Products
Datasheet
1.DS26524G.pdf
(273 pages)
Specifications of DS26524DK
Main Purpose
Telecom, Framer and Line Interface Units (LIUs)
Utilized Ic / Part
DS26524
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Secondary Attributes
-
Embedded
-
Primary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Figure 8-14. Typical Monitor Application
8.11.3.4
The DS26524 uses both the digital and analog loss-detection method in compliance with the latest ANSI T1.231 for
T1/J1 and ITU-T G.775, or ETS 300 233 for E1 mode of operation.
Loss of signal (LOS) is detected if the receiver level falls below a threshold analog voltage for certain duration.
Alternatively, this can be termed as having received “0s” for a certain duration. The signal level and timing duration
are defined in accordance with the ANSI T1.231, ITU-T G.775, or ETS 300 233 specifications.
For short-haul mode, the loss-detection thresholds are based on cable loss of 12dB to 18dB for both T1/J1 and E1
modes. The loss thresholds are selectable based on
is based on cable loss of 30dB to 38dB for T1/J1 and 30dB to 45dB for E1 mode. Note there is no explicit bit called
short-haul mode selection. Loss declaration level is set at 3dB lower that the maximum sensitivity setting
programmed in
The loss state is exited when the receiver detects a certain ones density at the maximum sensitivity level or higher,
which is 3dB higher than the loss-detection level. The loss-detection signal level and loss-reset signal level are
defined with hysteresis to prevent the receiver from bouncing between “LOS” and “no LOS” states.
outlines the specifications governing the loss function.
Table 8-38. ANSI T1.231, ITU-T G.775, and ETS 300 233 Loss Criteria Specifications
Loss Reset
CRITERIA
Detection
Loss
No pulses are detected for 175
±75 bits.
Loss is terminated if a duration
of 12.5% ones are detected
over duration of 175 ±75 bits.
Loss is not terminated if 8
consecutive zeros are found if
B8ZS encoding is used. If
B8ZS is not used, loss is not
terminated if 100 consecutive
pulses are zero.
Table
Loss of Signal (LOS)
T1/E1 LINE
9-19.
ANSI T1.231
Rm
MONITOR
PORT JACK
Rm
No pulses are detected for
duration of 10 to 255-bit
periods.
The incoming signal has
transitions for duration of 10 to
255-bit periods.
PRIMARY
T1/E1 TERMINATING
DEVICE
79 of 273
Table
STANDARD
ITU-T G.775
9-19. For long-haul mode, the LOS detection threshold
X
F
M
R
SECONDARY T1/E1
TERMINATING
DEVICE
Rt
DS26524
No pulses are detected for a
duration of 2048-bit periods or
1ms.
Loss reset criteria are not
defined.
ETS 300 233
Table 8-38
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