DS26514G Maxim Integrated, DS26514G Datasheet - Page 93

• Manufacturer Part Number: DS26514G
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS26514G

• Part # Aliases: 90-26514-G00

Figure 9-25. Typical Monitor Application
9.12.3.5
The DS26514 uses both the digital and analog loss-detection method in compliance with the latest T1.231 for
T1/J1 and ITU-T G.775 or ETS 300 233 for E1 mode of operation.
LOS is detected if the receiver level falls bellow a threshold analog voltage for certain duration. Alternatively, this
can be termed as having received “zeros” for a certain duration. The signal level and timing duration are defined in
accordance with the T1.231 or 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 than 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.
19-5856; Rev 4; 5/11
Table
Loss of Signal
T1/E1 LINE
10-23.
Rm
MONITOR
PORT JACK
Rm
PRIMARY
T1/E1 TERMINATING
DEVICE
Table 10-23.
X
F
M
R
For long-haul mode, the LOS-detection threshold
SECONDARY T1/E1
TERMINATING
DEVICE
Rt
DS26514 4-Port T1/E1/J1 Transceiver
DS2651x
Table 9-42
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