DS26521 datasheet(75/258 Pages) MAXIM

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DS26521 Single T1/E1/J1 Transceiver

75 of 258

8.11.3.5

ANSI T1.231 for T1 and J1 Modes

For short-haul mode, loss is declared if the received signal level is 3dB lower from the programmed value (based

on Table 9-19) for a duration of 192-bit periods. Hence, if the sensitivity is programmed to be 12dB, loss will be

declared at 15dB. LOS is reset if the following criteria are met:

1) 24 or more ones are detected in 192-bit period with a programmed sensitivity level measured at RTIP and

RRING.

2) During the 192 bits, fewer than 100 consecutive zeros are detected.

For long-haul mode, loss is detected if the received signal level is 3dB lower from the programmed value (based on

Table 9-19) for a duration of 192-bit periods. Hence, if the sensitivity is programmed at 30dB, loss declaration level

will be 33dB. LOS is reset if the following criteria are met:

1) 24 or more ones are detected in 192-bit period with a programmed sensitivity level measured at RTIP and

RRING.

2) During the 192 bits, fewer than 100 consecutive zeros are detected.

8.11.3.6

ITU-T G.775 for E1 Modes

For short-haul mode, loss is declared if the received signal level is 3dB lower from the programmed value (based

on Table 9-19) for a duration of 192-bit periods. Hence, if the sensitivity is programmed to be 12dB, loss will be

declared at 15dB. LOS is reset if the receive signal level is greater than or equal to the programmed sensitivity

level for a duration of 192-bit periods.

For long-haul mode, loss is detected if the received signal level is 3dB lower from the programmed value (based on

Table 9-19) for a duration of 192-bit periods. Hence, if the sensitivity is programmed at 30dB, loss declaration level

will be 33dB. LOS is reset if the receive signal level is greater than or equal to the programmed sensitivity level for

a duration of 192-bit periods.

8.11.3.7

ETS 200 233 for E1 Modes

For short-haul mode, loss is declared if the received signal level is 3dB lower from the programmed value (based

on Table 9-19) continuous duration of 2048-bit periods (1ms). LOS is reset if the receive signal level is greater than

or equal to programmed sensitivity level for a duration of 192-bit periods.

For long-haul mode, loss is declared if the received signal level is 3dB lower from the programmed value (based on

Table 9-19) continuous duration of 2048-bit periods (1ms). LOS is reset if the receive signal level is greater than or

equal to the programmed sensitivity level for a duration of 192-bit periods.

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