BT8376EPF datasheet(156/323 Pages) CONEXANT

156 / 323 page

Bt8370/8375/8376

3.7 Receive LIU Registers

Fully Integrated T1/E1 Framer and Line Interface

3-38

Conexant

N8370DSE

3.7 Receive LIU Registers

Unused bits indicated by a dash (—) are reserved and should be written to 0. Writing to reserved bits has no

effect.

Table 3-9 details receiver LIU register settings for some typical applications. The sensitivity range values

shown are the minimum range of receive signal levels for which the receiver recovers data error-free. The

RALOS detect range lists the range of receive signal levels for which Analog Loss of Signal (RALOS) is

declared after 1 msec. The RLOS detect threshold shows the number of continuously received zeros that cause a

receiver loss of signal condition. For example, for E1 I.431 applications, the receiver declares an RALOS

condition when the receive signal level is –20 dB or less. For E1 G.775 applications, an RLOS condition is

declared if the received signal level remains less than –24 dB for 32 bit periods.

Table 3-9. Receive LIU Register Settings versus Application

Application

Sensitivity

Range

RALOS Detect

Range

RLOS Detect

Threshold

(No. of

Continuously

Received

Zeros)

Receiver LIU Register Configurations

I.431(2)

0 to –6 dB

–6 to –20 dB

––

0x41

0xB1

0x1D

0xBA

0xDA

0xA6

G.775(2)

0 to –6 dB

–9 to –35 dB

32 @–24 dB

0x41

0xB1

0x1D

0xBA

0xDA

0xA6

Long Range

0 to –34 dB

< –43 dB

32 @–43 dB

0x41

0xB1

0x34

0xBA

0xDA

0xA6

Extended Range

–20 to –48 dB

< –48 dB

32 @–48 dB

0x41

0xB1

0x3F

0xBA

0xDA

0xE6

G.775(2)

0 to –6 dB

–9 to –35 dB

100 @–24 dB

0x41

0xB1

0x1D

0xBA

0xDA

0xA6

T1.403,

PA62411

0 to –16.5 dB

––

100 @–30 dB

0x41

0xB1

0x21

0xBA

0xDA

0xA6

I.431

0 to –18 dB

–18 to –30 dB

100 @–30 dB

0x41

0xB1

0x21

0xBA

0xDA

0xA6

Long Range

0 to –34 dB

< –43 dB

100 @–43 dB

0x41

0xB1

0x34

0xBA

0xDA

0xA6

Extended Range

–20 to –48 dB

< –48 dB

100 @–48 dB

0x41

0xB1

0x3F

0xBA

0xDA

0xE6

NOTE(S):

(1) Default value.

(2) Register values shown for short-haul applications are also applicable for the Bt8375 and Bt8376 devices.

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