Bt8370/8375/8376
3.7 Receive LIU Registers
Fully Integrated T1/E1 Framer and Line Interface
3
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
Receiver LIU Register Configurations
)
)
RLOS Detect
1(
1(
Threshold
(No. of
Continuously
Received
Zeros)
Sensitivity
Range
RALOS Detect
Range
Application
I.431(2)
0 to –6 dB
0 to –6 dB
0 to –34 dB
–6 to –20 dB
–9 to –35 dB
< –43 dB
––
0x41 0xB1 0x1D 0xBA 0xDA 0xA6
0x41 0xB1 0x1D 0xBA 0xDA 0xA6
G.775(2)
32 @–24 dB
Long Range
32 @–43 dB
32 @–48 dB
0x41 0xB1 0x34 0xBA 0xDA 0xA6
0x41 0xB1 0x3F 0xBA 0xDA 0xE6
Extended Range –20 to –48 dB < –48 dB
G.775(2)
0 to –6 dB
–9 to –35 dB
100 @–24 dB
100 @–30 dB
0x41 0xB1 0x1D 0xBA 0xDA 0xA6
0x41 0xB1 0x21 0xBA 0xDA 0xA6
T1.403,
0 to –16.5 dB ––
PA62411
I.431
0 to –18 dB
0 to –34 dB
–18 to –30 dB
< –43 dB
100 @–30 dB
100 @–43 dB
100 @–48 dB
0x41 0xB1 0x21 0xBA 0xDA 0xA6
0x41 0xB1 0x34 0xBA 0xDA 0xA6
0x41 0xB1 0x3F 0xBA 0xDA 0xE6
Long Range
Extended Range –20 to –48 dB < –48 dB
NOTE(S):
(1)
Default value.
Register values shown for short-haul applications are also applicable for the Bt8375 and Bt8376 devices.
(2)
3-38
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
