T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
8 Device Operation Control (continued)
8.1 Device Operation Register (continued)
Table 46. Reserved 1: Reserved Register for Internal Use (0x55)
Reg
R/W
R
Bit 7
—
Bit 6
—
Bit 5
—
Bit 4
—
Bit 3
—
Bit 2
—
Bit 1
—
Bit 0
—
Reserved1
RESET
Default
—
—
—
—
—
—
—
—
Bit #
Symbol
Name/Description
Reserved Register for Internal Use.
7—0
—
Table 47. Reserved 2: Reserved Register for Internal Use (0x56)
Reg
R/W
R/W
Bit 7 Bit 6
Bit 5
U_FDEACT
0
Bit 4
U_R54T
1
Bit 3
Bit 2 Bit 1 Bit 0
Reserved2
RESET
—
—
—
—
MLSE_POWER_DN
0
—
—
—
—
—
—
Default
Bit #
7—6
5
Symbol
—
Name/Description
Reserved for Internal Use.
U-Interface Force Deactivation. When the NTN device is in LT mode
U_FDEACT
[DOCR(NT_LT=1)], setting this bit to 1 forces the NTN device to send three or
four U superframes of dea = 0 and then switch the transceiver off.
When the NTN device is in NT mode, this bit has no effect.
4
U_R54T
Transmit Reserved Bit. When the NTN device is in LT mode [DOCR(NT_LT=1)],
this bit is sent as the R54 reserved bit.
When the NTN device is in NT mode, this bit has no effect.
3
Maximum Likelihood Sequence Estimation, Powerdown. This bit, when set to
1, powers down the MLSE algorithm in the T9000 device, thereby providing a
power savings of approximately 15 mW, but the T9000 device does not pass the
ETSI performance test on loop3 (and loop3 reversed) with +2.5 dB noise level,
when this bit is set to 1.
MLSE_POWER_DN
Thus, this bit needs to be set to 0 to pass the ETSI performance test on loop3
(and loop3 reversed) with +2.5 dB noise level.
Note: When setting this bit to 1, care must be taken to not change the other bit
values in this register. The user must perform a read, modify, and write
operation when changing this bit value, to make sure other bit values are
unchanged.
2—0
—
Reserved for Internal Use.
Table 48. Reserved 3: Reserved Register for Internal Use (0x57)
Reg
R/W
R
Bit 7
—
Bit 6
—
Bit 5
—
Bit 4
—
Bit 3
—
Bit 2
—
Bit 1
—
Bit 0
—
Reserved3
RESET
Default
—
—
—
—
—
—
—
—
Bit #
Symbol
Name/Description
Reserved Register for Internal Use.
7—0
—
Lucent Technologies Inc.
49
AGERE [ AGERE SYSTEMS ]
