參數(shù)資料
型號(hào)： T9000
英文描述： ISDN Network Termination Node (NTN) Device
中文描述： ISDN網(wǎng)絡(luò)終端節(jié)點(diǎn)（新界北）設(shè)備
文件頁數(shù)： 49/126頁
文件大?。?/td> 2127K
代理商： T9000
Lucent Technologies Inc.
49
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
T9000
8 Device Operation Control
(continued)
8.1 Device Operation Register
(continued)
Table 46. Reserved 1: Reserved Register for Internal Use (0x55)
Table 47. Reserved 2: Reserved Register for Internal Use (0x56)
Table 48. Reserved 3: Reserved Register for Internal Use (0x57)
Reg
R/W
R
Default
Bit 7
—
—
Bit 6
—
—
Bit 5
—
—
Bit 4
—
—
Bit 3
—
—
Bit 2
—
—
Bit 1
—
—
Bit 0
—
—
Reserved1
RESET
Bit #
7—0
Symbol
—
Name/Description
Reserved Register for Internal Use.
Reg
R/W
R/W
Default
Bit 7
—
—
Bit 6
—
—
Bit 5
Bit 4
U_R54T
1
Bit 3
Bit 2
—
—
Bit 1
—
—
Bit 0
—
—
Reserved2
RESET
U_FDEACT
0
MLSE_POWER_DN
0
Bit #
7—6
5
Symbol
—
U_FDEACT
Name/Description
Reserved for Internal Use.
U-Interface Force Deactivation.
When the NTN device is in LT mode
[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.
Transmit Reserved Bit.
When the NTN device is in LT mode [DOCR(NT_LT=1)],
this bit is sent as the R54 reserved bit.
4
U_R54T
When the NTN device is in NT mode, this bit has no effect.
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.
3
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.
Reserved for Internal Use.
2—0
—
Reg
R/W
R
Default
Bit 7
—
—
Bit 6
—
—
Bit 5
—
—
Bit 4
—
—
Bit 3
—
—
Bit 2
—
—
Bit 1
—
—
Bit 0
—
—
Reserved3
RESET
Bit #
7—0
Symbol
—
Name/Description
Reserved Register for Internal Use.
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