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參數(shù)資料
| 型號(hào)： | T7256A |
| 英文描述： | Compliance with the New ETSI PSD Requirement |
| 中文描述： | 符合新的ETSI PSD的要求 |
| 文件頁(yè)數(shù)： | 26/116頁(yè) |
| 文件大?。?/td> | 1056K |
| 代理商： | T7256A |
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Data Sheet
January 1998
T7256 Single-Chip NT1 (SCNT1) Transceiver
22
Lucent Technologies Inc.
Microprocessor Interface Description
(continued)
Registers
(continued)
Table 5. Global Device Control—U-Interface (Address 01h)
Reg
GR1
R/W
R/W
Bit 7
SAI1
1
Bit 6
SAI0
1
Bit 5
XPCY
1
Bit 4
ACTT
0
Bit 3
NTM
1
Bit 2
PS1
1
Bit 1
PS2
1
Bit 0
LPBK
1
Default State on RESET
Register
GR1
Bit
0
Symbol
LPBK
Name/Description
U-Interface Analog Loopback.
Controls loopback of U-interface data
stream at the line interface. Loopback turns off the echo canceler and re-
configures the receive scrambler to match the transmit scrambler. The line
should be disconnected before this loopback test. This ensures that a suf-
ficiently large echo is generated so that the device can detect the echo as
received data and synchronize to it.
0—U-interface analog loopback.
1—No effect on device operation (default).
Power Status #2.
Controls PS2 bit in transmit U-interface data stream if
TDMEN = 0 (register GR2, bit 5). If TDMEN = 1, PS2 bit is ignored.
For ANSI T1.601 applications, PS1 and PS2 indicate the NT power status
via the following messages:
PS1
PS2
Power Status
0
0
Dying gasp.
0
1
Primary power out.
1
0
Secondary power out.
1
1
All power normal (default).
Power Status #1.
Controls PS1 bit in transmit U-interface data stream if
TDMEN = 0 (register GR2, bit 5). If TDMEN = 1, PS1 bit is ignored. See
PS2 bit definition.
NT Test Mode.
Controls ntm bit in transmit U-interface data stream and
indicates if the NT is in a customer-initiated test mode.
0—NT is currently in a customer-initiated test mode.
1—No effect on device operation (default).
Transmit Activation.
Controls act bit in transmit U-interface data
stream.
0—No effect on device operation (default).
1—Ready to transmit.
Transparency.
Controls data being transmitted at U-interface.
0—Enable data transparency.
1—No effect on device operation (default).
S/T-Interface Activity Indicator Control.
Controls sai bit in transmit
U-interface data stream. For ANSI T1.601 applications, the sai bit is set to
1 to indicate to the network that there is activity (INFO 1 or INFO 3) at the
S/T reference point. Otherwise, it is set to 0. The SAI[1:0] bits provide the
following options for controlling the sai bit:
00—Forces sai to 0 on the U-interface.
01—Forces sai to 1 on the U-interface.
1X—sai is set internally according to S-interface activity
(default = 11).
GR1
1
PS2
GR1
2
PS1
GR1
3
NTM
GR1
4
ACTT
GR1
5
XPCY
GR1
7—6
SAI[1:0]
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