T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
7 Transmission Superblock (continued)
7.6 DFAC Register Set (continued)
Table 26. USR0: U-Interface Status Register #0 (0x09)
Reg
R/W
Bit 7
AIB_n
1
Bit 6
Bit 5
Bit 4
UOA_n
1
Bit 3
DEA_n
1
Bit 2
OOF_n
0
Bit 1
XACT
0
Bit 0
ACTDN
0
USR0
R
FEBE_n NEBE_n
RESET Default
1
1
Bit #
Symbol
Name/Description
Alarm Indication Bit. Filtered (3x) version of downstream U-interface overhead bit AIB.
7
6
AIB_n
FEBE_n Far-End Block Error. Indicates whether a CRC error was detected in the most recent
U-interface received superframe at the far end.
0: CRC error in most recent far-end U superframe.
1: No CRC error detected at far end.
5
NEBE_n Near-End Block Error. Indicates whether a CRC error was detected in the most recent
U-interface received superframe.
0: CRC error in most recent received U superframe.
1: No CRC error detected in most recent received U superframe.
4
3
2
UOA_n U-Interface Only Activation. Filtered (3x) version of downstream U-interface overhead bit
UOA.
DEA_n
Deactivation Indication Bit. Filtered (2x) version of downstream U-interface overhead bit
DEA.
OOF_n Out of Frame. Indicates whether synchronization has been achieved on the U-interface.
0: U-interface out of frame.
1: U-interface is synchronized (SWs and ISWs are being properly detected).
1
0
XACT
U-Transceiver Active.
0: Transceiver is IDLE. No start-up requests are active. U block is in a low-power mode,
and line driver is in a high-impedance power-saving mode.
1: Transceiver starting up or active.
ACTDN Downstream Activation Bit. Filtered (3x) version of downstream U-interface overhead bit
ACT.
Table 27. USR1: U-Interface Status Register #1 (0x0A)
Reg
R/W
Bit 7
—
Bit 6
R64R
1
Bit 5
R54R
1
Bit 4
R44R
1
Bit 3
R34R
1
Bit 2
R25R
1
Bit 1
R16R
1
Bit 0
R15R
1
USR1
R
RESET Default
—
Bit #
7
Symbol
Name/Description
—
Reserved.
6—3
R[6:3]4R Receive U Bits. Filtered (3x) version of downstream U-interface overhead bits R64, R54,
R44, and R34.
2
R25R
Receive U Bit. Filtered (3x) version of downstream U-interface overhead bit R25.
1—0 R[16:15]R Receive U Bits. Filtered (3x) version of downstream U-interface overhead bits R16 and
R15.
Lucent Technologies Inc.
37
AGERE [ AGERE SYSTEMS ]
