T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
7 Transmission Superblock (continued)
7.6 DFAC Register Set (continued)
Table 24. UCR0: U-Interface Control Register #0 (0x07) (continued)
Name/Description
Bit #
Symbol
Initiate Start-Up. Setting this bit to 1 initiates a start-up sequence on the U-interface. After the activation
attempt, this bit is internally cleared to 0, automatically.
0
ISTP
0: No effect on device operation.
1: Attempt one U activation.
Table 25. UCR1: U-Interface Control Register #1 (0x08)
Reg
R/W
Bit 7
R64T
1
Bit 6
R25T
1
Bit 5
R16T
1
Bit 4
R15T
1
Bit 3
ULBKMUX
0
Bit 2
Bit 1
Bit 0
UCR1
R/W
ULLBK USPMAG USSP_E
RESET Default
0
0
0
Bit #
Symbol
R64T
Name/Description
7
6
Transmit Reserved Bit. Controls upstream U-interface overhead bit R64.
Transmit Reserved Bit. Controls upstream U-interface overhead bit R25.
R25T
5—4
3
R[16:15]T
ULBKMUX
Transmit Reserved Bits. Controls upstream U-interface overhead bits R16 and R15.
U-Interface Local Loopback MUX. Controls the point at which the U-interface local
loopback takes place when the ULLBK bit (see below) is asserted.
0: U local loopback occurs at the line interface (line must be disconnected during this
operation).
1: U local loopback occurs at the interface between the digital and analog section
of the U block. Line need not be disconnected during this operation.
2
ULLBK
U-Interface Local Loopback. Controls loopback of U-interface data stream at either the
line interface or the digital-to-analog boundary in the U block, depending on the ULBK-
MUX bit (see above). ULLBK turns off the echo canceller and reconfigures the receive
scrambler to match the transmit scrambler. If ULBKMUX = 0, the line should be discon-
nected prior to asserting ULLBK. This ensures that a sufficiently large echo is generated
so that the device can detect the echo as received data and synchronize to it.
0: No effect on device operation.
1: U-interface local loopback.
1
0
USPMAG
USSP_E
U Single Pulse Magnitude. Controls the magnitude of the pulse transmitted on the
U-interface when the device is in the U send single pulse test mode (see USSP_E bit
below).
0: Transmit ±3 pulses.
1: Transmit ±1 pulses.
U Send Single Pulse Enable. Test mode that causes the U-interface to continuously
transmit single 2B1Q pulses on the U-interface. The pulses occur at a rate of 1 pulse per
125 µs and alternate between positive and negative polarity. The magnitude of the
pulses is controlled by USPMAG (see above).
0: No effect on device operation.
1: Send single pulses on the U-interface.
36
Lucent Technologies Inc.
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