T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
7 Transmission Superblock (continued)
7.6 DFAC Register Set (continued)
Table 34. SSR: S-Interface Status Register (0x11)
Reg
R/W
Bit 7
FSERR
0
Bit 6
—
Bit 5
—
Bit 4
Bit 3
Bit 2
ASI2
0
Bit 1
ASI1
0
Bit 0
ASI0
0
SSR
R
RXINFO3 RXINFO1
RESET Default
—
—
0
0
Bit #
Symbol
Name/Description
FSERR
S/T-Block Receiver Frame Synchronization Error. This bit reflects the current state of
the FSERR bit from the S/T-block. FSERR indicates that a framing error has occurred on
the S/T-interface. Any type of frame error (including a transition from INFO2 or INFO4 to
INFO0) immediately sets FSERR = 1. FSERR is reset to zero upon completion of an
error-free frame. Note that bit SIR[FSERRL] is a latched version of this signal.
7
—
Reserved.
6—5
4
RXINFO3
Receiving INFO3. This bit tracks the reception of INFO3 on the S/T-interface.
0: INFO3 not detected.
1: INFO3 present.
3
RXINFO1
ASI[2:0]
Receiving INFO1. This bit tracks the reception of INFO1 on the S/T-interface.
0: INFO1 not detected.
1: INFO1 present.
S-Block G State. These 3 bits reflect the current state of the S/T-block activation state
machine.
2—0
000: S/T-interface disabled. Sending INFO0.
001: (I.430 G1 State) deactivated. NT and TE are deactivated; both are sending
INFO0.
010: (I.430 G2 State) pending activation. NT is transmitting INFO2 to initiate activation
(ACT bit = 1) and is receiving INFO0.
011: (I.430 G3 State) activated. NT and TE are fully activated; i.e., NT transmitting
INFO4 and receiving INFO3.
100: (I.430 G4 State) pending deactivation. S/T-interface is sending INFO0.
101: S/T-interface is receiving INFO1 and waiting for synchronization on the U-interface
before transmitting INFO2 (i.e., the S/T block has exited state G1 but not yet
entered state G2). This is not an I.430-defined state, but is required for NT1 imple-
mentation.
110: S/T-interface is receiving INFO3 and waiting for activation indication (U-interface
downstream ACT = 1) on the U-interface before transmitting INFO4 (i.e., the S/T
block has exited state G2 but not yet entered state G3). This is not an I.430 state,
but is required for NT1 implementation.
111: Not used.
42
Lucent Technologies Inc.
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