TP3420A National Semiconductor, TP3420A Datasheet - Page 20

• Manufacturer Part Number: TP3420A
• Description: ISDN S/T Interface Device
• Manufacturer: National Semiconductor

www.national.com
Note 15: The code “0001” will be received by an NT1 when ST Request and any other code (except LP) is sent simultaneously by two or more TEs on a Passive
Bus.
Note 16: The code “0011” will be received by an NT1 when the LB1 and LB2 requests are transmitted by two different TEs (NT2s) on a Passive Bus.
Functional Description
Idle (NORMAL)
LP Loss-of-Power
STP Self Test Pass
STF Self Test Fail
ST Self Test Request
STI Self Test Indication
FECV Far End Code
Violation
DOI Disruptive Operation
Indication
DTSE-IN
DTSE-OUT
DTSE-IN&OUT
Loopbacks
LB1 Request
LB1 Indication
LB2 Request
LB2 Indication
LB1/2 Request
LB1/2 Indication
Loss-of-Received-
Unassigned
All SC2 Messages
Indication
(Note 15)
SCI Messages
Indication
(Note 16)
Signal
TABLE 8. Codes for SC1, SC2 and Q Channel Messages with 3X Checking Enabled
S11 S12 S13 S14
S21 S22 S23 S24
All Other Codes
—
—
—
—
0
1
0
0
0
1
0
1
0
1
1
1
1
1
Received at TE
Received at TE
All Codes
—
—
—
—
0
1
0
0
1
1
0
0
1
1
1
0
0
0
(Continued)
—
—
—
—
0
1
1
0
1
1
1
0
0
0
0
1
0
1
—
—
—
—
NT-to-TE
0
1
0
1
1
0
1
0
0
0
1
1
1
0
before MFR1 INT
before MFR2 INT
Repetitions
Number of
Repetitions
Number of
20
—
—
—
—
3
1
3
3
3
1
3
1
1
1
3
3
3
3
1
3
Q1 Q2 Q3 Q4
—
—
—
—
—
—
—
—
—
—
All Other Codes
1
0
0
0
1
0
Received at NT
—
—
—
—
—
—
—
—
—
—
1
0
0
1
0
0
—
—
—
—
—
—
—
—
—
—
—
—
1
0
0
1
1
1
—
—
—
—
—
—
—
—
—
—
1
0
1
1
1
1
TE-to-NT
before MFR1 INT
Repetitions
Number of
—
—
—
—
—
—
—
—
—
—
—
—
3
1
3
3
3
3
1