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UAD 1
Bit
7
Allowable gap during dial tone detection (PSTN):
6
00: Off
01: 70 msec.
10: 160 msec.
11: 240 msec.
5
Method to detect dial tone and line current (PSTN):
4
000: BZT (DTC/LCC)
3
001: LCC 5 sec.
010: DTC only
011: Undefined
100: DTC (USA)
101: LCC 3 sec.
110: Undefined
111: No Check
2
Maximum waiting time for dial tone (PSTN):
1
000: 20 sec.
0
001: 10 sec.
010: 8 sec.
011: 15 sec.
100: 3.3 sec.
101: Undefined
110: Undefined
111: Undefined
<Remarks>
UAD 1 Bits 7 and 6:
Sets the allowable gap during dial tome detection when calling directly to a PSTN. In dial tone detec-
tion, even if there are gaps within the time specified in this setting, the counter is not reset and contin-
ues to count the duration of dial tone detection after the dial tone whose frequency is in the specified
range is re-detected.
UAD 1 Bits 5 to 3:
Sets the method to detect the dial tone and line current when calling directly to a PSTN.
•
BZT (DTC/LCC)
Performs German BZT type of detection
•
LCC 5 sec.
Only 5 sec. Line current is detection
•
DTC only
Only dial tone is detected.
•
DTC (USA)
Only dial tone is detected. Duration of detected tone until it is regarded as the
dial tone is fixed 3.3 msec. Even if no dial tone is detected, dialing will be started.
•
LCC 3 sec.
3 second line current detection is performed.
•
No check
Neither dial tone nor line current is detected.
UAD 1 Bits 2 to 0:
Sets the maximum waiting time for dial tone detection when calling directly to a PSTN. If the dial tone is
not detected and redial attempt or internal retry will be performed later.
GD-1220/1221
SELF-DIAGNOSIS MODE
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