Si2401
Preliminary Rev. 0.9
35
S28
0x28
VTSOH V.22bis 2400 bps scrambled ones length high. Minimum length
of time for transmission of 2400 bps scrambled binary ones by a
call mode V.22bis modem (256 x 5/3 ms units added to the time
specified by VTSOL).
0x08
S29
0x29
IS
Intrusion suspend. When S82[2:1] (IB) = 10
b
, this register sets
the length of time from when dialing begins that the off-hook
intrusion algorithm is blocked (suspended) (500 ms units).
0x00
S2A
0x2A
RSO
Receive scrambled ones V.22bis (2400 bps) length.
Minimum length of time required for detection of scrambled
binary ones during V.22bis handshaking by the answering
modem after S1 pattern conclusion (5/3 ms units).
0xD2
S2B
0x2B
DTL
V.23 direct turnaround carrier length. Minimum length of time that
a master mode V.23 modem must detect carrier when searching
for a direct turnaround sequence (5/3 ms units).
0x18
S2C
0x2C
DTTO
V.23 direct turnaround timeout. Length of time that the modem
searches for a direct turnaround carrier (5/3 ms units added to a
minimum time of 426.66 ms).
0x08
S2D
0x2D
SDL
V.23 slave carrier detect loss. Minimum length of time that a
slave mode V.23 modem must lose carrier before searching
for a reverse turnaround sequence (5/3 ms units).
0x0C
S2E
0x2E
RTCT
V.23 reverse turnaround carrier timeout. Amount of time a slave
mode V.23 modem searches for carriers during potential reverse
turnaround sequences (5/3 ms units).
0xF0
S2F
0x2F
FCD
FSK connection delay low. Amount of time delay added
between end of answer tone handshake and actual modem
connection for FSK modem connections (5/3 ms units).
0x3C
S30
0x30
FCDH
FSK connection delay high. Amount of time delay added
between end of answer tone handshake and actual modem con-
nection for FSK modem connections (256 x 5/3 ms units).
0x00
S31
0x31
RATL
Receive answer tone length. Minimum length of time required
for detection of a CCITT answer tone (5/3 ms units).
0x3C
S32
0x32
OCDT
The time after going off-hook when the loop current sense bits
are checked for overcurrent status (5/3 ms units).
0x0C
S34
0x34
TASL
Answer tone length when answering a call (5/3 ms units). This
register is only used if TATL (1E) has a value of zero.
0x5A
S35
0x35
RSOL
Receive scrambled ones V.22 length (5/3 ms units). Minimum
length of time that an originating V.22 (1200 bps) modem must
detect 1200 bps scrambled ones during a V.22 handshake.
0xA2
S36
0x36
ARM1
Second kissoff tone detector length. The security modes, A1 and
!1, echo a “k” if a kissoff tone longer than the value stored in
SKDTL is detected (10 ms units).
0x30
Table 21. S-Register Summary (Continued)
“S”
Register
Register
Address
(hex)
Name
Function
Reset
*Note:
These registers are explained in detail in the following section.
