psf2115 ETC-unknow, psf2115 Datasheet - Page 136

• Manufacturer Part Number: psf2115
• Description: Isdn Adapter Circuit Ipac
• Manufacturer: ETC-unknow

Figure 65
2.7.4.2
The IPAC can operate with or without the “Monitor Timeout Procedure”. The TOD bit in
the SM/CI (Timeout Disable) controls the timeout function. TOD = ZERO enables the
function, TOD = ONE disables it.
With the timeout procedure enabled, the IPAC checks the monitor status once per multi-
frame. This check is performed at the same time the 20th (i.e. last) S-frame is transmitted
within the S-interface multi-frame structure.
In case the monitor is active the current status of the monitor channel is saved. This
condition will be compared with the status at the next check (i.e. 5 ms later). If the
condition of the monitor channel has not changed within this period the IPAC assumes
a lock-up situation.
The IPAC will resolve this lock-up situation by transmitting on DD a EOM (End of
Message) command (MX bit set to ONE for 2 IOM frames). After the transmission of
EOM the IPAC will retransmit the previous monitor channel data. No monitor channel
data will therefore be lost.
Semiconductor Group
Monitor Procedure Timeout (TOD)
Abortion of Monitor Channel Transmission
IOM -2
R
DU
DD
Frame
MX
MR
MX
MR
No.
1
1
1
1
0
0
0
0
1
2
136
Abort Request from Receiver
3
4
EOM
5
6
7
ITD09645
Functional Description
PSB 2115
PSF 2115
11.97