PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 113

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Table 19
If a command is declared as data (d/m = (0)), the IEC-Q will acknowledge with "UTC"
(i.e. 01AA
acknowledged with the "Hold" message and the correct NT address (i.e. 0100
"Predefined EOC Codes", page 231, for a complete list. All detected EOC-commands on
U are latched, i.e. they are valid as long as they are not explicitly disabled with the EOC
"RTN" command or a deactivation.
Each new EOC-command will be indicated with one single MON-0-message after the
triple-last-look criterion has been met (also if other addresses than (000) or (111) or
d/m = (0) are used). The verified message is not compared to the last accepted message
(triple-last-look). Instead a MON-0-message will be issued every time the new verified
message is different from the last. E.g. in case bit errors corrupted an EOC-command
the correct command will be reissued after error free transmission is resumed. The
execution of a correctly addressed command (000
"triple-last-look" criterion is met.
MON-0-commands given via IOM
NT-Transparent Mode
Every 6 ms a MON-0-message is issued on IOM
EOC-message. No acknowledgment, no triple-last-look, no execution of the received
commands is performed in EOC Transparent mode. All these actions have to be initiated
by a control unit. With MON-8-messages all defined test functions (close/open loops,
send corrupted CRCs) can be executed in the NT, see "Test Loop-Backs", page 186.
Semiconductor Group
AA
XX
FF
53
54
H
). Commands addressed different from (000
Predefined EOC Messages
RCC
NCC
UTC
RTN
Request corrupt CRC
Notify of corrupt CRC
Unable to comply
Return to normal
Acknowledge
®
-2 (DIN) or microprocessor interface will be ignored.
113
B
or 111
®
-2. It contains the last received
B
) is performed only after the
Operational Description
B
) or (111
Data Sheet 01.99
PEB 2091
B
PEF 2091
) will be
H
), see