psf21911 ETC-unknow, psf21911 Datasheet - Page 54

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Semiconductor Group
2.5.3
This category comprises commands and messages relating to maintenance bits of the
U-interface and the self-test according to ANSI T1.601. The commands and messages
may be mapped to the S/Q channel of the S/T-interface via the microprocessor. This
provides a method to exchange U-interface related information between a terminal on
the S-bus and the NT. Thus, the terminal can be informed about transmission errors that
occurred on the U-interface (NEBE, FEBE, FNBE) or request the NT to perform a self-
test (ST).
MON-1 messages are two bytes long. The first nibble of the second byte contains S/Q-
indications, the second nibble contains maintenance bit related commands. The
operation of MON-1-messages is identical in auto- and transparent mode.
The following tables give an overview of indications available in the MON-1 category.
MON-1 Structure
S/Q:
M:
The following indications and maintenance bits are defined in MON-1-messages.
Table 9
S/Q
SSSS (Bin)
0 0 0 1
0 0 1 0
0 1 0 0
MON-1
0 0 0 1
S/Q-channel
Maintenance bits – 00 … FF
Maintenance (MON-1)
Mon-1 S/Q-Channel Commands and Indications
Direction
D
STP
FEBE
1. Byte
U
ST
– 00 … FF
0 0 0 0
Function
S/Q-Channel
Self-test request. This command is issued by the
terminal to inquire whether layer 1 is present. No test
is performed within the U-transceiver. Upon reception
the U-transceiver replies with MON-1 “STP”.
Self-test pass. Indicates to the terminal that the U-
transceiver has received the command “ST” correctly.
Far-end block error. Via the FEBE bit set to (0) on the
U-interface it is indicated to the NT that transmission
errors occurred in the direction NT –> LT or NT –> LT-
RP.
H
H
= coded S/Q-command indication
= set/reset maintenance bits
54
S/Q-Code
S S S S
2. Byte
M M M M
U-Transceiver
M-bits
PSB 21911
PSF 21911
11.97