參數(shù)資料
型號: PSB21911
廠商: SIEMENS A G
元件分類: 數(shù)字傳輸電路
英文描述: ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE
中文描述: DATACOM, ISDN ECHO CANCELLER
文件頁數(shù): 54/164頁
文件大?。?/td> 1401K
代理商: PSB21911
PSB 21911
PSF 21911
U-Transceiver
Semiconductor Group
54
11.97
2.5.3
Maintenance (MON-1)
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:
S/Q-channel
Maintenance bits – 00 … FF
H
= set/reset maintenance bits
The following indications and maintenance bits are defined in MON-1-messages.
Table 9
Mon-1 S/Q-Channel Commands and Indications
– 00 … FF
H
= coded S/Q-command indication
1. Byte
2. Byte
0 0 0 1
MON-1
0 0 0 0
S S S S
S/Q-Code
M M M M
M-bits
S/Q
SSSS (Bin)
0 0 0 1
Direction
D
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.
U
ST
0 0 1 0
STP
0 1 0 0
FEBE
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