参数资料
型号: PEF80902
厂商: INFINEON TECHNOLOGIES AG
英文描述: 4B3T Second Gen. Modular ISDN NT(Ordinary)
中文描述: 4B3T二将军模块化综合业务数字网新台币(普通)
文件页数: 51/83页
文件大小: 1168K
代理商: PEF80902
PEF 80902
Operational Description
Data Sheet
43
2001-11-12
U3
U3 indicates that the whole link to the TE is synchronous in both directions.
On detecting U3 the LT requests the NT by U4H to establish a fully
transparent connection.
The M-channel on U may be used to transfer code error indications and
1 kbit/s transparent data.
U4H requires the NT to go to the
Transparent
state. On detecting U4H the
NT stops sending signal U3 and informs the S-transceiver or a layer-2
device via the system interface.
U4H
The M-channel on U may be used to transfer loop commands and 1 kbit/s
transparent data.
U4 transports operational data on B and D channels. The M-channel on U
may be used to transfer loop commands and 1 kbit/s transparent data.
U5 transports operational data on B and D channels. The M-channel on U
may be used to transfer code error indications and 1 kbit/s transparent
data.
The T-SMINTO sends periodically single pulses once per millisecond on
the U-interface. The test mode can be used for pulse mask
measurements.
Loss of frame, generated by flywheel
U4
U5
SP
LOF
Table 18
Generation of the 4B3T Signal Elements
Upstream
(NT to LT)
Downstream
(LT to NT)
symbols
(ternary)
sync
word
(tern
ary)
M
sym
bol
(tern
ary)
n/a
binary
data
before
scram
bling
n/a
U1W
U2W
Resulting in a tone of:
Frequency: 7.5 kHz
Duration: 2.13 ms
when sending the
wakeup tone is finished,
signal AWT is set and
ternary "0" is sent
scrambled binary data
scrambled binary data
scrambled binary data
16 times +
+ + + + +
+ +
n/a
U1A
U1
U3
U2A
U2
0
yes
yes
0
yes
yes
0
0
1
Table 17
4B3T Signal Elements
(cont
d)
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