ATL AM2048A OM, Руководство пользователя

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ATL TELECOM USER GUIDE
AM2048A OS/OM
25
4.9.3 Framing
4.9.3.1 Unstructured Operation
FIGURE 4.9.1: UNSTRUCTURED OPERATION
For unstructured working, Loss of Frame Alignment and AIS alarms are suppressed. The user
data passes transparently through the system. An arbitrary frame position is assumed for
mapping the user data in to the line pairs. The user data may or may not have TS0, and may
or may not be using CRC4.
To set up this configuration, go to the “Configuration > User Port” Menu and select
Rx Unframed
(*)
Rx Framed ( )
Rx CRC4 [ ]
Tx TSO Transparent (*)
Tx TSO Generate ( )
Tx CRC4 [ ]
CRC4G
Tx
TS0
TS0
Rx
CRC4M
FAW
A
SA4
SA5
SA6
SA7
SA8
HDSL
CRC6
CRC4
CRC4M
Rx
FAW
A
SA4
SA5
SA6
SA7
SA8
TS0 TS0
Tx
CRC4G
FAW
A
SA4
SA5
SA6
SA7
SA8
HDSL
CRC6
NTU ELU TE ET
T V3
FAW
A
SA4
SA5
SA6
SA7
SA8
4
24 ATL TELECOM USER GUIDE
AM2048A OS/OM
4.8.4 Crossing a PDH Network
In this example, a PDH network is shown where timing is passed transparently from end to
end in both directions. From a timing point of view, this is equivalent to connecting Master A
directly to Master B. To provide a Master clock to the system, side A should be set as in
section 4.9.1.3, otherwise, without a master clock somewhere in the path, the timing will be
unstable.
4.9 G.703 OPTIONS
4.9.1 Impedance
120ž Ohm and 75 Ohmž may be selected under software control and set differently at each
end of the link. E.g. CO (Master) set to 120ž Ohm and the CPE set to 75 Ohmž. The factory
default is for the AM2048 to auto-detect which interface is being used. Once a signal has
been detected on an interface, the impedance parameter is then set so that after a power
OFF-ON event the impedance is selected immediately. The AM2048 may be set back to auto-
detect at any time.
Connect the VT100 terminal emulator to the Master AM2048.
Go to the “Configuration>User Port” Screen to view/change the settings for the Master.
Use F8 to view/change the settings for the slave.
4.9.2 Timing
For a full treatment of the timing options, see section 4.8.
G.703/X.21/V.35/10BaseT/USB
Customer
Terminal
AM2048A AM2048A
G.703
Timing
Master
B
Slave
Customer
Terminal
AM2048A AM2048A
G.703
Timing
Master
A
Slave
PDH
Network
G.703/X.21/V.35/10BaseT/USB