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Switch S1 settings
Table 1 shows the settings for DIP switch S1-1 thru S1-8.
SW1-1 Line Coding: HDB3 (default)
Use Switch SW1-1 to control the Network Line Coding options. Set these
options to be the same as the Line Coding given to you by your Service
Provider. If you are using two Model 2707/Is together as short range
modems, set both units to HDB3.
Options:
HDB3, AMI
•
HDB3
. In this line coding, the transmitter substitutes a deliberate bipo-
lar violation when excessive zeros in the data stream are detected.
Table 1:
Switch S1 settings
Switch Description Setting
S1-1 Line Coding Off = HDB3
On = AMI
S1-2 Line Loopback (toward
E1 line)
Note
The Model 2707/I, when
in line loopback mode,
will loop the network line
and return any trafic
received on the E1 line
to the sending device at
the remote end.
Off = LLB disabled
On = LLB enabled
S1-3 Reserved Off = Default
S1-4 Reserved Off = Default
S1-5 Reserved Off = Default
S1-6/S1-7 Clocking Switch
1-6
On
On
Off
Off
Switch
1-7
On
Off
On
Off
Network
Internal (default)
Reserved
Network
S1-8 Reserved Off = Default
SW1-1 Line Encoding
Off HDB3
On AMI