American Telecom AM64/128A - Manual (Page 35)

AM64/128A User Manual Configuration Menu
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5.7.4.1 Synchronisation Type (for software version V1.3 and above)
With these later versions of software, there are three possible options depending upon which interface
is fitted, whether Master or Slave mode is selected, and the rate selected.
Option 1 - C > Ext Byte Clk
This option is shown when the ‘External Byte timing ON’ is selected. The Master unit accepts Byte timing
from external timing input (S EXT) and uses this to synchronise the link with its remote Slave unit.
or Option 2 - C > Ext Bit Clk
This option is shown when the ‘External bit timing ON’ is selected. The Master unit accepts bit timing
from external timing input (SEXT) and uses this to synchronise the link with its remote Slave unit.
or Option 3 - C > Internal Clk
This option is shown when the ‘External bit timing OFF’ is selected. The Master unit is the source of
synchronous timing to its remote Slave unit and attached DTE’s at both ends of the link.
The following options are shown, when the configurations below are selected :
1. X.21 Interface, Master mode, at ALL rates except 64kbps + Byte timing (64k BT).
Option 2 - C > Ext Bit Clk
or Option 3 - C > Internal Clk
2. X.21 Interface, Master mode, at 64kbps + Byte timing (64k + BT).
Option 1 - C > Ext Byte Clk
or Option 2 - C > Ext Bit Clk
or Option 3 - C > Internal Clk
3. X.21 bis, V.35, V36 and RS530 Interface, Master mode, ALL rates.
Option 2 - C > Ext Bit Clk
or Option 3 - C > Internal Clk
Note : If the Slave mode is selected, the options will remain as per the pre-V1.3 software as described in
section 5.7.4.