15
Switches S2-6 and S2-7: Clock Mode
Use Switches S2-6 and S2-7 to configure internal or receive recover (clocking
derived from the remote mDSL Line Driver across the DSL span) settings. One
Line Driver (typically the CO, or “Central Office” unit) will be set for internal
clock. The remote Line Driver (typically the CP, or Customer Premises unit) will
be set for receive recover clocking. See Table 4-2.
Table 4-2. Clock mode.
CO/CP
S2-6
S2-7
Clock Mode
Description
Unit
CO
On
On
Internal
Line Driver generates internal,
crystal-controlled timing.
CP
On
Off
Receive Recover
Line Driver receives its timing
from the CO unit over the DSL
span.
4.2.2 C
ONFIGURATION
DIP-S
WITCH
S3
Use the DIP switches in Switch S3 to set the DTE Rate (for LAN bandwidth
allocation), the transmit data sampling point, and to reset the unit to its software
default settings. Table 4-3 summarizes default positions of DIP-switch S3. Detailed
descriptions of each switch follow the table.
Table 4-3. S3 summary.
Position
Function
Factory Default
S3-1
DTE Rate
On
S3-2
DTE Rate
Off
S3-3
DTE Rate
Off
S3-4
DTE Rate
Off
S3-5
DTE Rate
On
S3-6
DTE Rate
On
S3-7
Reset Software Defaults
On
Normal Operation
S3-8
Reserved
On
CHAPTER 4: Configuration
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