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4.2 CONFIGURING THE HARDWARE DIP SWITCHES
The Model 1088 has two sets of eight DIP switches, which allow
configuration for a wide variety of applications. This section describes
switch locations and explains all settings.
The 16 external switches are grouped into two eight-switch sets,
and are externally accessible from the underside of the Model 1088, as
shown in Figure 4, below.
The two sets of DIP switches on the underside of the Model 1088
will be referred to in this manual as S2 and S3. As Figure 5 shows,
the orientation of all DIP switches is the same with respect to “ON” and
“OFF” positions.
4.2.1 Configuration DIP Switch Set “S2”
The only setting for S2 is for Clocking Mode between Model
1088s. All other switches are reserved for factory usage and must
remain in the default configuration. Default settings are shown in the
table below.
Switch S2-1, S2-2, S2-3, S2-4, S2-5 and S2-8:
Switches S2-1, S2-2, S2-3, S2-4, S2-5 and S2-8 are reserved for fac-
tory use and must remain in the factory default settings as shown in
the table above.
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 Model 1088 across the DSL
span) settings. One Model 1088 (typically the CO, or “Central Office”
unit) will be set for Internal Clock. The remote Model 1088 (typically
the CP, or Customer Premises unit) will be set for Receive Recover
clocking. The table below shows the clock mode settings.
10
CO/CP
Unit S2-6 S2-7 Clock Mode Description
Model 1088 gener-
CO On On Internal ates internal, crystal
controlled timing.
Model 1088
CP On Off Receive Recover receives its timing
from the CO unit
over the DSL span.
Position Function
S2-1 Reserved
S2-2 Reserved
S2-3 Reserved
S2-4 Reserved
S2-5 Reserved
S2-6 Clock Mode On
S2-7 Clock Mode Off
S2-8 Reserved Off
Off
Off
Receive
Recover
Off
Off
Off
S2 SUMMARY TABLE
Factory Default
OFF
ON
FRONT
REAR
Figure 4. Underside of Model 1088, showing location of DIP switches
S2
S3
ON
OFF
Figure 5. Close Up of Configuration Switches (all sets are identical in appearance)