Configuration DIP Switch Set “S2”
The configuration switches on S2 allow you to specify the Clocking
Mode and to enable/disable Local and Remote Loop requests from the
V.35 DTE. Default settings of S2 are shown in the table below.
Switch S2-1, S2-2, S2-3, S2-4, and S-5:
Reserved for factory use and must remain in the OFF Position.
Switches S2-6 and S2-7: Clock Mode
Use Switches S2-6 and S2-7 to configure the 1088 for internal,
external, or receive recover clock mode.
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
Enable Loop from DTE
Off Disabled
Off
Off
Receive
Recover
Off
Off
Off
S2 SUMMARY TABLE
Factory Default
CO/CP
Unit
S2-6
S2-7
Clock Mode
Description
CO
On
On
Internal Transmit
clock
generated inter-
nally
CO
Off
On
External (DTE)
Transmit clock
derived from
terminal inter-
face
CP
On
Off
Receive Recover
Transmit clock
derived from the
received line
Off
Off
Reserved
5
Compact mDSL Modem
6
Compact mDSL Modem
Switch S2-8: Enable/Disable Loop Tests from DTE
Switch S2-8 may be used to allow the MDU9705A-V35 to enter loop-
back diagnostic tests (Local or Remote) when the V.35 DTE raises the
appropriate loop request pin (LLB: Pin L or RDL: Pin N). When Switch
S2-8 is in the On position, the MDU9705A-V35 will enter Local
Loopback or Remote Loopback at the request of the DTE. When
Switch S2-8 is in the Off position, the MDU9705A-V35 ignores DTE
loop requests. In the Off position, loop requests may still be initiated
by the front panel switch.
S2-8
Setting
On
DTE Loopback Request Enabled
Off
DTE Loopback Request Disabled
