3
3..0
0 C
CO
ON
NF
FIIG
GU
UR
RA
AT
TIIO
ON
N
The Model 1089 is equipped with two sets of eight DIP switches,
which allow configuration of the unit for a wide variety of applications.
This section describes switch locations and explains all possible con-
figurations.
3.1 CONFIGURING THE HARDWARE DIP SWITCHES
The 16 external switches are grouped into two eight-switch sets,
and are externally accessible from the underside of the Model 1089
(See Figure 1).
The two sets of DIP switches on the underside of the Model 1089
will be referred to as S2 and S3. As Figure 2 shows, the orientation of
all DIP switches is the same with respect to “ON” and “OFF” positions.
5
Figure 2.
Close Up of Configuration Switches (all sets are identical in appearance)
Figure 1.
Underside of Model 1089, Showing Location of DIP Switches
Front
Back
On
S2
S3
Off
3.1.1 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 1089 for internal,
external, or receive recover clock mode.
6
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
S2 SUMMARY TABLE
Factory Default
Off
Off
Off
Off Disabled
Off
On
Receive
Recover
OFF
ON
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
