S1-5 and S1-6: Clock Source
Switches S1-1 and S1-2 are set in combination to determine the
source of the transmit clock for the Model 1180/35.
S1-5
S1-6
Setting
Off
Off
Received Recover Clock
On
Off
Internal Clock
Off
On
External Clock
On
On
Internal Clock
S1-7: DTE Control of RDL
The setting for switch S1-7 determines whether the V.35 DTE can
activate the RDL test by raising pin L. If DTE Control of RDL is
enabled, control from the front panel is disabled if there is no DTE
connected.
NOTE: If DTE control is not avialable, set Switch S1-7 to off.
S1-7
Setting
On
DTE control of RDL enabled
Off
DTE control of RDL disabled
S1-8: DTE Control of LAL
The setting for switch S1-8 determines whether the V.35 DTE can
activate the LAL test by raising pin N. If DTE Control of LAL is enabled,
control from the front panel is disabled if there is no DTE connected.
NOTE: If DTE control is not available, set Switch S1-8 to off.
S1-8
Setting
On
DTE control of LAL enabled
Off
DTE control of LAL disabled
6
Switches S1-1 though S1-4: Data Rate (Distance)
Switches S1-1 through S1-4 are set in combination to determine
two configuration parameters: synchronous data rate and maximum
distance. Maximum distance is determined by the space between data
packets in the communication stream between two Model 1180/35s.
The "2X" setting doubles the space between data packets, when
compared with the normal "1X" setting, and therefore doubles the
maximum distance. A setting of "2X" facilitates communication
distances up to 3 miles, and is available at certain data rates up to 64
kbps. A setting of "1X" supports communication at the normal distance
of 1.5 miles.
S1-1
S1-2
S1-3
S1-4
Data Rate (Distance)
On
On
On
Off
2.4 (1X)
Off
On
On
On
9.6 (2X)
On
Off
On
Off
14.4 (1X)
On
Off
On
On
19.2 (2X)
Off
Off
On
Off
28.8 (1X)
Off
Off
On
On
38.4 (2X)
On
On
Off
On
48.0 (2X)
Off
On
Off
Off
56.0 (1X)
Off
Off
Off
On
64.0 (2X)
Off
On
On
Off
72.0 (1X)
Off
Off
Off
Off
128.0 (1X)
On
On
Off
Off
144.0 (1X)
Off
On
Off
On
192.0 (1X)
On
On
On
On
256.0 (1X)
5
S1 SUMMARY TABLE
Position
Function
Factory Default
S1-1
Data Rate (Distance)
Off
S1-2
Data Rate (Distance)
Off
S1-3
Data Rate (Distance)
Off
S1-4
Data Rate (Distance)
On
S1-5
Clock Source
On
S1-6
Clock Source
On
S1-7
DTE Control of RDL
Off
Disabled
S1-8
DTE Control of LAL
Off
Disabled
}
Internal
}
64 kbps (2x)
