3060/V24
102001UA
2-5
S
ETUP
& I
NSTALLATION
P
ATTON
E
LECTRONICS
C
O
.
I
NSTALLATION
A
ND
O
PERATIONS
M
ANUAL
Fallback Clock Enable (SW-23-5)
If Clock Fallback is required when the primary clock fails, set switch SW23-5 to
OFF
OFF
OFF
OFF
OFF
. If
Fallback is not required set SW23-5 to
ON
ON
ON
ON
ON
. The Fallback clock rate is selected with the
internal baud rate option. When the Fallback is activated the FBC LED will illuminate.
Fallback Clocking From Sub-Channel 6 (SW22-4,5,6)
To use the Sub-Channel 6 RX Clock as the Fallback clock set SW22-4, 5 and 6 to
OFF
OFF
OFF
OFF
OFF
. Any
other position will select some internal clock rate as called out in the Internal Clock Rate
selection section.
Fallback Mode Selection (SW23-6)
If Fallback is required, two modes are available via switch SW23-6. To Fallback when the
transitions from the primary clock source stop, set SW23-6 to
ON
ON
ON
ON
ON
. To Fallback when DCD on
Sub-Channel 1 becomes inactive, set SW23-6 to
OFF
OFF
OFF
OFF
OFF
.
NOTE: Both T X and RX Clock Source Select MUST Be Set !!!!
TX Clock Source Selection (SW21-4,5,6)
TX Clock Source is selected by switch SW21-4, 5 and 6. The following table indicates the
source options provided by the 3060/V24 (CTS MD-V.24/TCB). When using the unit in Async
Mode, the INTERNAL clock source must be selected.
SW21-4
SW21-5
SW21-6
Source
ON
ON
ON
Master
OFF
ON
ON
Port 1
ON
OFF
ON
Port 2
OFF
OFF
ON
Port 3
ON
ON
OFF
Port 4
OFF
ON
OFF
Port 5
ON
OFF
OFF
Port 6
OFF
OFF
OFF
Internal
TX Clock Pin Selection (SW21-7)
The primary transmit clock can be derived from either pin 15 or 24. If pin 15 is to be the
source for primary TX Clock, set SW21-7 to
ON
ON
ON
ON
ON
. If pin 24 is to be the source for primary TX &
RX Clock, set SW21-7 to
OFF
OFF
OFF
OFF
OFF
.
