3040/V35
139001UA
2-7
I
NSTALLATION
A
ND
O
PERATIONS
M
ANUAL
S
ETUP
& I
NSTALLATION
P
ATTON
E
LECTRONICS
C
O
.
Tail Circuit Buffers (SW16-4)
The 3040/V35 (CTS MD-V.35/TCB) has a Tail Circuit Buffer that is automatically selected
when a Sub-Channel is set as a DTE. The buffer will provide clock synchronization of the data
from the Sub-Channel to the Master Port for Tail Circuit operations. The buffer is de-activated
when the Sub-Channel is configured as a DCE. When operating in an asynchronous
environment the Buffer must be bypassed. To bypass the buffer in a synchronous or
asynchronous application, set switch SW16-4 to
OFF
OFF
OFF
OFF
OFF
(ASYNC). For normal operation in a
synchronous environment set SW16-4 to
ON
ON
ON
ON
ON
(SYNC). When using a tail circuit modem with
the 3040/V35 (CTS MD-V.35/TCB), the modem connected to the Sub-Channel, should be set
to External Transmit Clocking. The modem at the remote end of the connection should be set
to RX-TX Clocking or Slaved TX Clock. This will insure the same clock is present throughout
the network and clock slippage will not occur.
Port DCE/DTE Selection (SW5 thru SW14)
Slide switches SW5 through SW14 are used to configure DTE/DCE for each port. Slide Both
switches associated with a port to the same position.
Example: If connecting a modem (DCE
Device) to the PORT, then the port should be configured as a DTE interface. Slide both
switches to the DTE position toward the interface connector. If connecting a terminal (DTE) to
the Sub-Channel, the port should be configured as a DCE. Slide both switched to the DCE
position away from the interface connector.
The port is always configured opposite to the
interface that is to be connected to it.
DCE
DCE
Forced DSR/DTR
J8 thru JP12