14
V.35 SYNC MODEM ELIMINATOR
JP3: Clock Source
The settings of the JP3 jumpers determine whether (a) both devices
connected to the V.35 SME use the SME’s internal clock or (b) the device on
Port A uses external clock and the device on Port B uses recovered (received)
clock. (Port A cannot be set for recovered clock; Port B cannot be set for
external clock. Do
not
set one port for internal clock and the other for
external or recovered clock; the system will not work.)
JP3 (Port A)
Setting
On positions 1 and 2
Internal clock
(factory default)
On positions 2 and 3
External clock
Removed
(This setting is reserved for future use)
JP3 (Port B)
Setting
On positions 1 and 2
Internal clock
(factory default)
On positions 2 and 3
Recovered (received loopback) clock
Removed
(This setting is reserved for future use)
JP1: RTS/CTS Delay
The settings of the JP1 jumpers determine the amount of delay after the V.35
SME detects RTS before it sends CTS in response. In order to emulate dialup
or leased-line modems, you can set either of these jumpers for 0 ms, 7 ms, or
53 ms of delay. The jumpers for Ports A and B can be configured
independently (that is, you can set them differently).
JP1
Setting
On positions 1 and 2
7-ms delay
(factory default)
On positions 2 and 3
53-ms delay
Removed
0-ms delay (no delay, instant response)
JP2: Carrier Control
The settings of the JP2 jumpers determine whether the V.35 SME holds
carrier constantly ON or turns it ON and OFF in response to RTS. The
jumpers for Ports A and B can be configured independently (that is, you can
set them differently).
JP2
Setting
On positions 1 and 2
Carrier controlled by RTS
On positions 2 and 3
Carrier constantly ON
(factory default)
Removed
(This setting is reserved for future use)
