Digi TransPort WR31 User Manual page 529

Configure legacy protocols
Only accept calls with sub-address ending with
This setting is only relevant when the interface is set to ISDN. This is the filter for the ISDN sub-
addressing facility. By default, this setting is blank. When set to an appropriate value, with
answering calls parameter above enabled, the router answers incoming ISDN calls only where
the trailing digits of the sub address called match the sub-address value. For example, setting
the Sub-address to 123 prevents the router from answering any calls where the sub-address
called does not end in 123.
Assume station exists (Do not send TEST frames)
When this parameter is enabled, TEST frames are not transmitted and the TEST response is not
expected. Instead, the router assumes the station exists and proceeds with the protocol as if the
DLSw has received the TEST response.
Toggle DCD output each time the DLSw protocol enters the DISCONNECTED state
When this parameter is set to On, the DCD (Data Carrier Detect) output turns off briefly each time
the DLSw protocol enters the DISCONNECTED state. Any attached equipment that needs to will
see signals changing state.
Sync port should not send or receive data when WAN link is down
Causes the Sync port to be deaf and dumb (and have DCD low) while the connection with the
WAN is down. This setting is supported to prevent terminals from assuming if L2 is up, the rest of
the WAN link should be working, at which point the router could go into a management error
state.
Digi TransPort WR Routers User Guide
Configure Systems Network Architecture over IP (SNAIP)
529