D-Link DI-1750 Reference Manual page 39

Model Name
With this configuration, A is only to PING with C each other and B is only to PING with D each other.
4. Example of PRI interface configuring
router _config# control e1 3/2 (enter the E1 configurative mode)
router _config _controller# pri-group timeslot 1-5,9,10
router _config _controller#int s3/2:15 (enter the D channel configurative mode).
Example of BRI interface configuring
router _config# interface b3/2 (enter the isdn bri interface configurative mode)
router _config _b3/2#dialer string 222
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