The customer requires to implement the 3 x 64 kbit/s =192 kbit/s leased line service through the following networking:
Router-----TDM SHDSL modem-----SDL GSHDSL port-----SDL E1 port-----DDF------CX300A-----uplink
On the UA5000, configure an intra-board semi-permanent connection from the SDL SHDSL port to the SDL E1 port (the start timeslot of the GSHDSL port is 0/15/4/0 and the end timeslot is 0/15/4/2; the start timeslot of the E1 port is 0/15/0/1 and the end timeslot is 0/15/0/3), with a bandwidth of 3 x 64 kbit/s = 192 kbit/s. After the configurations, it is found that the physical layer between the two routers is UP but the protocol layer is DOWN and that neither of the two routers can be pinged from the other.
The possible causes are as follows:
1. The physical connection is faulty.
2. The upper-layer link is faulty.
3. The data configurations are incorrect.
4. The Modem configurations are incorrect.