Singnet 8mbps and D-Link DSL-2640T

[AST]

Keep getting d/ced, can be as frequent as shown in the logs:

Dec 22 11:40:58> PPPD Terminated Through Signal
Dec 22 11:40:58> Connection terminated.
Dec 22 11:40:58> pppd 2.4.3 started by root, uid 0
Dec 22 11:40:58> pingStat 2, oamHdr 230 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 200 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 280 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 240 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 260 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 600 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 230 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 800230 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 2B0 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 330 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 3B0 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 8002B0 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 800330 result 0
Dec 22 11:40:58> pingStat 2, oamHdr 8003B0 result 0
Dec 22 11:40:58> get 0xF at Addr 0xA30085B0
Dec 22 11:40:58> ppp0
Dec 22 11:40:59> Connect: ppp0 {--} nas0
Dec 22 11:41:00> PAP authentication succeeded
Dec 22 11:41:00> peer from calling number 00:90:1A:42:87:AA authorized
Dec 22 11:41:00> PPPoE Connect with IP Address 116.15.141.94
Dec 22 11:41:00> PPPoE Connection Successfully Established
Dec 22 11:41:01> PPPoE Connect with Gateway IP Address: 116.14.184.1
Dec 22 11:41:01> WAN IP address 116.15.141.94
Dec 22 11:41:02> WAN gateway 116.14.184.1
Dec 22 11:41:02> primary DNS address 165.21.100.88
Dec 22 11:41:02> secondary DNS address 165.21.83.88
Dec 22 11:41:02> ppp0
Dec 22 11:53:53> DSL out of sync
Dec 22 11:54:17> DSL Carrier is down
Dec 22 11:54:32> DSL in Sync
Dec 22 11:54:37> DSL Carrier is up
Dec 22 11:54:38> sar read trained mode (16)(ADSL_2plus_AnxM)
Dec 22 11:54:39> PPPD Terminated Through Signal
Dec 22 11:54:39> Connection terminated.
Dec 22 11:54:39> pppd 2.4.3 started by root, uid 0
Dec 22 11:54:39> pingStat 2, oamHdr 230 result 0
Dec 22 11:54:39> pingStat 2, oamHdr 200 result 0


Even after changing to PPPoA and fiddling around with the mode settings I get this:
Dec 22 11:55:55> DSL in Sync
Dec 22 11:55:55> DSL out of sync
Dec 22 11:55:55> DSL in Sync
Dec 22 11:55:57> DSL Carrier is up
Dec 22 11:55:58> sar read trained mode (16)(ADSL_2plus_AnxM)
Dec 22 11:55:58> pingStat 2, oamHdr 230 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 200 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 280 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 240 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 260 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 600 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 230 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 800230 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 2B0 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 330 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 3B0 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 8002B0 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 800330 result 0
Dec 22 11:55:58> pingStat 2, oamHdr 8003B0 result 0
Dec 22 11:55:58> get 0xF at Addr 0xA30085B0
Dec 22 11:55:58> pppd 2.4.3 started by root, uid 0
Dec 22 11:55:58> Connect: ppp0 {--} 0.100
Dec 22 11:56:03> PAP authentication succeeded
Dec 22 11:56:03> ppp0
Dec 22 11:56:03> WAN IP address 121.7.134.91
Dec 22 11:56:03> PPPoA Connect with IP Address 121.7.134.91
Dec 22 11:56:03> PPPoA Connection Successfully Established
Dec 22 11:56:03> PPPoA Connect with Gateway IP Address: 116.14.184.1
Dec 22 11:56:03> WAN gateway 116.14.184.1
Dec 22 11:56:05> primary DNS address 165.21.100.88
Dec 22 11:56:05> secondary DNS address 165.21.83.88
Dec 22 12:00:00> ppp0
Dec 22 12:00:03> Connection terminated.
Dec 22 12:00:03> System Call Error
Dec 22 12:00:03> connect(0.100): Device or resource busy
Dec 22 12:00:03> pppd 2.4.3 started by root, uid 0
Dec 22 12:00:03> PVC already opened. dmachan = 0
Dec 22 12:00:03> closing 0.0.100.5
Dec 22 12:00:03> tn7sar_teardown_complete called for channel 0
Dec 22 12:00:03> ChannelTeardown returned rc = 0
Dec 22 12:00:03> Connect: ppp0 {--} 0.100
Dec 22 12:00:06> PAP authentication succeeded
Dec 22 12:00:06> PPPoA Connect with IP Address 116.15.26.67
Dec 22 12:00:07> PPPoA Connection Successfully Established
Dec 22 12:00:07> PPPoA Connect with Gateway IP Address: 116.14.184.1
Dec 22 12:00:07> WAN IP address 116.15.26.67
Dec 22 12:00:08> WAN gateway 116.14.184.1
Dec 22 12:00:08> primary DNS address 165.21.100.88
Dec 22 12:00:08> secondary DNS address 165.21.83.88
Dec 22 12:00:08> ppp0

So what's causing the problem? Is it the router?