Here is some output I noticed in var/log/messages:
Jan 11 15:05:47 dialer1 kernel: [ 1046.842828] Processing WAN device wanpipe1...
Jan 11 15:05:47 dialer1 kernel: [ 1046.842833] wanpipe1: Locating: A101/1D/A102/2D/4/4D/8 card, CPU A, PciBus=7, PciSlot=2
Jan 11 15:05:47 dialer1 kernel: [ 1046.842841] wanpipe1: Found: A101/1D/A102/2D/4/4D/8 card, CPU A, PciBus=7, PciSlot=2, Port=0
Jan 11 15:05:47 dialer1 kernel: [ 1046.842917] wanpipe1: AFT PCI memory at 0xD6100000
Jan 11 15:05:47 dialer1 kernel: [ 1046.842921] wanpipe1: IRQ 20 allocated to the AFT PCI card
Jan 11 15:05:47 dialer1 kernel: [ 1046.842952] wanpipe1: Starting AFT 2/4/8 Hardware Init.
Jan 11 15:05:47 dialer1 kernel: [ 1046.842974] wanpipe1: Enabling front end link monitor
Jan 11 15:05:47 dialer1 kernel: [ 1046.842979] wanpipe1: Global Chip Configuration: used=1 used_type=1
Jan 11 15:05:47 dialer1 kernel: [ 1046.846294] wanpipe1: Global E1 Front End configuration
Jan 11 15:05:47 dialer1 kernel: [ 1046.847324] wanpipe1: AFT Data Mux Bit Map: 0x01234567
Jan 11 15:05:47 dialer1 kernel: [ 1046.847337] wanpipe1: Configuring DS DS26521 E1 FE
Jan 11 15:05:47 dialer1 kernel: [ 1046.847340] wanpipe1: Port 1,HDB3,CRC4,120OH
Jan 11 15:05:47 dialer1 kernel: [ 1046.847342] wanpipe1: Clk Normal:0, Channels: FFFFFFFF
Jan 11 15:05:47 dialer1 kernel: [ 1046.847345] wanpipe1: Sig Mode CCS
Jan 11 15:05:47 dialer1 kernel: [ 1046.850562] wanpipe1: Rx Sensitivity Gain 43dB (default).
Jan 11 15:05:47 dialer1 kernel: [ 1046.850623] wanpipe1: Enable transmit AIS alarm
Jan 11 15:05:47 dialer1 kernel: [ 1046.851068] wanpipe1: Front end successful
Jan 11 15:05:47 dialer1 kernel: [ 1046.851293] wanpipe1: Front End Interface Ready 0x40000000
Jan 11 15:05:47 dialer1 kernel: [ 1046.851297] wanpipe1: Failed to register device in HW Echo Canceller module!
Jan 11 15:05:47 dialer1 kernel: [ 1046.851301] wanpipe1: E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.851425] wanpipe1: E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.851432] wanpipe1: Enable transmit AIS alarm
Jan 11 15:05:47 dialer1 kernel: [ 1046.851452] wanpipe1: AFT communications disabled! (Dev Cnt: 1 Cause: Device Down)
Jan 11 15:05:47 dialer1 kernel: [ 1046.851460] wanpipe1: E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.851468] wanpipe1: Enable transmit AIS alarm
Jan 11 15:05:47 dialer1 kernel: [ 1046.851488] wanpipe1: AFT communications disabled! (Dev Cnt: 1 Cause: Device Down)
Jan 11 15:05:47 dialer1 kernel: [ 1046.851518] wanpipe1: TASKQ Not Running
Jan 11 15:05:47 dialer1 kernel: [ 1046.851520] wanpipe1: Global Chip Shutdown Usage=1, Used_type_cnt=1
Jan 11 15:05:47 dialer1 kernel: [ 1046.851523] wanpipe1: Global E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.853561] wanpipe1: Master shutting down
Jan 11 15:05:47 dialer1 kernel: [ 1046.859394] wanpipe2: Starting WAN Setup
Jan 11 15:05:47 dialer1 kernel: [ 1046.859399]
Jan 11 15:05:47 dialer1 kernel: [ 1046.859401] Processing WAN device wanpipe2...
Jan 11 15:05:47 dialer1 kernel: [ 1046.859405] wanpipe2: Locating: A101/1D/A102/2D/4/4D/8 card, CPU A, PciBus=7, PciSlot=2
Jan 11 15:05:47 dialer1 kernel: [ 1046.859414] wanpipe2: Found: A101/1D/A102/2D/4/4D/8 card, CPU A, PciBus=7, PciSlot=2, Port=1
Jan 11 15:05:47 dialer1 kernel: [ 1046.859491] wanpipe2: AFT PCI memory at 0xD6100000
Jan 11 15:05:47 dialer1 kernel: [ 1046.859494] wanpipe2: IRQ 20 allocated to the AFT PCI card
Jan 11 15:05:47 dialer1 kernel: [ 1046.859520] wanpipe2: Starting AFT 2/4/8 Hardware Init.
Jan 11 15:05:47 dialer1 kernel: [ 1046.859543] wanpipe2: Enabling front end link monitor
Jan 11 15:05:47 dialer1 kernel: [ 1046.859547] wanpipe2: Global Chip Configuration: used=1 used_type=1
Jan 11 15:05:47 dialer1 kernel: [ 1046.862860] wanpipe2: Global E1 Front End configuration
Jan 11 15:05:47 dialer1 kernel: [ 1046.863890] wanpipe2: AFT Data Mux Bit Map: 0x01234567
Jan 11 15:05:47 dialer1 kernel: [ 1046.863902] wanpipe2: Configuring DS DS26521 E1 FE
Jan 11 15:05:47 dialer1 kernel: [ 1046.863905] wanpipe2: Port 2,HDB3,CRC4,120OH
Jan 11 15:05:47 dialer1 kernel: [ 1046.863908] wanpipe2: Clk Normal:0, Channels: FFFFFFFF
Jan 11 15:05:47 dialer1 kernel: [ 1046.863910] wanpipe2: Sig Mode CCS
Jan 11 15:05:47 dialer1 kernel: [ 1046.867157] wanpipe2: Rx Sensitivity Gain 43dB (default).
Jan 11 15:05:47 dialer1 kernel: [ 1046.867218] wanpipe2: Enable transmit AIS alarm
Jan 11 15:05:47 dialer1 kernel: [ 1046.867664] wanpipe2: Front end successful
Jan 11 15:05:47 dialer1 kernel: [ 1046.867889] wanpipe2: Front End Interface Ready 0x40010000
Jan 11 15:05:47 dialer1 kernel: [ 1046.867893] wanpipe2: Failed to register device in HW Echo Canceller module!
Jan 11 15:05:47 dialer1 kernel: [ 1046.867897] wanpipe2: E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.868022] wanpipe2: E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.868030] wanpipe2: Enable transmit AIS alarm
Jan 11 15:05:47 dialer1 kernel: [ 1046.868051] wanpipe2: AFT communications disabled! (Dev Cnt: 1 Cause: Device Down)
Jan 11 15:05:47 dialer1 kernel: [ 1046.868059] wanpipe2: E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.868067] wanpipe2: Enable transmit AIS alarm
Jan 11 15:05:47 dialer1 kernel: [ 1046.868087] wanpipe2: AFT communications disabled! (Dev Cnt: 1 Cause: Device Down)
Jan 11 15:05:47 dialer1 kernel: [ 1046.868117] wanpipe2: TASKQ Not Running
Jan 11 15:05:47 dialer1 kernel: [ 1046.868120] wanpipe2: Global Chip Shutdown Usage=1, Used_type_cnt=1
Jan 11 15:05:47 dialer1 kernel: [ 1046.868123] wanpipe2: Global E1 Front End unconfigation!
Jan 11 15:05:47 dialer1 kernel: [ 1046.870163] wanpipe2: Master shutting down