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Knowledge Base > WAN Cards (T1/E1 and V.35) > How do I configure CDRouter to use the Sangoma A101 or A102 T1/E1 cards?

How do I configure CDRouter to use the Sangoma A101 or A102 T1/E1 cards?

The newer A101 and A102 T1/E1 cards from Sangoma do not include the HDLC checksum when packets are returned to Linux. By default, CDRouter expects to find the HDLC checksum at the end of the data packet.

In order to use these cards (A101 and A102) with CDRouter, you must add the following testvar to your CDRouter configuration file: 

  testvar wanHdlcChecksum no

When testvar wanHdlcChecksum is set to 'no', CDRouter will no longer check for the HDLC checksum on incoming packets on the T1/E1 line. If testvar wanHdlcChecksum is set to 'yes', CDRouter will report that it can not parse the incoming PPP packets correctly.