# CEPT E1 G.703 telephony interface

Interface | G.703 2048 kbit/s trunk interface
Framing | CEPT G.703/G.704 channel associated signaling
Signaling capabilities | ABCD bits for channel associated signaling and HDLC/LAPD for generating/terminating data link
Line code | HDB3 (in zero code suppression) or AMI
Alarm signal capabilities | Loss of frame alignment (LOF), loss of signaling multiframe alignment and loss of CRC multiframe alignment (red), remote alarm and remote multiframe alarm (yellow), alarm indication signal (AIS)
Counts | Bit error rate, CRC errors, slips, line code violations, far-end block errors
Loopback | Per channel and across channels under software control
Connectors | One Dialogic® MD1 Mini RJ-21 interface or two Dialogic® MD1 RJ-45 interfaces depending on the CG 6565E board variant.