That is not the A800. You are ,most likely,talking to the ADSLrouter/modem.
When you talk to the A800, the telnet screen will look like this:
Welcome to Tenor Multipath Switch Telnet Server
Serial #: A002-xxxxxC | Name: xxxxxxxxxl01 | Type: A400 | UTC: Unknown
Connected from IpAddr/Port# 67.xxx.xxx.xx3/3807 to Port# 23
If you get a null modem cable, you could do the same from the console port.
From a COM port on your PC or laptop, using a null modem cable. setup it for 9600, no parity, one stop and one start bit.