As Noor stated, out of the box the 1234 is a straight switch where all ports are created equal and no traffic separation is done.
In anything other than very basic networks, the engineer who designs the network will make changes to the switch configuration that require any replacement switch to be configured similarly. Some configuration tasks are complete show-stoppers such as multiple VLANs and trunk port setup. Others can cause more subtle problems like duplex mismatches resulting in poor performance, missing QoS resulting in choppy audio and video, and the like.
If the configuration of the previous switch was saved external to the switch and you have access to it, then this can be applied to the new switch and it should just work. Start with a clean slate. Erase the startup configuration and reboot the switch, then copy the previous configuration. You'll need to use the serial console for this.
If you do not have access to the previous configuration, you're in a bit of a bind and may need some hands-on expertise. The same company that configured the original switch and/or Sonicwall are your best bet. If you have access to the Sonicwall and there are sub-interfaces on the connection to the old switch, you have multiple VLANs for sure and are going to need some help.
When you get the new switch configured and working, be sure to save its configuration file as well as those of the Sonicwall and any other network gear in a safe place. The Adtran configurations are human-readable while Sonicwall is in a binary format.
