The ornamental design for a communicationadapter, as shown and described.
FIG. 1 is a front perspective view of a communication adapter.
FIG. 2 is a rear perspective view of the communication adapter of FIG. 1.
FIG. 3 is a bottom, rear perspective view of the communication adapter of FIG. 1.
FIG. 4 is a top, front perspective view of the communication adapter of FIG. 1.
FIG. 5 is a left side view of the communication adapter of FIG. 1, the right side view being a mirror image of the left side view.
FIG. 6 is a front view of the communication adapter of FIG. 1; and,
FIG. 7 is a rear view of the communication adapter of FIG. 1.
The broken lines shown in the views are included for the purpose of illustrating portions of the communication adapter that form no part of the claimed design.