PURPOSE: To instruct the toll line test from the maintenance personnel of exchange independently, by making the test information from a typewriter of the station itself the same form as that from the center.

CONSTITUTION: The interface of the test information from a remote toll line test center 10 is connected with an input/output device interface of an exchange 12, allowing to use the same form for the test information from a typewriter 21 of the station itself and that from the center. That is, a form 22 of typewriter of the station itself and a typewriter form 14 of the center can be made identical. Thus, the toll line test can independently be performed from the maintenance personnel of the exchange and the information line between external devices and measuring devices can be deleted.