“Two-wire stations include the N-8000MS Multifunctional Master Station, equipped with a 32-character alphanumeric Alpha-numeric LCD display, handset and speed dial functions; the N-8010MS Standard Master Station with keypad and handset; the N-8020MS Industrial Master Station, built to withstand severe environmental conditions; and the N-8011MS Hands-Free Master Station offering hands-free simultaneous two-way (duplex) communication via an innovative ambient noise sensing function. Other two-wire stations include the N-8031MS Flush-Mount Hands-free Master Station, N-8050DS Indoor Sub-station and Q-N-8050WP Outdoor Sub-station. For custom station applications, TOA offers the N-8031SB Hands-free Master Station Board Unit and the N-8050SB Hands-free Substation Board Unit. Station line monitoring is also available via software, web browser or station display”
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“The N-8020MS is an industrial-use master station that connects to an N-8000EX or N-8010EX intercom exchange by a single twisted pair wire. It is capable of full duplex hands-free or handset communication with other full duplex stations. The N-8020MS is IP54 for outdoor applications. It includes an external speaker connection (.6 W @ 8Ω) and a remote controllable open collector control output. External or internal speaker priority is supported. The master station may be wall or desk mounted.”
2-wire stations 10
On this page- http://www.toaelectronics.com/products/intercom-systems/two-wire-stations/N-8020MS
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“Two-wire stations include the N-8000MS Multifunctional Master Station, equipped with a 32-character alphanumeric Alpha-numeric LCD display, handset and speed dial functions; the N-8010MS Standard Master Station with keypad and handset; the N-8020MS Industrial Master Station, built to withstand severe environmental conditions; and the N-8011MS Hands-Free Master Station offering hands-free simultaneous two-way (duplex) communication via an innovative ambient noise sensing function. Other two-wire stations include the N-8031MS Flush-Mount Hands-free Master Station, N-8050DS Indoor Sub-station and Q-N-8050WP Outdoor Sub-station. For custom station applications, TOA offers the N-8031SB Hands-free Master Station Board Unit and the N-8050SB Hands-free Substation Board Unit. Station line monitoring is also available via software, web browser or station display”
Replace with-
“The N-8020MS is an industrial-use master station that connects to an N-8000EX or N-8010EX intercom exchange by a single twisted pair wire. It is capable of full duplex hands-free or handset communication with other full duplex stations. The N-8020MS is IP54 for outdoor applications. It includes an external speaker connection (.6 W @ 8Ω) and a remote controllable open collector control output. External or internal speaker priority is supported. The master station may be wall or desk mounted.”