The 8400 Series telephones are versatile 2-wire/4-wire DCP telephones that offer flexibility and cost savings and support most of the key/hybrid features of DEFINITY ProLogix Solutions. (Table 1 shows the differences between the 8400 Series telephones and 6400 Series telephones.) These telephones detect automatically whether they are plugged into a 2-wire or 4-wire digital line circuit card. This significant benefit provides an easier transition to either a 2-line or a 4-line environment, thereby reducing wiring expenses and installation adjustments. These telephones also enable you to save space inside of the DEFINITY ProLogix Solutions cabinet by using 24-port 2-wire boards in place of 8-port 4-wire boards.
There are several models of 8400 Series telephones:
•8403 telephone
The 8403 is a 3-line telephone without a display that can be wall mounted. This telephone has a built-in, 1-way (listen-only) speakerphone and three programmable buttons. This telephone is not currently sold as new.
•8405B telephone
The 8405B is a 5-line telephone without a display that can be wall mounted. The 8405B has a built-in 1-way speaker and programmable keys. This telephone is not currently sold as new.
•8405B+ telephone
The 8405B+ is a 5-line telephone without a display that can be wall mounted. The 8405B+ has a built-in 2-way speaker and programmable keys. This telephone is not currently sold as new.
