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REFERENCE
Optional Enhancement Boards
The 7500 can accommodate one of three types of optional enhancement boards. Each enhancement
board provides a different industry standard data interface, which is designated Port 2 and is so labeled
on the back panel.
Multipurpose Enhancement Board
This board is used to provide an RS-366 Automatic Calling Unit (ACU) interface. It also converts
the EIA-232D interface on the main circuit board from asynchronous to synchronous depending on user
selection through the display interface.
This board comes with an adhesive RS-366 label with instructions to affix the label to the back
panel of the 7500 to help alleviate the problem of mistaking this for a second EIA-232D interface.
Second Asynchronous Interface Enhancement Board
This optional board is used to provide a second asynchronous EIA-232D interface. Dual concurrent
provisioned X.25 D channel data mode is supported. In addition, this configuration allows Mode 3/2
adaptive or Mode 2 circuit-switched B channel data operation on either port, but not both ports
simultaneously.
High Speed Synchronous Enhancement Board
This board is used to provide a V.35 interface at synchronous data rates of 48, 56, or 64 kbps via an
external adapter cord that is packaged with the board.
The board comes with an adhesive V.35 label with instructions to affix the label to the back panel
of the 7500 to help alleviate the problem of mistaking this for a second EIA-232D interface.
No connection should be made to Port 1 when the High Speed Synchronous option is installed.
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