Comdial DXP Plus Series, Руководство пользователя

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Serial Data Port
The DXP Plus provides two serial data ports on the CPU board and dedicates them to PC-based
programming and the remote maintenance modem. The installer can add up to 16 additional serial data
ports to the system for interfacing such items as open architecture interface applications, PC attendant
positions, and the SMDA data printer. He or she adds these serial data ports by installing communications
cards on the services board, the expansion cabinet interface board, and the main cabinet’s auxiliary board.
Each of these boards accepts two communications cards in its lower two slots.
The DXP Plus supports a maximum of 18 serial data ports. Serial data ports 1 and 2 are the dedicated
ports provided by the cpu board while communications cards provide the remaining 16 undedicated ports
(serial data ports 3–18).
The maximum available serial data baud rate is dependent upon the location of the communications card.
For cards located on the services board, the maximum baud rate is 19200 baud. For cards located on the
auxiliary board or on the interface boards, the maximum baud rate is 9600 baud. There are some
limitations involved. If a device is transmitting / receiving from the DXP Plus at a high rate, engineering
sources recommend the use of a communications protocol (RTS / CTS or XON / XOFF) to prevent
buffer overrun and data loss.
The maximum cable distance between a serial data device and a serial data port varies with the port’s
system location. The dedicated ports on the services board are limited to 25 feet of cable. The undedicated
serial ports on the services board are limited to 500 feet of cable when operated at the 19200 baud rate.
The undedicated serial ports on the auxiliary and interface boards are limited to 50 feet when operated at
the 9600 baud rate.
For related information, refer to the feature description titled, Communications Card Support.
Service Observing
Service observing is programmable as a station class of service feature. It allows users to enter an
in-progress call in an unannounced muted mode, to monitor the conversation. No warning tones sound
when users make the call entry. This feature is useful in allowing a supervisor to monitor the
performance of an employee during a phone conversation with a client. In order for a station to use the
service observing feature, that station must have the initiate observe feature allowed and the telephone
being observed must be programmed as observable while service observing is activated. The station that
is being observed can continue to answer or originate multiple calls without disrupting the observing
station.
Shift Button
The programmer can button map a certain station to have a SHIFT button. If a telephone includes a
SHIFT button, the user can press it to reach a second level of speed dial storage.
Also see the paragraph titled Station Speed Dial.
Silent Mode Button
When a telephone is mapped with this button, the user can press it to turn off the ringer at his or her
station for the duration of the current ringing call. Ringer operation is restored when a new call rings at
the station.
Also refer to the discussion titled Programmable Button Flexibility.
GCA40–130 DXP Plus General Description
98 – Understanding The Features