Comdial FX Series Especificações descarregar pdf (Página 151)

You exit the log viewing mode either by pressing the Speaker button, pressing the hookswitch, or

waiting for the 15-second time-out.

T1 Digital Carrier Transmission Option

(for Domestic U.S.A. Applications)

The T1 digital carrier transmission option is a domestic U.S.A. option that allows up to 24 channels

of voice and/or data transmissions over a single four-wire cable using multiplexing techniques in

superframe (SF) or extended superframe (ESF) format. For convenience, a customer service unit

(CSU) is built into the T1 option board to terminate the T1 channels, provide protection from

transient voltages, and respond to loopback requests from the central office.

Installers can place up to six T1 boards in the FX II. They can install these boards in any available

universal board slot. Of course, any station boards or any other installed line boards reduce the

number of lines available for T1 service and thus reduces the number of T1 boards that installers can

add to the system.

The installation must include the Synchronization card (DXOPT-SYN) on the auxiliary board

whenever one or more T1 boards is installed, and the FX II is receiving its timing signals from an

external source. In installations where the local FX II is supplying the clock signal for the far system,

the local system does not require a DXOPT-SYN card.

installers can assign a system status button to a station and enable the system to report T1

transmission errors via the T1 status log. Depending on how they program the system, the T1 status

log either prints out on an optional printer or is displayed on an optional video display terminal

(VDT). A user can also view the T1 status log from an LCD speakerphone by programming a system

status button.

Also, installers can arrange the system to alert the system attendant whenever a major alarm alerting

condition occurs by activating an external, customer-supplied audible or visual alarm. The external

alarm connects to one of the relay jacks (J3 or J4) on the front of the CPU board. Installers must

make sure the alarming device complies with system voltage and power requirements. installers

determine when a major alarm alerting condition should occur by programming threshold values and

corresponding time periods for each type of alarm caused by a transmission error. Whenever the

threshold value is reached within the programmed time period, the selected relay on the CPU board

is activated by the board’s circuits, which in turn, activates the external alarm. The system attendant

can turn the alarm off from any specified station by dialing a feature code.

Pad Level—Transmit, Receive

(Gain And Attenuation Settings for Line Transmit and Receive)

This feature enhances the T1–E1 digital carrier transmission option, the pad level programming

feature adjusts voice levels for both the transmit and receive circuits in the individual channels.

The choices include: Gain 2, Gain 1, Nominal, Loss 1, Loss 2, Loss 3, Loss 4, and Loss 5. These

settings provide an approximate +6 to -15 dB range of choices. Starting at the Nominal setting, each

gain level represents an approximate 3 dB amplification of the signal level from the previous setting,

Understanding the Features – 147

General Description GCA40–242

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Comdial FX Series Especificações Página 151