4.4 Securing the Connections
After all power and line connections are made, the wires should be neatly bundled and secured in place to prevent accidental breakage when in service. Use one or more of the cable guides supplied with the card rack, or tie in place with appropriate wire ties.
4.5 Interface connector Numbering
The Tellabs (or equivalent) card cage interface connector pins may have a different numbering scheme than the 1505. Table 4 depicts the card edge pin numbers as shown in the schematic, which is also the same as one type of connec- tor, followed by two alternate numbering schemes as used on other connectors. Dili- gently review the actual connections being used, to Table 4, to ensure proper connections are made for optimum performance. Record the external connections made during installation in the blanks rows in Table 4’s “User Connec- tion” column (make copies of Table 4 and keep records for each 1505).
5.Operation
5.1 Description
This 1505 module has up to four, receive bal- anced 600 Ω line inputs or high impedance un- balanced inputs, along with a Mic/Handset in-
put, that is user configurable by dip switch set- ting, to drive from one to four 600 Ω balanced transmit line outputs, or an 8 Ω remote speaker. The module is also capable of summing up to four receive channel inputs and/or a Mic/Hand- set input, into one or more transmit line outputs or the speaker output.
A compressor/limiter circuit is available by jumper selection for each receive circuit, to limit the input level to a predetermined setting, which assists in maintaining proper system lev- els. This module also contains a summed input circuit, and a summed output circuit, to allow it to be used in a matrix, i.e. three modules can be configured to allow a single input to drive twelve outputs, or conversely twelve inputs can be summed to one output.
Active switch input circuits allow for muting individual receive input channels, or the speaker. A PTT input activates the microphone circuit.
5.2 Operating Capabilities
The 1505 accepts up to four balanced or unbal- anced inputs, switch selectable by the user, to four balanced line driver outputs. These inputs are also externally mutable by switched low in- puts at the rear panel connection. In addition, the module will accept a microphone or hand- set input through the front panel jack or the rear panel connector.
The transmit amplifier is a
The module has a speaker amplifier output that may drive an eight ohm external speaker with an output level of 1 watt. The level is adjust- able.
Any line or microphone input may be switched (through a module dip switch) to any line out- put or the speaker output. Three 1505s can be connected so one line input may drive up to twelve
5.3 Controls and Indicators
Front panel LEDs light when the corresponding receive channel or speaker is muted and when the microphone or handset PTT switch is acti- vated.
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