2.19.4
Speakerphone
Stand-alone or integrated speakerphones shall provide for on-hook, hands
free, two-way conversation for users at least 3050 mm 10 feet away from the
instrument.
2.19.5
Instrument Requirements
The following instruments shall be provided:
Quantity
Description
[_____]
Single line - desk
[_____]
Single line - wall
[_____]
Electronic - desk
[_____]
Electronic - wall
[_____]
Attendant Console
[_____]
Wall speakerphone
[_____]
Desk speakerphone
2.20
FIBER OPTIC TRANSMISSION AND MULTIPLEX EQUIPMENT
**************************************************************************
NOTE: Delete paragraph and subparagraph if fiber
optic cable is not used in the project.
**************************************************************************
2.20.1
Optic Equipment
Optical span line terminal equipment shall be a T3 rate transmission system
with optical span line office terminals equipped to accept up to 28 T1
(1.544 Mb/s) signal lines multiplexing/demultiplexing them for
transmission/reception over a pair of optical fibers. Provide transfer
switching unit to dual, identical, redundant fibers in the event of damage
to the primary optical fibers. Provide a minimum of two optical
transmitting and two optical receiving units. Provide an alarm display for
indication of malfunctions or failures. Provide automatic transfer to the
redundant transceiver in the event of primary transmitter or receiver
malfunction. Provide dual, identical, redundant optical transmitters and
receivers at each end of each span.
2.20.1.1
Transmitter and Receiver
Provide transmitter and receiver in accordance with Section 16710
STRUCTURED TELECOMMUNICATION CABLES AND PATHWAYS.
2.20.2
Multiplex Equipment
Equipment shall provide an interface between DS-1 and DS-3 signals and
conform to the following:
Low Speed Interface (DS-1)
Channel Capacity
(28) DS-1 Signals
Line Rate
1.544 Mb/s plus or minus 0.5 b/s
Line Code
Half-width Bipolar
Line Impedance
110 ohms, plus or minus 5 percent
resistive nominal balanced
SECTION 16720N
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