Multiplex Equipment" is a 45 Mb/s system (672
equivalent voice channels) which may or may not fit
a specific application. Other typical fiber optic
equipment bit rates are 6 Mb/s, 90 Mb/s, 135 Mb/s,
405 Mb/s, and 560 Mb/s.
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System shall interface directly with tie trunks on T1 carrier without the
use of channel banks. System shall be equipped with a synchronous clock
for interfacing with other digital switching equipment on a direct digital
basis. Clock shall be stable to no more drift than one bit in 10 to the
8th power per day.
2.6
CONNECTOR BLOCKS
Connector blocks shall be 66 type equipped with punch down clips.
2.7
TERMINAL BLOCKS
Provide wirewrap type for terminating line circuits, trunks, and inside
cabling.
2.8
POWER SYSTEM
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NOTE: For noncritical systems smaller than 200
lines, power supply should be an integral part of
the system power supply and should utilize an
isolated circuit. For critical or larger system,
power supply should be a separate dc system with a
charger. Consult with USER for power reliability
requirement, i.e. the need for a redundant charger.
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[EPABX voltage rating: 120 volt plus or minus 10 percent, 60 Hz. Power
system shall be contained within the switch cabinets.] Provide a negative
48 Vdc power supply with [_____] ampere chargers. Chargers shall be sized
to supply the full load requirements of EPABX, ancillary equipment plus
[_____] amperes. When two chargers are provided each charger shall have
the capacity to supply the full load requirement should one charger fail.
Transfer of power to one charger shall be automatic and without loss of
system functions. Provide distribution power panel. Panel shall be
equipped with a low voltage cutoff circuit to disconnect the negative 48Vdc
when the voltage falls below minus 44 volts.
2.9
STANDBY BATTERY SYSTEM
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NOTE: Type of batteries and characteristics are
described in IEEE STD 446. Commonly used type is
lead calcium because it does not require periodic
equalizing charge if floated between 2.20 and 2.25
volts per cell. Also, presently available is the
sealed maintenance-free type which does not require
special ventilation due to accumulation of hydrogen
gas. However, ventilation of battery room is
required by NFPA 70 for safe environment, i.e.
concentration of gaseous hydrogen should not exceed
2 percent accumulation per unit volume. Factors
SECTION 16720N
Page 16
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