2.3.3.8
Impulse Noise
Switching system shall meet an impulse noise limit of not more than five
counts exceeding 54 dBrncO voice weighed in a 5-minute period on six
measurements made during busy hour. Measurement shall be made by
establishing connection from impulse counter through the switch into a
quite 600-ohm termination.
2.3.3.9
Crosstalk Coupling
In the range of 200 to 3400 Hz the worst case equal level crosstalk level
shall not exceed 75 dB below the reference signal.
2.3.3.10
Absolute Delay
Absolute one-way delay through the switching system at 1800 Hz shall not
exceed 1000 microseconds.
2.3.3.11
Digital Error Rate
Digital switching system shall produce an error rate into digital
connections that shall not exceed 10 to minus 8 bits averaged over a
5-minute period.
2.4
HARDWARE REQUIREMENTS
2.4.1
Equipment Mounting Cabinets
Provide modular type cabinets to house the EPABX processor, memory cards,
lines, trunks, and miscellaneous items. Height of cabinets shall not exceed
2440 mm 8 feet including cable trays. Equip cabinets with front [and
rear] covers which are easily opened or removed.
2.4.2
Cabinet Mounting Shelves
Equip mounting shelves within cabinets with coded card slots to prevent
accidental insertion of plug-in cards into improper slots which could
result in damage to the system or the plug-in card. Identify each slot to
indicate which cards are usable in that particular slot.
2.4.3
Plug-In Cards
Provide identification on each card to indicate specific function.
Label
each card with model identification and issue number.
2.4.4
Overall Capacity
**************************************************************************
NOTE: Designer should insert the appropriate
quantities. Determine ultimate required size of
system and insert numbers into proper positions.
Voice line requirements will be in accordance with
Instrument Requirements, keeping separate the number
of lines and total number of sets. If ultimate size
is understated, system may have to be changed out
completely to meet future requirements. Trunk
description not used should be deleted.
SECTION 16720N
Page 13
Previous Page
