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PRACTICE 553-2201-183
P
Note 2: The Meridian SL-1 S
QPC501.
optional backplane is
equipped with only 8 slots.
4.18 When the QPC594, QPC729 or QPC789 Quad Density line card is
used with the QPC659 (note) Dual Loop buffer, there are no restrictions
to the number of packs in a Dual Loop shelf.
Note: In cabinets equipped with
QSD65.Dual
Loop shelves, one
QPC8O is required for every 14 PE shelves.
4
4.19 There are no Thermal Restrictions for the QPC594, QPC729 and
QPC789 Quad Density line cards even though no cooling unit is
available.
ENVIRONMENTAL
4.20 The
500/2500
Line packs have the following environmental
specifications:
(a) Operating Temperature Range: 0 to
50°
C, ambient.
(b)
Operating Humidity Range: 5 to 95
%.
(c)
Storage Temperature: -40 to i-70“ C.
Table 4-B
SUPERVISION LIMITATIONS
SUPERVISION LIMITATION
Answer Does not reverse the battery when
the terminating end answers.
Disconnect Does not momentarily open-circuit
the Tip and Ring leads or
disconnect.
_-
FOREIGN AND SURGE
VOLTAGE PROTECTION
4.21 When telephone lines connected to the line circuit are exposed to
foreign voltages by direct contact or induction (e.g., power line crosses
or lightning), protection devices must be installed on the customer’s
premises. These devices must be capable of providing a path to ground
from tip and ring for foreign voltages that exceed 600 V peak.
OVERLOAD LEVEL
4.22 Signal levels exceeding i-7
dBm
applied to the tip and ring cause
distortion in speech transmission.
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