PairGain 150-1143-04, Руководство пользователя

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Functional Description 150-451-104-02, Revision 02
4 September 18, 1998 HDU-451 List 4
(HRE-454). These tables limit the number of doublers that can be housed
reliably in either the HRE-423 or HRE-454 enclosures. In the tables:
• the maximum ambient temperature column refers to the outside air
temperature
• the occupied slots column designates which slots (1, 2, 3, or 4) can be
occupied for each condition
For example, if the occupied slots for the HRE-423 are 1 and 3, the doublers
are located in slots 1 and 3 with slot 2 empty. If the occupied slots for the
HRE-454 are 2 and 4, the doublers are located in slot 2 and 4 with slots 1 and
3 empty. If other then the specific slot arrangements are used, then the next
lower temperature deployment rule must be used.
For example, if slots 1 and 2 or 3 and 4 are used in the HRE-454, instead of
slots 2 and 4, then use the deployment rules that apply when slots 1, 2, and 4
are occupied. All of the applications in
Table 2 and Table 3 that exceed 115ºF
meet the requirements of Section 10.2.1.3 of TA-NWT-001210. This Section
requires that HDSL equipment deployed in outside enclosures shall operate
in a temperature, ambient outside the housing, of -40ºF with no solar load, to
+115ºF with maximum solar load and maximum power dissipation.
The doubler may also be enclosed in the PairGain single-slot HRE-450
outdoor enclosure. Its thermal limits are also shown in
Table 2 .
Figure 2. HDU-451 Block Diagram.
POWER
SUPPLY
5 TIP 1
15 RING 1
HDSL
IN
XCVR
HDSL
OUT
XCVR
HDSL
FRAMER
HDSL OUTPUT 1
55 TIP
49 RING
HDSL OUTPUT 2
MICROPROCESSOR
1 2 1 2
HDSL 1 HDSL 2
TIP 1 41
RING 1 47
HDSL INPUT 2 330 K
TIP 7
RING 13
HDSL INPUT 1 330 K
+5V
-5V
180K
180K
100 to 200V
-
+
1
2
FRAME GND