Chapter 2 Installation
2-1
2. INSTALLATION
2.1 Site
Selection
The following are guidelines for site selection. These guidelines must be followed to ensure proper
installation.
If it is to be rack mounted, location of the Rack Cage should be part of the central office equipment layout
design. Considerations should be given to entrance cable routing and -48 Vdc power cable routing if needed.
The installation site should have the appropriate power feed, 110 or 220 Vac or -48 Vdc power. If dual feed
is desired, dual independent -48 Vdc feed would be needed.
Similar considerations should be given for mounting on desktop. The unit is stackable, using available
protective rubber feet for each unit.
The following are the maximum suggested cable lengths:
1. V.35
70 m
200 feet
2. RS449
70 m
200 feet
3. RS232
15 m
50 feet
4. EIA530
70 m
200 feet
5. X.21
70 m
200 feet
6. MDSL
(see the following table)
The installation site should provide space for adequate ventilation and cable routing. Reserve at least 5
inches at the rear of the unit for cables and air flow.
The site should provide a stable environment. The operating area should be clean and free from extremes of
temperature, humidity, shock, and vibration.
Relatively humidity should stay between 0 and 95%. Do not operate the unit at an altitude greater than
4000m (13,000 feet).
The length of any lines, such as T1 or E1, must not exceed 1520m (5000 feet).