Nortel Meridian 1 Option 11C Planning And Installation Manual page 57

Follow the guidelines below to assist you in positioning the system
equipment. If you plan on installing one or more expansion cabinets, read the
section called "Additional considerations for multiple-cabinet systems" on
page 58.
• The recommended method of system cabinet installation is
wall-mounting. If you cannot mount the cabinets on the wall (for
example, if there is not enough wall space), you can mount each cabinet
on an optional pedestal. However, you will still need wall space for
installing a cross-connect terminal and other optional equipment.
• Each Option 11C cabinet measures 25 in. (635 mm) high by 22 in.
(560 mm) wide by 12 in. (305 mm) deep, or 14 in. (356 mm) deep with
the newer Option 11C door.
• Leave adequate space for one or more expansion cabinets. When
possible, mount the expansion cabinets next to each other horizontally
(horizontal expansion) to ensure proper heat dissipation.
• If horizontal expansion is not possible, vertical expansion is permitted
for two cabinets. Make sure the expansion cabinet is mounted above the
main cabinet.
Vertical expansion of three or more cabinets is not recommended. Such
a configuration makes reaching the topmost cabinet difficult.
Note: Temperature limits are more stringent when expanding vertically.
Review the temperature limits stated in the Environmental requirements
section of this guide before deciding to expand vertically. Do not install
an expansion cabinet on top of an existing floor-mounted cabinet.
• When planning for a system that is equipped with DTI/PRI capability,
allow space on the backboard for the channel service unit (CSU).
• Leave at least 6 in. (155 mm) above the mounting bracket and any
obstruction (such as a pipe or conduit) so that there is room to lift the
cabinet on and off the bracket.
• Leave at least 12 in. (305 mm) between the top of a cabinet and the
ceiling to ensure proper ventilation.
• Leave 10 in. (255 mm) between the bottom of the lower cabinet and the
floor to prevent water damage and to allow for convectional cooling.
System and site requirements Page 57 of 408
Option 11C Planning and Installation Guide