3-4
Cisco Network Convergence System 4000 Series Routers Site Planning Guide
Chapter 3 Site Planning Considerations
Cable Management
Front and Rear Clearances
The site requires the following front and rear clearances for chassis installation and maintenance access:
•
To install the chassis in the equipment rack: approximately 40 inches (101.6cm)
•
To service components and allow system airflow (both in front of and behind the chassis): 36 inches
(91.4 cm)
Note
Maintain at least 6 inches (15.2 cm) of clearance at both the inlet and exhaust openings on the
chassis and on the power modules to allow sufficient airflow.
Cable Management
As the size of the routing system increases, the cabling required for the chassis increases. For example,
a fully loaded Cisco NCS 4016 chassis has more cables connected to it than a partially loaded chassis.
The cabling runs must be carefully planned. The basic configurations for various routing systems should
be arranged to minimize the complexity and length of the cable runs. Precut and terminated cables are
considered part of the basic configuration.
•
CONSOLE or AUX RJ-45 RS-232 serial ports on the route processor cards for terminal connections
•
Ethernet ports on the route processor cards for connecting network management equipment
•
Modular service cards (MSCs) and physical layer interface modules (PLIMs) for data connections
The upper and lower cable management trays are for organizing these interface cables to keep the front
of the chassis clear and to eliminate sharp bends in the cables.
Caution
Excessive bending can damage interface cables.
Route Processor Cables
As you consider system cabling, see
to determine the types of cables required to connect to
ports on the route processor (RP).
Table 3-1
Route Processor Cables
RP Port
Required Cable Type
Ethernet management
STP
1
cable (Category 5 or better). Required for enhanced immunity
to external electromagnetic disturbance levels of 10 V/m and
10 Vrms.
1.
STP =
shielded twisted-pair
Alarm
Shielded cable. Required for EMC compliance.