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This chapter provides information about the site requirements required installing a VNS system. Normally, the VNS is co-located with an IGX or IPX switch and installed in the same rack; the node's rack requirements are covered in the appropriate Cisco IGX 8400 Series Installation or Cisco IPX Installation publications.
This chapter contains the following sections:
An AC or DC power source must be easily accessible within 6 feet of the VNS. The VNS must be powered from a dedicated branch circuit. An easily accessible disconnect device should also be included in the facility wiring.
 | Caution Cisco recommends that a battery-backup or uninterruptable power source (UPS) be provided for the VNS in case of power failures. |
The AC Power input must meet the requirements listed in Table 2-1. The VNS automatically adjusts to input voltages within its range.
| Minimum | Nominal | Maximum | |
|---|---|---|---|
Input voltage | 90 VAC | 120/208 VAC | 264 VAC |
Line frequency | 47 Hz | 50/60 Hz | 63 Hz |
The DC power input must meet the requirements listed in Table 2-2.
| Minimum | Nominal | Maximum | |
|---|---|---|---|
Input voltage | -40 VDC | -48 VDC | -60 VDC |
DC | Ground a 48V DC power feed, if used, on the positive 48 volt and safety ground pins. Ensure that the VNS frame, and all other frames, are attached to an isolated ground connection. The nominal operating voltage of the DC-model VNS is -48V DC. The DC source should be capable of supplying 5 amperes. Only power supplies complying with SELV requirements in EN60950 may be connected to the -48 VDC input. |
AC | An insulated grounding conductor that is identical in size to the grounded and ungrounded branch circuit supply conductors is to be installed as part of the branch circuit that supplies the device. This conductor has green insulation with yellow stripes. |
A 20A AC circuit breaker is recommended for the 120/208 VAC power source which supplies AC power to the AC version of the VNS. In North America, this circuit breaker should conform to NEC (ANSI/NFPA 70) and CED (Part 1. C22.1) for protection against excess currents, short circuits, and earth faults.
The site must be capable of maintaining a maximum ambient temperature of 50º C while the system is operating (recommended range is 20º C to 30º C). Cooling airflow direction is from front to rear.
You can mount the VNS into standard 19" rack or a 23-inch racks. (Cisco IGX 8400 Series Installation or Cisco IPX Installation documents have information about Cisco-supplied cabinet.) The VNS is 5 1/4 inches high. The VNS has front mounting flanges and is shipped with attachable rear and mid-mounting brackets.
You can mount the VNS into a standard 19-inch rack (17.75 " +0.12 and -0.00 inches between the rails), such as Cisco-supplied cabinet, which contains two front and rear mounting rails.
To install a VNS in a 23-inch rack, you need to provide adapter brackets to adjust the width of the rack opening to 17.75 (+0.12 and -0.00) inches. Adapter brackets for installation of 19-inch equipment are commercially available.
The VNS chassis contains two sets of holes, with attached PEM nuts, for the installation of mid-mounting brackets. These sets of holes are set back, 5 and 10 inches, from the front of the unit.
If you are using a terminal to configure your VNS, communication parameters should be set for VT100, 9600 baud, parity none, 8 bits, and 1 stop bit.
Installation of the VNS typically requires an additional 10BaseT hub to connect the VNS's Ethernet port to the IGX or IPX switches' LAN port. The10BaseT hub must be purchased separately.
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