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This chapter provides information about the site requirements required to install a DAS Server Shelf and Dial-Up Frame Relay system. Normally, the DAS Server Shelf is co-located with an IGX, IPX, or BPX switch and installed in the same rack; the node's rack requirements are covered in the appropriate Cisco IGX 8400 Series Installation or the Cisco IPX Installation publications.
This chapter contains the following sections:
An AC or DC power source must be easily accessible within six feet of the DAS Server Shelf. The DAS Server Shelf must be powered from a dedicated branch circuit. An easily accessible disconnect device should also be included in the facility wiring.
The AC Power input must meet the requirements listed in Table 2-1. The DAS Server Shelf 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 DAS Server Shelf frame, and all other frames, are attached to an isolated ground connection.
The nominal operating voltage of the DC-model DAS Server Shelf 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 DAS Server Shelf. 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 20× C to 30× C). Cooling airflow direction is from front to rear.
You can mount the DAS Server Shelf into standard 19-inch rack or a 23-inch racks. (The Cisco IGX 8400 Series Installation or the Cisco IPX Installation documentation has information about the Cisco-supplied cabinet.) The DAS Server Shelf is 5 1/4 inches high. The DAS Server Shelf has front mounting flanges and is shipped with attachable rear and mid-mounting brackets.
You can mount the DAS Server Shelf 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 DAS Server Shelf 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 DAS Server Shelf 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 DAS Server Shelf, communication parameters should be set for VT100, 9600 baud, parity none, 8 bits, and 1 stop bit.
Installation of the DAS Server Shelf typically requires an additional 10BaseT hub to connect the DAS Server Shelf's Ethernet port to the IGX or IPX switch's LAN port. The10BaseT hub must be purchased separately.
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