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This chapter tells you how to prepare your site for the installation of a LightStream 2020 multiservice ATM switch (LS2020 switch). It provides a convenient checklist that you can use to ensure an orderly, step-by-step installation process.
An LS2020 switch can be installed in any area that meets the specifications outlined in this chapter. A dedicated computer room with raised floors, controlled temperature and humidity, and clean air is desirable, but not required.
Use the checklist provided in Table 1-1 to prepare your LS2020 site and to ensure that you make adequate plans to obtain appropriate ancillary equipment.
If you are planning to install more than one LS2020 switch, you can photocopy the blank site preparation checklist in Table 1-1 and use it as a means for collecting appropriate information for each switch.
| Checkmark Column | Task Description |
|---|---|
| Select a rack that meets the characteristics and dimensional requirements described in the section "Rack Selection Guidelines " that appears later in this chapter. |
| Place the rack in an area that accommodates the cable routing and chassis clearance requirements described in the section "Site Selection and Space Considerations ." |
| Ensure that the floor is capable of supporting the weight of the LS2020 switch (see the section entitled "Floor Loading Considerations"). |
| Ensure that your LS2020 switch will be placed in an area that meets the environmental requirements described in Table 1-4 . |
| Ensure that your LS2020 switch will be placed in an area that accommodates the power consumption and component heat dissipation factors listed in Table 1-5 . |
| Ensure that your power supply meets the site power, AC power, or DC power requirements specified in the section entitled "Electrical Requirements." Ensure that each LS2020 switch has its own dedicated branch power circuit with a circuit breaker and grounded outlet. For LS2020 switches equipped with redundant power trays, it is highly recommended that you have two separate power circuits—one for each power tray. Although it is not technically necessary to have separate power circuits for each tray, a single circuit for both trays defeats the purpose of power redundancy. |
| If you plan to use DC power, schedule a licensed electrician to wire the LS2020 chassis to the DC power source. |
| To provide connectivity to each LS2020 switch in the event of network problems, obtain a modem for each switch card in your LS2020 network. Select a modem according to the information provided in the section entitled "Modem Recommendations ." |
| Read the section entitled "Miscellaneous Site Preparation Considerations" for information about safety factors, acoustic emissions, and applicable standards. |
| For network management purposes, obtain a Sun workstation that meets the hardware and software requirements outlined in the chapter entitled "Network Management System Requirements." |
| Order data cables appropriate to your LS2020 switch configuration, using the connector and cabling information provided in the chapter entitled "Connectors and Cables." |
| Order the appropriate country power kit or DC mounting kit, using the information provided in the section entitled "Country Kits and Power Cordsets" the "Connectors and Cables" chapter. |
| Using the appendix entitled "IP Addresses," provide the information listed below for each LS2020 switch that you plan to install. Each switch requires unique information. |
Chassis ID1: ________________________ Node Name: ________________________ Primary IP Address: ________________________ Primary NP Address Subnet Mask: ________________________ Secondary NP Address: ________________________ Secondary NP Address Subnet Mask: ________________________ NP Ethernet Address: ________________________ NP Ethernet Address Subnet Mask: ________________________ Default Router: ________________________ | |
This section provides guidelines for selecting an equipment rack to house your LS2020 switch.
The rack you select for your LS2020 switch should be a TIA- or EIA-compliant, 19-inch (48.3 cm) wide rack having the following characteristics:
Table 1-2 lists the physical dimensions of the LS2020 switch and its shipping crate.
| Dimension | Chassis | Shipping Crate | ||
Height | 26.07 in. | (66.2 cm) | 36 in. | (91.4 cm) |
Width | 18.91 in. | (48.0 cm) | 24 in. | (61.0 cm) |
Depth | 24.73 in. | (62.8 cm) | 31 in. | (78.7 cm) |
All chassis dimensions are within a manufacturing tolerance of plus or minus .02 in. (.05 cm). | ||||
An LS2020 chassis requires 26.25 inches (15 rack units, or 66.7 cm) of vertical rack space. An LS2020 rack should be at least 30 inches (76.2 cm) deep. A depth of 36 inches (91.4 cm) is recommended to ensure adequate clearance at the rear of the chassis for installing fantails and interface cables.
If you include access cards in your LS2020 chassis for any of the following types of interfaces, you must take into account the vertical rack space required for the fantails associated with the following cards:
The vertical rack space requirements for these types of interfaces are discussed in the following sections.
If you fully configure your LS2020 switch with nine low-speed interface modules or nine serial interface modules, the rack can accommodate a total of 18 V.35 and/or RS-449 fantails in some combination—two such fantails per card.
In the case of X.21 fantails, an LS2020 system requires only nine X.21 fantails—one per low-speed or serial interface card.
Each X.21, RS-449, or V.35 fantail requires 1.75 inches of vertical rack space (one rack unit, or 4.45 cm). Thus, in an LS2020 switch using V.35 or RS-449 fantails in any fantail combination totaling 18, 31.5 inches (80 cm) of vertical rack space are required.
If you configure the rack with less than the maximum number of V.35, RS-449, or X.21 fantails, or with a mixture of such fantails, you can install them physically adjacent to each other, or you can distribute them over the rack in a way that best suits your cabling and interconnection requirements.
An LS2020 switch that is fully configured with nine T3 or E3 access cards (T3AC or E3AC) can accommodate up to nine T3/E3 fantails (see Figure 3-18). Each fantail requires 1.75 inches of vertical rack space (one rack unit, or 4.45 cm).
You can arrange the T3/E3 fantails so that they are physically adjacent to each other, or you can disperse them over the available vertical rack space.
An LS2020 switch fully configured with a total of nine CEMAC access cards in any combination can accommodate a maximum of nine E1 fantails for 75-ohm applications (see Figure 3-21). Each E1 fantail requires 3.5 inches of vertical rack space (two rack units, or 8.9 cm).
Depending on the presence of other types of fantails in the LS2020 rack, you can position the E1 fantails on the rack to suit your particular cabling/interconnection requirements.
You should consider the factors described in the following sections when you select a location for your LS2020 switch.
Choose a location convenient to the data cables that you plan to connect to the LS2020 switch.
You should develop a plan for routing the external data cables. Such a plan might include the following:
An LS2020 chassis takes in cooling air through the bottom of the front panel and exhausts it at the top rear and top right side of the enclosure. The air vents on the right side can safely be covered with rack side panels, but they should not otherwise be blocked.
To minimize the potential for thermal problems with LS2020 circuitry, position the LS2020 chassis so that the air intake panel is not adjacent to the exhaust of other equipment. In addition, ensure that the LS2020 exhaust air is not near the air intake of other equipment.
To facilitate LS2020 maintenance and cable access, allow at least 2 feet of clearance at the front and rear of the LS2020 chassis. Figure 1-1 illustrates the overall clearance requirements of an LS2020 switch.
Ensure that the floor on which the LS2020 switch is to be placed can support its weight.
Using the information in Table 1-3, you can calculate the overall weight of your system. Add the weight of each optional component (interface module or fantail) to the weight of the base system, or redundant base system, to derive the total floor loading requirement.
 | Warning Never attempt to lift the chassis with the handles on the power supplies, disk assemblies, faceplates, or chassis enclosures. These handles are not designed to support the weight of the chassis. Using them to lift or support the chassis can result in severe damage to the equipment and serious bodily injury. |
The LS2020 physical environment during storage, transport, and operation must meet the specifications outlined in Table 1-4 .
To ensure that your HVAC system is capable of maintaining the proper operating temperature range for your LS2020 switch, refer to the LS2020 power consumption and heat dissipation characteristics outlined in Table 1-5 .
Each LS2020 chassis requires a dedicated branch circuit. If you equip your LS2020 switch with dual power cords, it is recommended that you provide an independent power source for each cord so as not to compromise the purposes of power redundancy.
The following notice applies to every LS2020 switch:
The LS2020 switch is designed to operate with all boards, bulkheads, filler panels, covers, and components (disks and blowers) in place and securely attached to the LS2020 chassis. When in place, these elements form an enclosure that:
Each LS2020 chassis requires at least one dedicated branch circuit. If your LS2020 system accommodates redundant power cords, it is recommended that you provide a dedicated branch circuit for each cord so as not to defeat the purposes of power redundancy. Table 1-6, Table 1-7, and Table 1-8 summarize the power requirements of an LS2020 switch.
| Power Option | Voltage | Current |
AC | 100 to 240 | 20A to 10A |
DC | 48 | 24A |
| Characteristic | Rating |
Inlet power connector | IEC 320 C20 |
Input voltage frequency phase | 100 to 240VAC, 50 to 60 Hz single |
Input current | 16A to 8A |
Power consumption1 | 975W maximum |
Heat dissipation1 | 3330 Btu/hr maximum |
1. See Table 1-5 for additional power-related information. | |
| Characteristic | Rating |
|---|---|
Input connections | Support for up to 2 separate -48VDC input feeds via 3-position terminal blocks |
Input voltage | -43 to -60VDC |
Input current | 24A |
Power consumption1 | 975W maximum |
Heat dissipation1 | 3330 Btu/hr maximum |
1. See Table 1-5 for additional power-related information. | |
To ensure the reachability of every LS2020 switch in the network in the event of unforeseen problems, you should obtain a modem for every switch card present in the chassis of every LS2020 switch in the network. (Each LS2020 chassis can accommodate up to two switch cards.)
The modem must be V.42 Hayes-compatible unit that is capable of operating at a minimum of 2400 baud.
The following modems have been tested and are known to be compatible with the LS2020 switch:
The following modems have been tested and are known to be incompatible with the LS2020 switch:
An LS2020 switch emits a maximum of 68 db(A) of noise.
Table 1-9 lists the environmental standards applicable to the LS2020 switch, while Table 1-10 lists the applicable interface standards for the switch.
| Environmental Factor | Applicable Standard |
Safety | |
Emissions | |
| 1. Certified by Underwriters Laboratories to Canadian requirements. | |
| Interface | Applicable Standard |
V.35 interface1 | |
RS-449 interface1 | |
X.21 interface1 | |
E3 interface1 | |
| 1. Host-independent approval. | |
The LightStream 2020 switch and its subassemblies are labeled with the CE mark. This mark has been affixed to indicate compliance with the following European directive:
Posted: Wed Oct 2 05:54:11 PDT 2002
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