Warning Before you install, operate, or service the system, read the Site Preparation and Safety Guide. This guide contains important safety information you should know before working with the system.

Site Requirements

This section provides site power requirements for the Cisco 7609 Internet Router. You should verify the site power prior to installing the switch. Power requirements vary for each switch; ensure that you verify the site power for the type of switch you are installing.

For EMI recommendations, refer to the Site Preparation and Safety Guide.

Environmental Requirements

Insure adequate spacing between racks using the information in Table 2-1. Keep all of the vents clear of obstructions, including dust and foreign conductive material, and away from the exhaust ports of other equipment.

Table 2-1 Chassis Airfow Requirements
Chassis Model	Airflow Intake	Airflow Exhaust	Air Filter Option	Minimum Clearance (walls)	Minimum Horizontal Separation
OSR-7609 (Figure 1-2)	Front, rear	Front, rear, left side, right side	No	6 in (15 cm)	12 in (30.5)

Heat dissipation is an important consideration for sizing the air-conditioning requirements for an installation. The power and heat associated with a Cisco 7609 Internet Router varies based upon these considerations:

•Power supply type

•Module types and quantities

•Average traffic levels

Unless otherwise noted, the information in Table 2-2 and Table 2-3 assumes worst-case conditions (with GBICs and port adapters installed, if applicable). Typical numbers are approximately 30 percent below the numbers listed here. See Table 2-4 for a sample calculation of a switch configuration.

Table 2-2 AC Power Requirements and Heat Dissipation
Model Number/ Module Type	AC-Input Power (Watts)	DC-Output Power (Watts)	Heat Diss. (BTU/HR)	Input Current
Model Number/ Module Type	AC-Input Power (Watts)	DC-Output Power (Watts)	Heat Diss. (BTU/HR)	90 VAC (Amps)	120 VAC (Amps)	180 VAC (Amps)	240 VAC (Amps)
Cisco 7609 Internet Router chassis (with fans)	155	75	530	1.71	1.29	0.86	0.65
WS-X6K-S2U-MSFC2	181.65	129	549	1.79	1.34	0.89	0.67
OSM-2OC12-POS-MM, -SI, -SL OC-12 POS, 2-port	176	141	602	1.96	1.47	0.98	0.74
OSM-4OC12-POS-MM, -SI, -SL OC-12 POS, 4-port	251	201	857	2.79	2.09	1.39	1.05
OSM-4OC12-POS-SI+ OC-12 POS, 4-port	239	191	816	2.65	1.99	1.33	1.00
OSM-4OC3-POS-SI OC-3 POS, 4-port	128	102	437	1.42	1.07	0.71	0.53
OSM-8OC3-POS-MM, -SI, -SL OC-3 POS, 8-port	187	150	640	2.08	1.56	1.04	0.78
OSM-16OC3-POS-MM, -SI, -SL OC-3 POS, 16-port	267	214	913	2.97	2.23	1.48	1.11
OSM-16OC3-POS-SI+ OC-3 POS, 16-port	252	202	861	2.80	2.10	1.40	1.05
OSM-2OC12-ATM-MM, -SI OC-12 ATM, 2-port	190	152	649	2.11	1.58	1.06	0.79
OSM-2OC12-ATM-MM+, -SI+ OC-12 ATM, 2-port	210	168	717	2.33	1.75	1.17	0.88
OSM-1OC48-POS-SS, -SI, -SL OC-48 POS, 1-port	223	179	762	2.48	1.86	1.24	0.93
OSM-1OC48-POS-SS+, -SI+, -SL+ OC-48 POS, 1-port	205	164	699	2.28	1.71	1.14	0.85
OSM-12CT3/T1 Channelized T-3 to DS-0, 12-port	147	118	502	1.63	1.23	0.82	0.61
OSM-1CHOC12/T1-SI Channelized OC-12/STM-4 to DS-0, 1 port	147	118	502	1.63	1.23	0.82	0.61
OSM-1CHOC12/T3-SI Channelized OC-12, 1-port	231	185	789	2.57	1.93	1.28	0.96
OSM-1CHOC48/T3-SS Channelized OC-48, 1-port	197	158	672	2.19	1.64	1.09	0.82
OSM-2OC48/1DPT-SS, -SI, -SL OC-48 DPT¹/POS, 2-ports	302	242	1031	3.35	2.52	1.68	1.26
OSM-4GE-WAN-GBIC² Gigabit Ethernet WAN Services Module, 4-port	188	151	644	2.09	1.57	1.05	0.79
WS-C6500-SFM Switch Fabric Module	146	117	500	1.63	1.22	0.81	0.61
WS-X6500-SFM2 Switch Fabric Module 2	162	130	554	1.80	1.35	0.90	0.68
WS-X6182-2PA FlexWAN module	125	100	427	1.39	1.04	0.69	0.52
WS-X6348-RJ-45 10/100BASE-TX, 48-port	125	100	428	1.39	1.05	0.70	0.52
WS-X6516-GBIC2 1000BASE-X (SX, LX/LH, ZX), 16-port	179	143	610	1.98	1.49	0.99	0.74

¹DPT = Dynamic Packet Transport

²GBICs = Gigabit Interface Converters

Table 2-3 DC Power Requirements and Heat Dissipation
Module Number/Module Type	DC-Input Power (Watts)	Heat Diss. (BTU/HR)	Input Current
Module Number/Module Type	DC-Input Power (Watts)	Heat Diss. (BTU/HR)	48 VDC (Amps)	60 VDC (Amps)
Cisco 7609 Internet Router chassis (with fans)	167	569	3.47	2.78
WS-X6K-S2U-MSFC2	173	590	3.6	2.88
OSM-2OC12-POS-MM, -SI, -SL OC-12 POS, 2-port	190	648	3.95	3.16
OSM-4OC12-POS-MM, -SI, -SL OC-12 POS, 4-port	270	921	5.62	4.50
OSM-4OC12-POS-SI+ OC-12 POS, 4-port	257	877	5.35	4.28
OSM-4OC3-POS-SI OC-3 POS, 4-port	138	4.70	2.87	2.30
OSM-8OC3-POS-MM, -SI, -SL OC-3 POS, 8-port	202	688	4.20	3.36
OSM-16OC3-POS-MM, -SI, -SL OC-3 POS, 16-port	287	981	5.99	4.79
OSM-16OC3-POS-SI+ OC-3 POS, 16-port	271	925	5.65	4.52
OSM-2OC12-ATM-MM, -SI OC-12 ATM, 2-port	204	698	4.26	3.41
OSM-2OC12-ATM-MM+, -SI+ OC-12 ATM, 2-port	226	771	4.70	3.76
OSM-1OC48-POS-SS, -SI, -SL OC-48 POS, 1-port	240	819	5.00	4.00
OSM-1OC48-POS-SS+, -SI+, -SL+ OC-48 POS, 1-port	220	752	4.59	3.67
OSM-12CT3/T1 Channelized T-3 to DS-0, 12-port	158	540	3.29	2.63
OSM-1CHOC12/T1-SI Channelized OC-12/STM-4 to DS-0, 1 port	158	540	3.29	2.63
OSM-1CHOC12/T3-SI Channelized OC-12, 1-port	248	848	5.17	4.14
OSM-1CHOC48/T3-SS Channelized OC-48, 1-port	212	723	4.41	3.53
OSM-2OC48/1DPT-SS, -SI, -SL OC-48 DPT¹/POS, 2-ports	325	1108	6.76	5.41
OSM-4GE-WAN-GBIC² Gigabit Ethernet WAN Services Module, 4-port	203	692	4.22	3.38
WS-C6500-SFM Switch Fabric Module	158	538	3.28	2.63
WS-X6500-SFM2 Switch Fabric Module 2	174	596	3.63	2.91
WS-X6182-2PA FlexWAN module	134	459	2.80	2.24
WS-X6348-RJ-45 10/100BASE-TX, 48-port	135	461	2.81	2.85
WS-X6516-GBIC2 1000BASE-X (SX, LX/LH, ZX), 16-port	192	655	4.00	3.20

¹DPT = Dynamic Packet Transport

²GBICs = Gigabit Interface Converters

Table 2-4 provides a sample calculation of power and heat dissipation for the following switch configuration:

•Cisco 7609 Internet Router chassis (including AC-input power supplies)

•Two WS-X6K-S2U-MSFC2 supervisor engines

•One Switch Fabric Module

•Two 4-port OC-12 POS modules

•Two 8-port OC-3 POS modules

Table 2-4 Sample Calculation
Model Number/ Module Type	AC-Input Power (Watts)	DC-Output Power (Watts)	Heat Diss. (BTU/HR)	Input Current
Model Number/ Module Type	AC-Input Power (Watts)	DC-Output Power (Watts)	Heat Diss. (BTU/HR)	90 VAC (Amps)	120 VAC (Amps)	180 VAC (Amps)	240 VAC (Amps)
Cisco 7609 Internet Router chassis (with fans)	124	50	422	1.37	1.03	0.69	0.52
WS-X6K-S2U-MSFC2	322	258	1098	3.58	2.68	1.78	1.34
WS-C6500-SFM Switch Fabric Module	146	117	500	1.63	1.22	0.81	0.61
OSM-4OC12-POS-MM 4-port OC-12 module	502	402	1714	5.58	4.18	2.78	2.10
OSM-8OC3-POS-MM 8-port OC-3 module	374	300	1280	4.16	3.12	2.08	1.56
Total	1468	1127	5014	16.32	12.23	8.14	6.13

Power Requirements

Follow these requirements when preparing your site for the switch installation:

•The redundant power option provides a second, identical power supply to ensure that power to the chassis continues uninterrupted if one power supply fails or input power on one line fails.

•In systems configured with the redundant power option, connect each of the two power supplies to a separate input power source. If you fail to do this, your system might be susceptible to total power failure due to a fault in the external wiring or a tripped circuit breaker.

•To prevent a loss of input power, be sure the total maximum load on each circuit supplying the power supplies is within the current ratings of the wiring and breakers.

•In some systems, you might use an uninterruptible power supply (UPS) to protect against power failures at your site. Avoid UPS types that use ferroresonant technology. These UPS types can become unstable with systems like the Cisco 7609 Internet Router, which can have substantial current draw fluctuations due to bursty data traffic patterns.

Use the information in Table 2-2 to estimate the power requirements and heat dissipation of a Cisco 7609 Internet Router based on a given configuration of the switch. Table 2-4 provides a sample calculation. Determining power requirements might be useful for planning the power distribution system needed to support the switch.

Power Connection Guidelines

This section provides the guidelines for connecting the Cisco 7609 Internet Router AC and DC power supplies to the site power source.

•AC-Powered Systems

•DC-Powered Systems

AC-Powered Systems

Basic guidelines include the following:

•Each chassis power supply should have its own dedicated branch circuit.

•For North America, the circuit breaker should be rated 20A for the 2500W power supply and 30A for the 4000W power supply. For everywhere else, the circuit breaker should be sized according to the power supply input rating and local or national code requirements.

•If you are using a 200/240 VAC power source in North America, the circuit must be protected by a dedicated two-pole circuit breaker.

•The source AC outlet must be within 6 feet (1.8 meters) of the system and should be easily accessible.

•The AC power receptacles used to plug in the chassis must be the grounding type. The grounding conductors that connect to the receptacles should connect to protective earth ground at the service equipment.

Two types of AC-input power supplies are available:

•2500W—Figure 2-1 shows the different styles of 2500W AC-input power cord plugs that are available for North America or various international locales. Figure 2-1 also shows the appliance coupler that is attached to the other end of the 2500W power supply power cord. Table 2-5 lists the AC-input power cord options and Cisco product numbers.

•4000W—Figure 2-2 shows the two different styles of AC-input power cord plugs that are available for North America and international locales. Unlike the other power supplies, the 4000W power supply power cord is hardwired to the power supply and cannot be removed.

Figure 2-1 AC Power Cord Plugs and Appliance Coupler for the 2500W Power Supply

Figure 2-2 AC Power Cord Connectors for the 4000W Power Supply

Table 2-5 AC-Input Power Cord Options
Locale	Description	Product Number
2500W Power Supply ( WS-CAC-2500W=)
North America (nonlocking)	12 AWG, 16A/250V	CAB-AC-2500W-US1=
North America (locking)	12 AWG, 16A/250V	CAB-AC-C6K-TWLK=
Europe	2.5 mm, 16A/250V	CAB-AC-2500W-EU=
International	2.5 mm, 16A/250V	CAB-AC-2500W-INT=

DC-Powered Systems

Basic guidelines include the following:

•Each chassis power supply should have its own dedicated input power source.

•The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be sized according to the power supply input rating and local or national code requirements.

•The circuit breaker is considered the disconnect device and should be easily accessible.

•The power supply ground should connect to protective earth ground even though the system ground connection is provided.

•The DC return is to remain isolated from the system frame and chassis (DC-I).

Site Preparation Checklist

Table 2-6 lists the site planning activities that you should perform prior to installing the Cisco 7609 Internet Router. Completing each activity helps ensure a successful switch installation.

Table 2-6 Site Planning Checklist
Task No.	Planning Activity	Verified By	Time	Date
1	Space evaluation: Space and layout Floor covering Impact and vibration Lighting Maintenance access
2	Environmental evaluation: Ambient temperature Humidity Altitude Atmospheric contamination Airflow
3	Power evaluation: Input power type Power receptacles Receptacle proximity to the equipment Dedicated (separate) circuits for redundant Power supplies UPS for power failures DC systems: Proper gauge wire and lugs
4	Grounding evaluation: Circuit breaker size CO ground (AC- and DC-powered systems)
5	Cable and interface equipment evaluation: Cable type Connector type Cable distance limitations Interface equipment (transceivers)
6	EMI evaluation: Distance limitations for signaling Site wiring RFI levels

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Cisco 7609 Router Installation Guide (OSR-7609)

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Chapter: Preparing for Installation

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