Table Of Contents
Overview of Cisco 3700 Series Routers
Modules, Interface Cards, and Memory
WAN and LAN Interface Numbering
WAN and LAN Interface Numbering
Internal -48 V Telephony Power Modules
Overview of Cisco 3700 Series Routers
Cisco 3700 series routers are modular access routers with LAN and WAN connections that can be configured by means of interchangeable network modules and interface cards.
This chapter describes the features and specifications of the routers and includes the following sections:
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Modules, Interface Cards, and Memory
Hardware Features
Cisco 3700 series includes the Cisco 3725 and the Cisco 3745 routers, which provide the following features:
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Cisco 3725
Cisco 3725 routers include the following additional features:
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Figure 1-1 shows the rear panel of the Cisco 3725 router.
Figure 1-1 Rear Panel of the Cisco 3725 Router
Cisco 3745
Cisco 3745 routers include the following additional features:
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Figure 1-2 shows the rear panel of the Cisco 3745 router.
Figure 1-2 Rear Panel of the Cisco 3745 Router
Modules, Interface Cards, and Memory
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For information on installing WICs and VICs, see the following documents:
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For information on installing AIMs, see the following documents:
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For information on installing DRAM, SDRAM, NVRAM, and CompactFlash memory, see:
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For information on installing CompactFlash memory cards, see:
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Memory
Cisco 3700 series routers support the following types of memory:
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Table 1-1 and Table 1-2 list processor and memory specifications for Cisco 3700 series routers.
Interface Numbering
This section describes numbering conventions for interfaces on Cisco 3725 and Cisco 3745 routers.
Cisco 3725 Interfaces
Each individual interface (port) on a Cisco 3725 router is identified by number, as described in the following sections.
WAN and LAN Interface Numbering
The Cisco 3725 router chassis contains the following WAN and LAN interface types:
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The numbering format is interface-type slot-number/interface-number. Two examples are:
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The slot numbers are as follows:
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Interface (port) numbers begin at 0 for each interface type, and continue from right to left and (if necessary) from bottom to top.
Figure 1-3 shows an example of interface numbering on a Cisco 3725 router with these interfaces:
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Figure 1-3 WAN and LAN Interface Numbering
The slot number for all WIC interfaces is always 0. (The W0 and W1 slot designations are for physical slot identification only.) Interfaces in the WICs are numbered from right to left, starting with 0/0 for each interface type, regardless of which physical slot the WICs are installed in. Some examples are as follows:
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Voice Interface Numbering
Voice interfaces are numbered as follows:
chassis-slot/voice-module-slot/voice-interface
If a 4-channel voice network module is installed in chassis slot 1, the voice interfaces are:
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Cisco 3745 Interfaces
Each individual interface (port) on a Cisco 3745 router is identified by number as described in the following sections.
WAN and LAN Interface Numbering
The Cisco 3745 router chassis contains the following WAN and LAN interface types:
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The numbering format is interface-type slot-number/interface-number. Two examples are:
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The slot numbers are as follows:
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If double-wide network modules are installed, the network module slots are numbered as follows:
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Interface (port) numbers begin at 0 for each interface type, and continue from right to left and from bottom to top.
Figure 1-4 shows the rear panel of the Cisco 3745 with:
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The slot number for all WIC interfaces is always 0. (The W0, W1, and W2 slot designations are for physical slot identification only.) Interfaces in the WICs are numbered from right to left, starting with 0/0 for each interface type, regardless of which physical slot the WICs are installed in. Some examples are:
If physical slot W0 is empty and physical slot W1 contains a 1-port serial WIC, the serial interface in the WIC is numbered Serial 0/0.
If slot W0 contains a 2-port serial WIC and slot W1 contains a 1-port serial WIC, the serial interfaces in physical slot W0 are numbered Serial 0/0 and Serial 0/1, and the serial interface in physical slot W1 is numbered Serial 0/2.
If slot W0 contains a 2-port serial WIC and slot W1 contains a 1-port BRI WIC, the serial interfaces in physical slot W0 are numbered Serial 0/0 and Serial 0/1, and the BRI interface in physical slot W1 is numbered BRI 0/0.
Figure 1-4 Cisco 3745 Rear Panel
Voice Interface Numbering
Voice interfaces are numbered differently from the WAN interfaces described in the previous section. Voice interfaces are numbered as follows:
network-module-slot/voice-module-slot/voice-interface
If a 4-channel voice network module is installed in chassis slot 1, the voice interfaces are:
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Power Supply Options
Table 1-3 lists the power supply options supported by Cisco 3700 series routers. Depending on the configuration specified when you placed your order, your router may not support all of these options.
Table 1-3 Power Supply Options for Cisco 3700 Series Routers
AC input power
Yes
Yes
DC input power
Yes
Yes
-48-V telephony power module to provide inline power to IP phones
Yes
Yes
Dual hot-swappable power supplies
No
Yes1
Compatible with Cisco Redundant Power System
Yes
Yes
1 Because of increased power consumption in high-temperature environments, a fully loaded Cisco 3745 router requires both power supplies when ambient temperature exceeds 104°F (40°C). Cisco 3745 routers operating under these conditions do not support the online replacement of power supplies.
Internal -48 V Telephony Power Modules
Cisco 3700 series routers provide inline power to IP phones connected to the router through Ethernet switch network modules. This power is supplied by special -48 V modules that connect directly to the chassis power supplies in Cisco 3725 and Cisco 3745 routers. A single -48 V power module meets the power needs of up to 36 IP phones. A Cisco 3745 router with two -48 V power modules installed provides redundant power for up to 36 IP phones. Figure 1-5 and Figure 1-6 show the -48 -V power modules as they appear when installed in Cisco 3700 series routers.
Figure 1-5 Cisco 3725 Router with Optional -48 V Power Module Installed
Figure 1-6 Cisco 3745 Router with Optional -48 V Power Modules Installed
System Specifications
Table 1-4 and Table 1-5 list Cisco 3700 series system specifications.
Table 1-4 Cisco 3725 Router System Specifications
Dimensions (H x W x D)
3.5 x 17.1 x 15.0 in. (8.9 x 43.4 x 38.1 cm), 2-RU chassis height
Weight
14 lb (6.4 kg)
Input voltage, AC power supply
Frequency
Input surge current (AC)100 to 240 VAC, autoranging
47-63 Hz
50 A maximum, one cycle (-48-V power module included)Input rating, DC power supply
Input surge current (DC)
24-36 VDC, 9 A, positive or negative, operational from 18-36 VDC
36-60 VDC, 4 A, positive or negative, operational from 36-72 VDC
50 A, < 10 ms
Power dissipation
135 W (maximum)
Heat Dissipation
135W Maximum 460.661 BTU/hour, 495W Maximum 1689.089 BTU/hour
Console and auxiliary ports
RJ-45 connector
Operating humidity
5-95%, noncondensing
Operating temperature
32-104×F (0-40×C)
Nonoperating temperature
-40 to 162×F (-40 to 72×C)
Noise level
52 dBA (maximum)
Regulatory compliance
FCC Part 15 Class A.
For additional compliance information, see the Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Regulatory Compliance and Safety Information document that accompanied the router.
Safety compliance
UL 60950; CAN/CSA C22.2 No. 60950-00; IEC 60950; AS/NZS 3260; TS001
Table 1-5 Cisco 3745 Router System Specifications
Dimensions (H x W x D)
5.25 x 17.25 x 15.00 in. (13.3 x 43.8 x 38.1 cm), 3-RU chassis height
Weight
32 lb (14.5 kg), including chassis and four network modules
Input voltage, AC power supply
Frequency
Input surge current (AC)100-240 VAC, autoranging
47-63 Hz
80 A maximum, one cycle (-48-V power module included)Input rating, DC power supply
Operational between
Input surge current (DC)-48 to -60 VDC, 10 A maximum
-38 to -75 VDC, 10 A maximum
50 A, < 10 msPower dissipation
230 W (maximum)
Heat Dissipation
230W Maximum 784.829 BTU/hour, 590W Maximum 2013.257 BTU/hour
Console and auxiliary ports
RJ-45 connector
Operating humidity
5-95%, noncondensing
Operating temperature
32-104×F (0-40×C)1
Nonoperating temperature
-40 to 162×F (-40 to 72×C)
Noise level
60 dBA (maximum)
Regulatory compliance
FCC Part 15 Class A.
For additional compliance information, see the Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Regulatory Compliance and Safety Information document that accompanied the router.
Safety compliance
UL 60950; CAN/CSA C22.2 No. 60950-00; IEC 60950; AS/NZS 3260; TS001
1 Because of increased power consumption in high-temperature environments, a fully loaded Cisco 3745 router requires both power supplies when ambient temperature exceeds 104°F (40°C).
Regulatory Compliance
For compliance information, see the Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Regulatory Compliance and Safety Information document that accompanied the router.
