Table of Contents

Overview of the Cisco 3620 Router

Features
Specifications
Identifying Network Interfaces
Slot Numbering
Unit Numbering
Memory

Overview of the Cisco 3620 Router

The Cisco 3620 router, a member of the Cisco 3600 series of routers, is a two-slot modular access router whose LAN and WAN connections can be configured by means of interchangeable network modules and WAN interface cards. The modular design of the router provides flexibility, allowing you to configure the router to your needs and to reconfigure it if your needs change.

Figure 1-1 shows the front panel of the router.

Figure 1-1 : Front Panel of the Cisco 3620 Router

Features

The features of the Cisco 3620 router include the following:

• High-performance 80-MHz Reduced Instruction Set Computer (RISC) processor
  

• Slots for two network modules
  

• Slots for two Personal Computer Memory Card International Association (PCMCIA) cards
  

• Flash memory
  

• Four slots for dynamic random-access memory (DRAM), which you can configure as shared memory or main (processor) memory
  

• Supports connection to an optional external redundant power supply
  

• High-speed console and auxiliary ports (up to 115.2 kbps)
  

• Hardware thermal alarm to warn of excessively high operating temperature
  

• Mounting in a 19-inch, 23-inch, or 24-inch rack, on a wall, on a desk, or on a tabletop
  

Specifications

Table 1-1 lists the module interface options available for the router. Some of the modules provide two empty slots which accept optional WAN interface cards. Table 1-2 lists the WAN interface cards available for the router.

Table 1-1 Module Interface Options

Module	Port Option	Part Number
1 Ethernet 2 WAN card slot	One Ethernet port, slots for two WAN interface cards	NM-1E2W
2 Ethernet 2 WAN card slot	Two Ethernet ports, slots for two WAN interface cards	NM-2E2W
1 Ethernet 1 Token Ring, 2 WAN card slot	One Ethernet port, one Token Ring port, slots for two WAN interface cards	NM-1E1R2W
Asynchronous/synchronous serial	Four ports Eight ports	NM-4A/S NM-8A/S
ISDN1-BRI2	Four ports Eight ports	NM-4B-S/T NM-8B-S/T
ISDN-BRI with NT13	Four ports Eight ports	NM-4B-U NM-8B-U
Channelized T1/ISDN-PRI4	One port Two Ports	NM-1CT1 NM-2CT1
Channelized T1/ISDN-PRI with CSU5	One port Two ports	NM-1CT1-CSU NM-2CT1-CSU
Channelized E1/ISDN-PRI balanced	One port Two ports	NM-1CE1B NM-2CE1B
Channelized E1/ISDN-PRI unbalanced	One port Two ports	NM-1CE1U NM-2CE1U

¹ ISDN = Integrated Services Digital Network
² BRI = Basic Rate Interface
³ NT1 = Network Termination 1
⁴ PRI = Primary Rate Interface
⁵ CSU = channel service unit

Table 1-2 : WAN Interface Card Options

WAN Interface Card	Port Option	Part Number
1-port serial	Synchronous serial EIA/TIA-2321, EIA/TIA-449, V.35, X.21, or EIA-530	WIC-1T
1-port ISDN-BRI	One BRI port with S/T interface	WIC36-1B-S/T
1-port ISDN-BRI with NT1	One BRI port with U interface	WIC36-1B-U

¹ EIA/TIA-232 and EIA/TIA-449 were known as recommended standards RS-232 and RS-449 before their acceptance as standards by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA).

Table 1-3 lists the specifications of the router.

Table 1-3 System Specifications

Description	Specification
Dimensions (H x W x D)	1.75 x 17.5 x 13.5" (4.4 x 44.5 x 34.2 cm), 1 rack unit in height
Weight	15 lb (6.8 kg), maximum including chassis and two network modules
Input voltage, AC power supply Current Frequency Power dissipation	100 to 240 VAC, autoranging 1.0A 50/60 Hz 60 W (maximum)
Input voltage, DC power supply Current Power dissipation	38 to 72 VDC 3.0 A 60W (maximum)
Console and Auxiliary ports	RJ-45 connector
Operating humidity	5 to 95%, noncondensing
Operating temperature	32 to 104°F (0 to 40°C)
Nonoperating temperature	--40 to 185°F (--40 to 85°C)
Noise level	45 dBA maximum
Regulatory compliance	FCC Part 15 Class B. For additional compliance information, refer to the Regulatory Compliance and Safety Information document.

Identifying Network Interfaces

Each individual network interface on the router is identified by a slot number and a unit number.

Slot Numbering

The two chassis slots used to mount network modules are numbered 0 and 1, as follows:

• Slot 0 is on the right (as viewed from the rear of the chassis), near the power supply. (See Figure 1-2.)
  

• Slot 1 is on the left.
  

These slot numbers correspond to the two sets of LEDs on the front panel of the chassis. The slot number is used as part of the identification of the network interfaces installed in the router. WAN interface cards are identified by the slot number of the network module in which they are installed.

You can install any network module into any available slot in the chassis.