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CHAPTER
Overview of the Router 1-1
1
Overview of the Router
The Cisco 2520/CPA2520, Cisco 2521/CPA2521, Cisco 2522/CPA2522, and
Cisco 2523/CPA2523 routers are full-featured multiport serial routers with synchronous
serial, LAN, and asynchronous/synchronous serial ports permitting use as a router or
communications server.
Note Throughout this publication, “the router” refers to the Cisco 2520/CPA2520,
Cisco 2521/CPA2521, Cisco 2522/CPA2522, and Cisco 2523/CPA2523 routers except
when specified otherwise.
Router Hardware Features
The multiport serial routers are available in the following configurations:
Cisco 2520/CPA2520 1 Ethernet port with a selectable attachment unit interface (AUI)
connection or 1 Ethernet 10BaseT connection
1 Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI)
port (RJ-45)
2 high-speed synchronous serial ports
2 low-speed asynchronous/synchronous serial ports
Cisco 2521/CPA2521 1 Token Ring shielded twisted pair (STP) port or 1 Token Ring
unshielded twisted-pair (UTP) port
1 ISDN BRI port (RJ-45)
2 high-speed synchronous serial ports
2 low-speed asynchronous/synchronous serial ports
- About This Guide 1
- Organization 2
- Conventions 2
- Overview of the Router 5
- Illo has been ordered 6
- Overview of the Router 1-3 7
- Router Hardware Features 7
- Port Configuration 8
- Remote Node Services 9
- Terminal Services 10
- Plain old 11
- IP or IPX 11
- System Specifications 12
- Obtaining Service and Support 13
- Cisco Connection Online 14
- Ordering Documentation 15
- Safety Recommendations 17
- General Site Requirements 20
- Configuring Equipment Racks 21
- Power Supply Considerations 22
- DTE or DCE 23
- Signaling Standards 25
- Router connections 27
- EIA/TIA-449 V.35 X.21 27
- EIA/TIA-232 EIA-530 27
- EIA/TIA-232 Connections 28
- EIA/TIA-449 Connections 28
- V.35 Connections 29
- X.21 Connections 30
- EIA-530 Connections 31
- Ethernet Connections 32
- Token Ring Connections 32
- BRI Connections 33
- Console Port Connections 34
- Auxiliary Port Connections 34
- Inspecting the System 35
- Installing the Router 37
- Setting Up the Chassis 38
- Rubber feet (5) 39
- Black adhesive strip 39
- Attaching the Brackets 40
- Installing the Router 3-5 41
- Wall-Mounting the Chassis 42
- Installing the Router 3-7 43
- DC Power Specifications 45
- Wiring the DC Power Supply 45
- Installing the Router 3-11 47
- Input: –40––72V 48
- Current: 1.5–1.0A 48
- Watts: 40W 48
- Connecting to a Network 49
- Installing the Router 3-15 51
- Specifications.” 53
- Installing the Router 3-19 55
- Input: 100-240VAC 56
- Freq: 50/60HZ 56
- Current: 1.2-0.6 A 56
- Configuring the Router 59
- Using Configuration Mode 61
- Using AutoInstall 62
- Using the Setup Facility 63
- Configuring the Router 64
- Configuring the Router 4-7 65
- Configuring the Router 4-11 69
- Setting Half-Duplex Mode 73
- Specifying the Boot Method 75
- Getting More Information 77
- Troubleshooting the Router 79
- Isolating Problems 80
- ° F (0to40°C) 80
- Reading the LEDs 81
- Maintaining the Router 83
- Opening the Chassis 84
- Screw Slot 85
- Flat-blade screwdriver 85
- CODE1 CODE0 86
- Upgrading the DRAM SIMM 87
- • ESD-preventive wrist strap 89
- • System-code SIMM(s) 89
- System-Code SIMM Replacement 90
- Maintaining the Router B-9 91
- Closing the Chassis 92
- Cable Specifications 95
- Identifying a Roll-Over Cable 96
- Token Ring Pinout 101
- EIA/TIA-232 104
- EIA/TIA-449 108
- <— indicates DCE to DTE 111
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