Nortel 221 DM1401162 ユーザーズマニュアル

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Nortel is a recognized leader in delivering communications capabilities that enhance 
the human experience, ignite and power global commerce, and secure and protect the
world’s most critical information. Serving both service provider and enterprise customers,
Nortel delivers innovative technology solutions encompassing end-to-end broadband,
Voice over IP, multimedia services and applications, and wireless broadband designed to
help people solve the world’s greatest challenges. Nortel does business in more than 150
countries. For more information, visit Nortel on the Web at 

For more information, contact your Nortel representative, or call 1-800-4 NORTEL or 
1-800-466-7835 from anywhere in North America.

This is the Way. This is Nortel, Nortel, the Nortel logo, the Globemark and Contivity are
trademarks of Nortel Networks. All other trademarks are the property of their owners.

Copyright © 2005 Nortel Networks. All rights reserved. Information in this document is
subject to change without notice. Nortel assumes no responsibility for any errors that
may appear in this document.

In the United States:

Nortel, 35 Davis Drive
Research Triangle Park, NC 27709 USA

In Canada:

Nortel, 8200 Dixie Road, Suite 100
Brampton, Ontario L6T 5P6 Canada

In Caribbean and Latin America:

Nortel, 1500 Concorde Terrace
Sunrise, FL 33323 USA

In Europe:

Nortel 
Maidenhead Office Park, Westacott Way
Maidenhead Berkshire SL6 3QH UK
Phone: 00800 8008 9009 or
+44 (0) 870-907-9009

In Asia Pacific:

Nortel 
Nortel Networks Centre, 1 Innovation Drive
Macquarie University Research Park
Macquarie Park NSW 2109 Australia
Tel: +61 2 8870 5000

In Greater China:

Nortel, Sun Dong An Plaza
138 Wang Fu Jing Street
Beijing 100006, China
Phone: (86) 10 6510 8000

• 10/100 Mbps Ethernet (RJ-45)

• 4-port 10/100 Mbps Auto-sensing 

Ethernet switch

• Console port (RS-232, DB-9f)

VPN Router 221 — up to 5 tunnels

Technical specifications — physical and operational

Length: 7.4" (188 mm)

Width: 5.0" (128 mm)

Height: 1.4"   (36 mm)

Weight: 10.9 oz. (310 grams)

9.0 Mbps for 3DES

• 4-port 10/100 Mbps Ethernet switch

• ADSL – G.992.1 Annex A, Annex B or U-R2

• Console port (RS-232, DB-9f)

Length: 9.1" (230 mm)

Width:

6.3" (161 mm)    

Height: 2.1"   (53 mm)

Weight: 1.0 lbs.  (468 grams)

4.5 Mbps for 3DES

VPN Router 251 — up to 5 tunnels

• ITU G.992.1 (G.DMT) 

• G.992.1 Annex A – ADSL over POTS 

• ITU G.992.2 (G.Lite) 

• RADSL – ANSI T1.413 Issue 2 

• DSL Forum document TR-042 ATM 

• Transport over ADSL 

• G.hs 994.1 

• G.ploam G.997.1 

• Auto negotiation rate adaptation 

• RFC 2364 – PPP over AAL5 

• RFC 2684 – MPoA; both bridged and routed encapsulation 

• British Telecom SIN 329; BT Broadband IP Product requirements for

End User NTE equipment 

• RFC  2516 – PPPoE 

• Traffic shaping UBR, CBR 

• ATM Forum UNI 3.1/4.0 PVC