What is the difference between the CISCO1720 and the CISCO1721?

The Cisco 1720 modular access router has been a very popular choice for small businesses looking for WAN connectivity, such as ISDN and T1.  The CISCO1720 was end-of-lifed by Cisco on August 1, 2003.  The replacement router was the CISCO1721.  This article looks at both routers and explains the difference between the two.

Both the CISCO1720 and CISCO1721 include the following:

One autosensing 10/100 Fast Ethernet port
2 WAN Interface Card slots (WIC)
One AUX Port
One Console Port
One Internal expansion slot for VPN encryption card (MOD1700-VPN)

The updated and newer CISCO1721 differs in the following:

Routing Performance: +40%
DRAM (Default/Maximum): 32MB/96MB  (Compared to 32MB/48MB on CISCO1720)
Flash (Default/Maximum): 16MB/16MB (Compared to 8MB/16MB on CISCO1720)
IEEE 802.1Q VLAN Routing: Yes
Encryption Module LED: Yes

To summarize, the CISCO1721 offer higher performance, increased memory capacity and additional functionality as compared to the CISCO1720.

If you are ever in the market for a Cisco CISCO1720 or CISCO1721, Teksavers in Austin, TX buys and sells new & used cisco  CISCO1720 and CISCO1721 routers and can save you up to 90% off list price.  With their SAFE Guard program, you are assured of getting a used router in excellent working condition with a 1 year warranty included.

Cisco CISCO3745 Router Discussion

Manufacturer: Cisco

Model: CISCO3745

The CISCO3745 is a two port 10/100 router with 2 AIM slots, 3 WIC slots and 4 NM slots.   The CISCO3745 was a replacement to the CISCO3640.  The CISCO3745 has been End Of Lifed and has been replaced by the CISCO3845 Router.

The CISCO3745 is meant for medium to large-sized offices/businesses and has the ability to support data, security, voice and advanced services at wire speeds up to T3/E3 rates.

The CISCO3745 also sports high availability and resiliency utilizing redundant power supplies.

Key features for the CISCO3745:

• Two Integrated 10/100 LAN ports
• Two Integrated Advanced Integration Modules (AIM) slots
• Three Integrated WAN Interface Card (WIC) slots
• Four (Cisco 3745) Network Module (NM) slots
• Two (Cisco 3745) High Density Service Module (HDSM)-capable slots
• 32MB Compact Flash (default); 128MB maximum
• 256MB DRAM (default, single 256MB DIMM); 512MB DRAM maximum
• Optional In-Line Power for 16-port EtherSwitch NM and 36-port EtherSwitch HDSM
• Support for all major WAN protocols and media: LL, FR, ISDN, X.25, ATM, fractional T1/E1, T1/E1, xDSL, T3/E3, HSSI
• Support for selected NMs, WICs and AIMs from the Cisco 1700, 2600 and 3600 Series 2 RU (Cisco 3725) or 3 RU (Cisco 3745) Rack-mountable chassis

If you are ever in the market for a Cisco CISCO3745, Teksavers in Austin, TX buys and sells new & used cisco  CISCO3745 switches and can save you up to 90% off list price.  With their SAFE Guard program, you are assured of getting a used switch in excellent working condition with a 1 year warranty included.

What is a Cisco WIC-1DSU-T1?

The Cisco WIC-1DSU-T1 is an integrated network module for T1 or fractional T1 service.  Does not require an external CSU/DSU.  This WIC is supported on the Cisco 1600, 1700, 2600 and 3600 series routers.

Here are some of the key features of the WIC-1DSU-T1:

-T1 or fractional T1 network interface
-N X 64 kbps or N X 56 kbps, nonchannelized data rates (N = 1 to 24)
-Standards based, including ANSI T1.403 and AT&T Publication 62411
-Full management features

Official Cisco Product Number and Description

WIC-1DSU-T1 - One-port T1/fractional T1 DSU/CSU WAN interface card

Over the last few years counterfeit units coming in from China have hit the market.  Buyers should be aware of this issue and learn how to spot a counterfeit WIC-1DSU-T1 before purchasing.

If you are ever in the market for a Cisco WIC-1DSU-T1, Teksavers in Austin, TX buys and sells genuine new & used cisco WIC-1DSU-T1 interface modules and can save you up to 90% off list price.  With their SAFE Guard program, you are assured of getting a used WIC-1DSU-T1 in excellent working condition with a 1 year warranty included.

The Cisco Catalyst WS-C2948G-L3 has remained a very popular choice for customer looking for a 48 - Port Layer 3 switch.  The switch runs Cisco IOS and is derived from the Cisco Catalyst 8540.

The WS-C2948G-L3 is a 48 Port 10/100Base TX Ethernet Switch with 2 1000BaseX GBIC Gigabit ports.  It used the cat2948g-in-mz Cisco IOS image.  Specifications are as follows:

Switching Components
Backplane	20 Gbps full duplex
Microprocessor	150-MHz R5000 RISC
Memory	64 MB of SDRAM, 16 MB of Flash ROM (onboard), 128 KB of NVRAM, 12 MB of synchronous SRAM, 256 bytes serial EEROM
Physical Characteristics
Dimensions (H x W x D)	2.69 x 17.1 x 18 in. (6.6 x 43.4 x 45.7 cm)
Weight	18 lb. (8.08 kg)

If you are ever in the market for a Cisco WS-C2948G-L3, Teksavers in Austin, TX buys and sells new & used cisco WS-C2948G-L3 switches and can save you up to 90% off list price.  With their SAFE Guard program, you are assured of getting a used switch in excellent working condition with a 1 year warranty included.