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  Zyxel 4-Port ZyWALL 2 Plus Security Appliance
$146 at Dell SMB Overall Rating: 8.8
$145.99

Found at 1 store

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  ZyXEL ZyWALL 2 PLUS Internet Security Firewall, 4 Port 10/100 Fast Ethernet Switch, w/ 5 IPSec VPN Tunnels
$127 at Amazon.com Overall Rating: 9.0
$127.47

Found at 1 store

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 Adtran Switch DSU/CSU Adtran Switch DSU/CSU
-Data Transfer Rate: 1.5 MBps - ISDN, HDLC
$1,603 to $2,048

Found at 10 stores

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 Cisco expansion module - 4 ports Cisco expansion module - 4 ports
Expansion module - HDLC, Frame Relay - ISDN PRI - 4 ports - T-1.
$223 to $4,712

Found at 2 stores

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 3Com SuperStack Other 3Com SuperStack Other
10 Mbps - 10 Base T - Ethernet, ISDN Connection - PC

$249.00

Found at 1 store

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 Adtran ISU ISU 2x64 Concentrators & Multiplexers Adtran ISU ISU 2x64 Concentrators & Multiplexers
Multiplexor - external
$60 to $743

Found at 4 stores

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 Adtran TSU 100 T1/FT1 DSU/CSU with Embedded SNMP. (1202052L2) Adtran TSU 100 T1/FT1 DSU/CSU with Embedded SNMP. (1202052L2)
The TSU 100ā?¢ from ADTRANĀ® is a modular, full-featured T1/FT1 Multiplexer designed to support a wide range of
$1,334 to $1,655

Found at 2 stores

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 Adtran Smart 16e Network Devices Adtran Smart 16e Network Devices
Modular expansion base - 0 / 16
$2,577 to $2,960

Found at 3 stores

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 Cisco FlexWAN Switch Ethernet Expansion Module Cisco FlexWAN Switch Ethernet Expansion Module
Token Ring, Ethernet, FDDI, ATM, ISDN, HSSI, Fast Ethernet, Frame Relay, Gigabit Ethernet, HDLC, SONET/SDH - 128 MB
$80 to $145

Found at 2 stores

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 Adtran ISU 512e Concentrators & Multiplexers Adtran ISU 512e Concentrators & Multiplexers
Multiplexor - 4 ports - external

$181.11

Found at 1 store

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 Adtran ISU 512 Concentrators & Multiplexers Adtran ISU 512 Concentrators & Multiplexers
Multiplexor - 4 ports - external
$1,996 to $2,730

Found at 2 stores

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  Netgear RT328 ISDN Router
$150 at Clearance.net Not yet rated
$149.99

Found at 1 store

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 Adtran ISU 512 Concentrators & Multiplexers Adtran ISU 512 Concentrators & Multiplexers
Multiplexor

$2,555.76

Found at 1 store

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  Superlooper ISDN (PRI) Crossover Adapter
$6 at CablesAndKits.com Overall Rating: 9.1
$5.95

Found at 1 store

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  Superlooper ISDN (PRI) Loopback Tool
$6 at CablesAndKits.com Overall Rating: 9.1
$5.95

Found at 1 store

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  Superlooper ISDN (BRI) Loopback Tool
$6 at CablesAndKits.com Overall Rating: 9.1
$5.95

Found at 1 store

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  Cisco 3640 Multifunction Router Bundle - 64D/16F, No Faceplate
$50 at CablesAndKits.com Overall Rating: 9.1
$49.95

Found at 1 store

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  Cisco 2500 Series Router, Model 2502
$18 at CablesAndKits.com Overall Rating: 9.1
$17.95

Found at 1 store

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  Cisco AS5300 48 Port Access Server / Router, AS53-4T1-48-AC
$595 at CablesAndKits.com Overall Rating: 9.1
$595.00

Found at 1 store

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 Perle ISDN terminal adapter Modems Perle ISDN terminal adapter Modems
ISDN terminal adapter - plug-in module - expansion slot - ISDN BRI U

$429.99

Found at 1 store

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