Csu Dsu
Csu Dsu
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| Cisco PA MC 8T1 8 Port Multichannel T1 Port Adapter with Integrated CSU DSU | |
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| CISCO WIC 1DSU T1 1 Port T1 Fractional T1 DSU CSU | |
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| CISCO WIC 1DSU T1 V2 1 Port T1 Fractional T1 DSU CSU | |
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| Cisco WIC 1DSU T1 V2 T1 DSU CSU WAN w Hologram | |
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| NEW SEALED CISCO HWIC 1DSU T1 1 Port T1 Fractional T1 DSU CSU | |
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| CISCO 2425 ROUTER DSU CSU+ISDN BRI NT1+SYNCHRO SER WAN | |
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| Digital Link Ensemble Encore SNMP DSU CSU Shelf DL2001 Chassis + DL2120 | |
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| LOT of 2 Digital Link Prelude Encore T1 DSU CSU DL080 100 01900 02 | |
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| Motorola 3500 DSU CSU Codex 56k Modem PC48900 | |
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| ADC Kentrox T SERV II CSU DSU 01 77965023 211090948 | |
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| Netopia D7100C Router SDSl CSU DSU 8 Port | |
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| INC CM 756 CM 756 All Rate CSU DSU | |
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| Cisco HWIC 1DSU T1 1 Port T1 DSU CSU WAN Card | |
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| ADC Kentrox DSU CSU T Serv IIT1 XR FA 77966 | |
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| NIMT3E301 Enterasys DSU CSU plug in module fractional T 3 E 3 | |
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| UNUSED CISCO WIC 1DSU T1 V2 1 Port T1 CSU DSU WAN Card V2 Genuine Hologram | |
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| Cisco T1 DSU CSU WAN Interface Card WIC 1DSU T1 V2 | |
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| Cisco 73 1645 01 FT1 T1 DSU CSU LOT OF 4 | |
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Need to set up Cisco 1721 on Bridge mode (passthrough Mode)?
We are switching from a Frame connection to a regular T1 line with a different company but it has a VPN device in between and would like to use my 1721 since it has a CSU/DSU conection. What are the settings for the Cisco Router to passthrough to my VPN device, so I can still use the DHCP, and all the other settings from my servers?
Is the VPN device sitting between your Cisco 1721's CSU/DSU and the T1 line, or is the VPN device attached to an ethernet port on the 1721? If the VPN device attaches to an ethernet port on the 1721, does your network connect behind the VPN device, or on another ethernet port on the 1721?
All I can offer for now is the appropriate Cisco documentation for transparent bridging for your particular version of IOS (link below for 12.1). Use the examples for basic bridging to start. I'm assuming the VPN device sits between the 1721 and the T1 line, and you are wanting to pass the normal DHCP traffic from the vendor (via the VPN device) to some other devices beyond your 1721.
How A T1 Line Works
When trying to convince your boss that your company needs T1 bandwidth to help solve a network issue and meet business function requirements …. it comes in handy to know just how a T1 line works. Without that understanding you're more likely to lose the argument and remain stuck with whatever dinosaur set-up you're trying to move away from. As your company's go-to IT person … you can't afford to lose those battles.
You already know that there are many flavors of T1. But you need not go into that with your boss. If necessary you can adequately describe in simple terms the difference between fractional, full, and bonded … as well as the general aspects of point-to-point and MPLS architecture. For the purposes of making your main point … just stick with describing the basic single point-to-point T1 line..
For a generic point-to-point T1 circuit, part by part, generically speaking it works like this from the premises back.
Your router CSU/DSU DS1 signal connects to a SmartJack aka a Highcap Remote Unit (HRU) mounted in the Network Customer Terminating Equipment (NCTE) also known as the mounting which converts the DS1 signal to a T1 for transport.
From there it is connected by either a single pair or two depending on the technology utilized to the central office repeater shelf where a Highcap Line Unit (HLU) is installed which converts the T1 signal back to a DS1 and also provides 186 or 130 volts over the copper pair(s) to power the HRU.
From the CO repeater shelf the DS1 signal along with 27 others are passed to a Digital Access Crossconnect System (DACS) or muxed up to a DS3 and then to the DACS which provides mapping of the DS1 signals and remote testing capabilities.
Out of the DACS the signal is most commonly a DS3 or higher and passed to another MUX along with other DS3's for conversion to an OCx for interoffice transport.
At the other end the process is reversed.
As far as a T1 switching device at the provider end … depending on the type of circuit, there are fast packet switches, frame relay switches and routers.
Now your boss may turn glassy eyed halfway through your technical diatribe above …. but that's alright. You have shown a thorough knowledge of the workings behind what you want … a T1 line based network. That should be enough to impress upon him or her that you know what you're talking about from the technical side. From there … all you need to do is address the cost benefit. For that simply show the impact of your current poor performing network on the core functions of the business …. compared to the improvement(s) gained with the network architecture you're recommending.
About the Author
Michael is the owner of FreedomFire Communications .... and also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.
For quality Dedicated Bandwidth service, protect yourself and your investment by comparing amongst 30 first and top tier carriers where you have a Low Price Guarantee. For more information about Dedicated Bandwidth and finding your best deals and options, please visit DS3 Bandwidth Solution.
Home Server Room Part 1
