• What do CO and RT mean ?
• Why is my line capped below the advertised speed?
• What kind of speed should I expect from my DSL line?
• What are the VPI/VCI #'s for SNET?
• How do I set up my Cayman for static IPs?
• 5100B and 4100 Modem Statistics - What do these mean?
• What are the distance requirements for Elite Service and what speeds will I get?

Central Office (CO):  It is the physical building where the local telephone switching equipment is located.  All telephone lines in a town lead to the CO.

Remote Terminal (RT): An RT is a piece of switching/routing equipment that leads back to the CO. They are generally connected by a fiber optic line, but older RT’s used T1 lines to connect back to the CO. It's a method of virtually extending the CO equipment out into areas beyond the servicable radius of the CO dslams.

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by Thin1 edited by MrFixitCT
last modified: 2002-04-06 07:31:08

A line is only capped to eliminate instability and avoid loss of sync and connection. If the line is incapable of supporting top speed due to distance or line quality issues, the cap, while reducing speed incrementally, will provide for a more stable connection. The only available levels are 1536kbps, 768kbps and 384kbps. To avoid any rumors regarding this being done by the corporation to save money, bandwidth, or deprive the customer of the speed they are paying for, the capping process has no impact on overall bandwidth at the local level so there is no corporate advantage in capping a customer...

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by Kevin

Approximately 75-80% of advertised speed is doing great.

The advertised speed is for the entire transmission. This transmission also includes the protocol information. In the case of SNET they use PPPoE and TCP/IP. Each one of these protocols takes a small chunk of your bandwith. This is why you might only be getting 1200kbps on a 1500kbps line.

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by Thin1 edited by meskinct
last modified: 2005-02-04 09:00:30

VPI: 0
VCI: 35
It is the default for many routers.

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by gameboyrom edited by Kevin

/forum/remark,5060919~root=cayman~mode=flat#5061890

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by MrFixitCT

SN Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)
Relative strength of the DSL signal to Noise ratio. 6dB is the lowest dB manufactures specify for modem to be able to synch. In some instances interleaving can help raise the noise margin to an acceptable level. The higher the number the better for this measurement.
6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with no synch problems
20dB-28dB is excellent
29dB or above is outstanding

Line Attenuation
Measure of how much the signal has degraded between the DSLAM and the modem. Maximum signal loss recommendation is usually about 60dB. The lower the dB the better for this measurement.
20dB and below is outstanding
20dB-30dB is excellent
30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues

CRC Errors (Cyclic Redundancy Check)
CRC is a method of detecting errors in data transmission. A high CRC count in inself is not really cause for alarm. However, any increase in CRCs after your initial connection is established is a problem and usually points to a physical issue somewhere.

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by meskinct edited by MrFixitCT
last modified: 2008-12-06 22:27:25

To the best of our knowledge the distance requirements for Elite are 8000 feet for Remote Terminals(RT) and 6000 feet for Central Office (CO). You should expect speeds of 5200dn/620up with this package.

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by meskinct