Speedstream 4200

A modem with speeds up to 24Mbps downstream and 1.5Mbps upstream in broadband service, Siemens SpeedStream 4200 USB / Ethernet modem provides a cost-effective, full-featured DSL solution for subscribers and is compatible with any Ethernet equipped PC. Featuring the configurable ICSA-compliant Stateful Inspection Firewall, this modem offers flexibility of connecting with convenient Ethernet using plug-and-play USB, maximizing deployment options and subscriber value. This device is for DSL Broadband Internet Service.

This is a DMT DSL modem and router. CAP was the original technology used for DSL deployments, but the most widely used method now is DMT.

Router Support: Statistics

Login to the speadstream web interface. Click on Status and Statistics from the left menu.

DSL Statistics:

SN Margin (AKA Signal to Noise Margin or Signal to Noise Ratio)

Relative strength of the DSL signal to Noise ratio. 6dB is generally the lowest dB manufactures specify in order for the modem to be able to synch. In some instances interleaving can help raise the noise margin to an acceptable level. Generally speaking, as overall bandwidth increases, your signal to noise ratio decreases. So a customer that upgrades from 1.5 to 6.0 service will typically see a corresponding decrease in the signal to noise ratio. 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. One of the biggest factors affecting line attenuation is distance from the DSLAM. Generally speaking, bigger distances mean higher attenuation. 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

Support

One or more of the requested ports is already allocated for system use.

Trying to forward a port to a LAN IP address, the router complains "One or more of the requested ports is already allocated for system use."

This error may occur if you are trying to forward a port, and the system will not let you. In the list of ports already being forwarded the port you specified is not present. An example is when trying to forward port 55641 (bittorrent) this error may appear. It is due to the speedstream firewall having a rule that is currently blocking the port. In our lab a Speedstream 5200 with Firewall level set to "Medium" would not allow port forwarding of 55641. To resolve, set the firewall level to "Off", reboot the router, and you should be able to forward the port. Another possible cause of this conflict is having uPnP enabled. Disable uPnP.