Configuration/Port/ PME Port Profile Help

A PME (Physical Medium Entities) profile is available for each G.SHDSL port and are used to set link rates.

To view the most current information, click the Refresh button.

To provision a port, click the Provision button.

Select the type of port from the Slot drop-down menu.

PME Port Profile

Port

Port number

2B Region

Regions are set as specified in the relevant Regional Annex of [G.991.2]. Regional settings place limitation on the maximum allowed data rate, power, and constellation. The possible values for this parameter are:

Region 1: Annex A and F (North America)

Region 2: Annex B and G (Europe)

You can only change regions when the link is down.

2B Data Rate(kB/s)

The line type for an G.SHDSL interface is set at shdsl-2btl which can perform automatic baud rate adaption. This allows receiving devices to communicate with transmitting devices operating at different baud rates without the need to establish data rates in advance. By determining the baud rate from the transmitting device, the receiving system automatically trains to match the line rate of the incoming data.

The automatic baud rate adaption process may take several minutes. This is because the system (CO) and CPE devices use an algorithm to step through a sequence of baud rates, where the devices establish a connection at each line rate and then move to the next higher rate until they reach the final rate they agree upon.

Setting 2B Data Rate to 0 sets the data rate to adaptive. Entering a value defines a specific data rate in kbps. If you specify a data rate, and the requested data rate cannot be achieved due to line conditions, the line will not get link.

If you specify a data rate, it must correspond to a supported data rate in the 2B Constellation setting.

The actual data rata achieved depends on the data rate settings for both the CO and CPE devices.

CO data rate = 0 and CPE data rate = 0, then Data rate = Highest available rate is negotiated.

CO data rate = 0 and CPE data rate = non-zero, then Data rate = CPE setting is the highest possible rate.

CO data rate = non-zero and CPE data rate = 0, then Data rate = CO setting is the highest possible rate.

CO data rate = non-zero and CPE data rate = non-zero (in this case, both the CO and CPE settings are the same), then Data rate = CPE and CO setting is the highest possible rate.

CO data rate = non-zero and CPE data rate = non-zero (in this case, the CO and CPE settings are diffferent), then Data rate = the lesser of the CPE and CO settings is the highest possible rate.

2B Constellation

TCPAM configurations have a minimum and a maximum data rate range, depending on the constellation setting. If a data rate is set outside of the correct range of the constellation setting, an error message will return.

Configuring TCPAM is necessary only on the CO side. However, the CPE must be capable of extended rates in order for the line to successfully train/link.

TCPAM settings are typically used as follows:

TCPAM4 and TCPAM8 are useful for operations over longer and/or noisier loops, but use reduced data rates.

TCPAM64 is useful on short loops using CAT5 wiring for in-building and campus applications. In these cases, CAT3 loops would be too noisy for the SNR requirements.

TCPAM128. Support for TCPAM128 constellation is not yet officially available. Achieving stable and reliable connections using TCPAM128 constellation typically requires Cat 5 rated cable plant and otherwise ideal conditions - environments that are typical not available in real-world, outside and inside plant environments. Much more stable, and higher data rate connections can tipsily be achieved by limiting the applications to TCPAM32/64 constellations.

Values:

TCPAM4: data rate 192 to 2048. You must set a data rate in the 2B Data Rate setting.

TCPAM8: data rate 192 to 5056. You must set a data rate in the 2B Data Rate setting.

TCPAM16: data rate 192 to 7616 or an adaptive rate of 0 with a max train rate of 5696

TCPAM32: data rate 768 to 10176 or an adaptive rate of 0 with a max train rate of 5696

TCPAM64: data rate 768 to 12736. You must set a data rate in the 2B Data Rate setting.

TCPAM128: data rate 768 to 14912.

Adaptive: 0 or 192 to 5696

Network Time & Power

Reference clock setting.

Values:

ntr-refck-8khz: use Backplane 8KHZ clock for timing

ntr-local-osc: local clock

March 24, 2012