Chapter 6 G.shdsl Commands; G.shdsl Standards; Profiles; Configured Versus Actual Speed - ZyXEL Communications ZyXEL DMA 1000 User Manual

The G.SHDSL (G.991.2 Single-pair High-speed Digital Subscriber Line) subsystem allows you to
6.1

G.SHDSL Standards

The IES-1000 supports both G.991.2 and the G.hs standards.
STANDARD
G.991.2
6.2

Profiles

A profile is a table that contains a list of pre-configured SHDSL settings. Each G.SHDSL port has one (and only
one) profile assigned to it at any given time. The profile defines the maximum and minimum transfer rates, of all
the G.SHDSL ports that have this profile. You can configure multiple profiles, including profiles for
troubleshooting.
Profiles allow you to configure G.SHDSL ports efficiently. You can configure all of the G.SHDSL ports with the
same profile by modifying the profile, thus removing the need to configure the G.SHDSL ports one-by-one. You
can also change an individual G.SHDSL port by assigning it a different profile.
For example, you could set up different profiles for different kinds of accounts (say economy, standard and
premium). Assign the appropriate profile to a G.SHDSL port and it takes care of a large part of the port's
configuration. You still get to individually enable or disable each port, as well as configure its encapsulation type,
multiplexing mode, VPI and VCI. See later in this chapter for how to configure profiles.
6.3

Configured Versus Actual Speed

You configure the maximum and minimum speed of individual G.SHDSL ports using the set profile
command. However, due to noise and other factors on the line, the actual speed may not reach the maximum that
you specify.
Even though you can specify arbitrary numbers in the set profile command, the actual speed is always a
multiple of 64 Kbps. If you enter a speed that is not a multiple of 64 Kbps, the actual speed will be the next lower
multiple of 64Kbps. For instance, if you specify 600 Kbps for a port, the actual speed for that port will not exceed
576 Kbps, and if you specify 660 Kbps, the actual speed will not be over 640Kbps.
Note that when you configure a G.SHDSL port, the upstream and downstream speeds are the same. The list
port command displays the configured parameters and actual speed of a G.SHDSL port.
G.SHDSL Commands
configure and monitor the G.SHDSL ports on the SAM1008 network module.

Table 6-1 Data Rates of the SAM1008's SHDSL Ports

MAXIMUM UPSTREAM AND
DOWNSTREAM RATE
2304 Kbps
G.SHDSL Commands
MINIMUM UPSTREAM AND
DOWNSTREAM RATE
192 Kbps
IES-1000 User's Guide
Chapter 6
6-1