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Chapter 1 Getting Started
About G.SHDSL testing
2HST-3000 G.SHDSL Testing User’s Guide
About G.SHDSL testing
The HST-3000’s optional G.SHDSL testing feature enables
users to emulate an STU-R, STU-C, and Ethernet terminal
equipment (TE) to turn up and troubleshoot G.SHDSL circuits,
and the service over the circuit. Using the optional IP suite or
optional on-board web browser, the HST-3000 can also vali-
date a data connection over the network.
The capabilities of the G.SHDSL feature include the following:
– Both remote and central office (exchange) modem emula-
tion
– Ethernet TE emulation to verify service on the premises
LAN
– Various physical line and EOC standards
– User EOC messages
– Network layer and PPP emulation and authentication
– IP layer routing
– ATM loopback
– ATM F5 loopback
– ATM BERT capability
– IP ping
– Web browser
– “In-line” STU-R TE replacement “through” mode
– Supports 2-wire or 4-wire interface

Chapter 1 Getting Started
Quick tour
HST-3000 G.SHDSL Testing User’s Guide 3
Quick tour
The following section describes the status indicators and
connectors applicable to G.SHDSL.
Status LEDs These indicators report the status of the application. The func-
tion of each LED is described in Table 6.
Table 6 Status LEDs
LED Function
Sync A two-color LED that reports the status of
modem synchronization.
– Flashing green indicates that the modems
are training.
– Solid green indicates that the modems have
synchronized.
– Solid red indicates a synchronization error
has occurred.
Data A two-color LED that reports the status of the
data connection.
– Flashing green indicates that the data con-
nection is not yet established.
– Solid green indicates that a data connection
has been established with the network (so
that the HST-3000 may send and receive
data on the network).
– Solid red indicates that a data connection
error.
Error A two-color LED that reports modem errors.
– Solid red indicates an error condition.
Alarm A two-color LED that indicates alarm condi-
tions.
– Solid red indicates a local alarm condition.
– Solid amber indicates a remote alarm condi-
tion.

Chapter 1 Getting Started
Quick tour
4HST-3000 G.SHDSL Testing User’s Guide
Lpbk The loop back LED indicates a loopback con-
dition.
–Solid amber indicates that a local loop-
back has been achieved.
Batt Indicates the battery status.
– The Batt LED is off when the battery has a
useful charge.
– Solid green indicates the AC adapter is
plugged in.
– Solid red indicates the battery is approxi-
mately 20 percent or below of full charge.
– Flashing red indicates approximately five
minutes of use remains. When this happens,
the battery should be charged or replaced
immediately.
– Solid amber indicates the battery capacity
indicator (“gas gauge”) needs to be reset.
For information about replacing or charging the
battery, see the HST-3000 Base Unit User’s
Guide.
Table 6 Status LEDs (Continued)
LED Function

Chapter 1 Getting Started
Quick tour
HST-3000 G.SHDSL Testing User’s Guide 5
Connectors The connectors for G.SHDSL are located on the right side of
the SIM, as shown in Figure 1.
Use the 8-pin modular jack (G.SHDSL connector) for connec-
tion to G.SHDSL circuits. If you are using through mode,
connect an Ethernet cable to the Ethernet jack on the top
panel.
The connector uses pins 4 and 5 for 2-wire G.SHDSL and the
first pair of 4-wire G.SHDSL. The second pair for 4-wire uses
either 1 and 2 or 3 and 6.
Figure 1 G.SHDSL connector
SIM
base unit
G.SHDSL connector
WARNING: ELECTRICAL SHOCK
Electrical shock may result in serious injury or death. Use
care when connecting to telecommunications circuits, to be
sure that you do not come in contact with exposed conduc-
tors or power mains. Connect TNV signals to TNV ports
only.

Chapter 1 Getting Started
Quick tour
6HST-3000 G.SHDSL Testing User’s Guide
Sealing current
terminator
The sealing current terminator, HST3000-SC, is an optional
accessory available for DSL service. It is used when sealing
current or wetting current must be terminated. Typically this
occurs in an all-digital environment, but is not typical in DSL
since the equipment (NT1 or telephone) provides termination.
The LED on the module indicates presence of sealing current.
Place the module in-line, using the provided test cable.
The module is designed to terminate voltages under 80 volts,
anything over 80V may make the module act erratic (LED
flicker, go dim, etc.)
NOTE:
It is not recommended leaving the sealing current termina-
tor on the line in the presence of a repeater because the
module oscillates and could cause signal integrity issues
effecting HST test results.
CAUTION: DAMAGE TO MODULE
Placing the sealing current terminator on a line with voltage
over 150 volts may damage the unit.