Features
The D630 T-Spanner was created to greatly simplify the work of Telco installers
and ISPs, as well as corporate network and telecom administrators who support
T1 circuits. The 630 is affordable, easy-to-use, and its unique set of features
makes it a valuable addition to everyone’s telecom tool kit.
The D630 emulates a CSU and supports connectivity and configuration testing to
the telephone network. With the touch of a single button, the 630 will show the
user if a T1 carrier is present, display the signal strength, identify the framing and
line coding if present, and detect whether payload data is present. Finally, the
unit will indicate standard network alarm conditions, and when framing is present,
display cumulative counts of line code and path code violations. The 630 also
responds to loop-up and loop-down requests from the Telco.
Operation
All of the T-Spanner’s functions are automatic. Simply press the ON/OFF button
on the front panel to activate the 630 and begin testing. If you see a BATTERY IS
LOW message at any time, then simply replace the 9-volt battery in the rear of
the housing.
You should be connecting to the telephone network using a “straight through”
cable, but you can also use the 630 to verify the operation of a CSU/DSU by using
a “crossover” cable. The 630 will let you know if your cable appears to be
properly connected to a T1 port, as well as warn you if the connection appears to
be open or shorted.
Once connected, the T-Spanner begins by looking for the T1 carrier, which is
based on a 1.544 MHz clock source. Next, assuming no alarm conditions are
present, it will display the received signal strength and proceed to identify the
framing and the line coding. Then, the display will show you the elapsed time
since the connection was made, along with error counts for any line code or path
code violations.
When connected to the telco network, you will normally see the following two
screens, in an alternating fashion. Obviously, the framing, line coding, signal
strength, error count and elapsed time will vary depending on your application.
ESF & B8ZS
-2.5 to -5 dB
TIME LCV PCV
013:07 0000 0000
