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.

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.

If the D630 is turned on but is not connected, it will go into a “low power” mode and will eventually shut itself off, in order to conserve battery life. When the 630 is connected to a network, then it will stay on and continue testing indefinitely until it is manually switched off or until it is disconnected.