Isdn Testing And Troubleshooting; Bri-U, Lt Interface Terminal Loop Back Test - Toshiba STRATA CTX100 Installation And Maintenance Manual

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ISDN Testing and Troubleshooting

ISDN Testing and Troubleshooting

BRI-U, LT Interface Terminal Loop Back Test

The Strata CTX provides a built-in loop back test to check the U-type, lSDN terminal connected to
the RBUU or RBUS circuit. The Strata CTX performs the 2B+D loop test using the eoc ISDN,
layer 1 function. This tests the U-terminal and the wire connection from the Strata CTX to the BRI
device; it does not check the Strata CTX PCM highway or RBUU/RBUS functionality.
1. Connect the U-terminal device to the Strata CTX BRI, RJ45 circuit jack (see
2. Connect the Strata CTX TTY port (PIOU, RSIU, TSIU, etc.) to the COM port of a PC running
a communications application such as ProComm or Hyper Terminal, etc.
3. Setup the com-port parameters for 7-bits, even parity, 1-stop bit and the appropriate speed.
Figure 5-27 Strata CTX TTY Port BRI Connection to PC
4. Press the Enter key on the PC keyboard
The Strata CTX responds with CODE
5. At the CODE prompt, type the Strata CTX, 4-digit code from the PC keyboard
The Strata CTX responds with MODE
6. At the MODE prompt, type TEST and press Enter from the PC keyboard
The Strata CTX responds with T
Make all entries from the PC keyboard in Capital letters.
Note
7. At the T prompt, type LBUU ss m and press Enter from the PC keyboard
Where ss = BRI PCB slot number and m=BRI circuit number (1-4).
Notes
The U-terminal must be idle, and remain idle, during the loop back test.
●
The Strata CTX sends 4 octets of data to the U-terminal during the loop back test: 0X00,
●
0XFF, 0XB2, and 0X4D. These octets are sent to the B1, B2, and D channels 50 times. If the
Strata CTX receives 80% of the sent data back, it assumes the test to pass. (i.e., the U-terminal
and wiring is good.)
If The Strata CTX responds with:
5-30
Strata System
Test data from Strata sent to
Terminal. If 80% of sent data is
returned test passes.
RBUU
(LT Mode)
1-pair BRI Circuit Line Cord
RSIU or PIOU
3-pair Telephone Cord
TTY Port
5866
U-Terminal
device
(loop back)
PC with Hyper
TTY Port Terminal
Software
Figure 5-23).
Strata CTX I&M 10/02