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ISDN Interfaces
ISDN Testing and Troubleshooting
Strata CTX I&M 06/04 7-33
ISDN Interfaces
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 Figure 7-29).
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 7-29 Strata CTX TTY Port BRI Connection to PC
4. Press the Enter key on the PC keyboard. The Strata CTX responds with CODE.
Note Make all entries from the PC keyboard in Capital letters.
5. At the CODE prompt, type the Strata CTX, four-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.
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:
## BUU LOOP BACK TEST ##
SLOT=ss CIRCUIT=m B1:OK B2:OK D:OK
5866
Strata System
RBUU
(LT Mode)
PC with Hyper
Terminal
Software
U-Terminal
device
(loop back)
1-pair BRI Circuit Line Cord
3-pair Telephone Cord
RSIU or PIOU
TTY Port TTY Port
Test data from Strata sent to
Terminal. If 80% of sent data is
returned test passes.