Isdn Testing And Troubleshooting; Bri-U, Lt Interface Terminal Loop Back Test - Toshiba STRATA DK14 Installation And Maintenance Manual

ISDN Interfaces

ISDN Testing and Troubleshooting

Notes
PS2 and PS3 are not used with the DK BRI-U interface PCBs.
G
Check with the BRI circuit supplier to determine the pin out of the demarc jacks because some
G
jacks may be wired with two or three BRI-U line circuits each jack.
Station-Side cabling
o The ISDN BRI U-interface circuits are two-wire on the DK station-side.
o The maximum distance between the DK ISDN BRI-U, station-side circuit (LT) and the U-type
Terminal Equipment or Terminal Adapter is 18kft.
o The house wiring from the DK BRI circuit to the wall jack should be made with CAT3~ CAT5
twisted pair wire.
o Each station-side BRI circuit requires a ferrite core as shown in
o The flat satin telephone cord that connects from the wall jacks to ISDN terminal equipment
should be no longer than 33 feet.
o BRI station-side cables should not be shielded.
o Polarity of the U interface pair is not critical.
o The U interface pair should go directly from the DK interface PCB to the U-type TE1 or TA
with no bridge taps or loading coils to different locations.
o The pin-out of the TBUU and RBUU/RBSU BRI jack is shown in
Call Monitor Jack Cabling
The pin-out for the BRI-U interface call monitor jack is provided in
ISDN Testing and Troubleshooting

BRI-U, LT Interface Terminal Loop Back Test

The DK provides a built-in loop back test to check the U-type, lSDN terminal connected to the
RBUU, RBUS, or TBUU circuit. The DK performs the 2B+D loop test using the eoc ISDN, layer
1 function. This tests the U-terminal and the wire connection from the DK to the BRI device; it
does not check the DK PCM highway or RBUU/RBUS/TBUU functionality.
1. Set DK BRI programs to enable the BRI circuit to function. Make sure to setup the BRI circuit
in the station-side, LT mode using Program *60.
2. Connect the U-terminal device to the DK BRI, RJ45 circuit jack. (see
3. Connect the DK TTY port (PIOU, RSIU, TSIU, etc.) to the COM port of a PC running a
communications application such as ProComm or Hyper Terminal, etc.
16-36
Figures 16-15 and 16-16.
Figure 16-26:
Figure 16-33 of this chapter.
Figure 16-26).
Strata DK I&M 6/00