Toshiba CTX28 manual RBUU/RBUS Wiring Guidelines, Line-side cabling, RJ45 Jack

ISDN Interfaces

RBUU/RBUS Interface Unit

RBUU/RBUS Wiring Guidelines

•Strata CTX BRI-U interface circuits can be configured to connect to an ISDN line circuit (NT mode, line-side) or to ISDN U-type terminal equipment TE1 or terminal adapters TA (LT mode, station side).

•Install the Toshiba-supplied Ferrite core on each ISDN circuit card per Figure 7-16on page 7-23. The Ferrite core is not supplied with the ISDN circuit cards must be ordered separately.

•For more information regarding the Strata CTX BRI-U interface, see “PRI and BRI Overview” at the beginning of this chapter.

Line-side cabling

•The ISDN BRI U-interface circuits are two-wire on the PSTN line-side.

•The wiring from the demarc to the Strata CTX BRI circuit should be made with CAT3~CAT5 twisted pair wire.

•The pinout of the Strata CTX BRI-U circuit jack is shown below.

8

7

6

5

4

3

2

1

NT and LT Mode

NC

NC

NC

Tip

BRI Pair

Ring

NC

NC

NC

NC = No Connection

4732

RJ45 Jack

Figure 7-26 Strata CTX BRI-U RJ45 Circuit Jack Printout

•The maximum distance between the PSTN BRI interface circuit and the Strata CTX ISDN BRI U line-side circuit (NT) is 18 kft. The Telco with the use of a repeater or fiber optic cable may extend this distance.

•The U interface pair should go directly from the demarc jack to the Strata CTX interface PCB with no bridge taps to different locations or should not have loading coils installed.

•BRI line-side cables should not be shielded.

•Each line-side BRI circuit requires a ferrite core as shown in Figure 7-16 on page 7-23.

•In the USA, most BRI-U Demarc jacks are RJ11, but they may be RJ45 eight-wire jacks. In Canada the BRI-U Demarc jack is usually RJ45.

•Polarity of the U interface pair is not critical.

7-30 Strata CTX I&M 06/04