Toshiba Strata CTX100, Installation And Maintenance Manual

Page: 215 / 348

ISDN Interfaces
RBUU/RBUS Interface Unit
Strata CTX I&M 10/02
5-27
ISDN Inte
rface
s
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 5-14 on
page 5-20 . 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.
Figure 5-24 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 5-14 on page 5-20 .
•
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.
RJ45 Jack
NT and LT Mode
4732
8
7
6
5
4
3
2
1
NC
NC
NC
Tip
Ring
NC
NC
NC
NC = No Connection
BRI Pair