Strata Ctx Isdn Reference Model - Toshiba STRATA CTX100 Installation And Maintenance Manual

ISDN Interfaces
BRI U Overview
A subassembly (RBUS) can be attached to the RBUU for two additional BRIs for PSTN and/or
U-type station connections. The RBUU PCB and the RBUS subassemblies are shown in
Figures 5-21
one slot to provide up to four U-type BRI circuits.
Notes
Each installed RBUU or RBUS circuit provides a 2B + D connection and uses a system
●
capacity of two station ports and two CO lines regardless of the circuit application, even if the
circuit is not actually connected.

Strata CTX ISDN Reference Model

A block diagram of the Strata CTX ISDN PCBs and reference points is provided in
SLT
DKT
TE-1-S
(Voice or Data)
SLT
PC
TE-1-U
(Voice or Data)
R
SLT
PC
5432
Figure 5-1
5-2
and Figure 5-22 on page
CTX (NT2)
R
RSTU
RBUU/RBUS
PDKU
S
RBSU/RBSS
(NTs
R
(P-MP)
TA-S
U
RBUU/RBUS
(LT)
(P-P)
TA-U
R, T, S, and U are ISDN standard reference points
TE-1 = Terminal Equipment, Type 1
TA = Terminal Adapter
Customer Premises Equipment
ISDN Reference Model
5-25. The combination of RBUU and RBUS uses only
Demarcation Point
U
RJ48C
8-wire
T
RJ48C
NT1
RBSU
8-wire
RJ48C
CSU
RPTU (TE)
(NT1) 8-wire
Dealer-
Telco-
supplied
supplied
CSU and NT1
Jacks
P-P = Point-to-Point
P-MP = Point-to Multipoint
(passive bus)
BRI
Loop
Termination
ISDN
Loop
BRI
SWITCH
Termination
PRI
Office
Channel
Unit
Office Channel Unit, or OCR, is
the CO Channel Service Unit
Public Switched Telephone Network
(PSTN)
Strata CTX I&M
Figure 5-1.
10/02