ISDN Interfaces
BRI U Overview
5-2
Strata CTX I&M 10/02
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
and
Figure 5-22 on page 5-25
. The combination of RBUU and RBUS uses only
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
Figure 5-1
.
Figure 5-1
ISDN Reference Model
CTX (NT2)
R
S
U
T
U
ISDN
SWITCH
Demarcation Point
R
SLT
DKT
TE-1-S
(Voice or Data)
SLT
TA-S
TE-1-U
(Voice or Data)
RSTU
PDKU
RBSU/RBSS
(NTs
(P-MP)
RBUU/RBUS
RBSU
RPTU (TE)
RBUU/RBUS
(LT)
(P-P)
NT1
CSU
(NT1)
RJ48C
8-wire
RJ48C
8-wire
RJ48C
8-wire
Loop
Termination
Loop
Termination
Office
Channel
Unit
BRI
BRI
PRI
Office Channel Unit, or OCR, is
the CO Channel Service Unit
Dealer-
supplied
CSU and NT1
Telco-
supplied
Jacks
R, T, S, and U are ISDN standard reference points
Customer Premises Equipment
Public Switched Telephone Network
(PSTN)
5432
PC
R
SLT
TA-U
PC
P-P = Point-to-Point
P-MP = Point-to Multipoint
(passive bus)
TE-1 = Terminal Equipment, Type 1
TA = Terminal Adapter
Summary of Contents for Strata CTX100
Page 16: ...Introduction Related Documents Media xii Strata CTX I M 10 02 ...
Page 94: ...Strata CTX100 Installation Installing the CTX100 Cabinet 2 24 Strata CTX I M 10 02 ...
Page 150: ...Strata CTX670 Installation Remote Expansion Cabinet Unit 3 56 Strata CTX I M 10 02 ...
Page 188: ...PCB Installation Network Requirements 4 38 Strata CTX I M 10 02 ...
Page 238: ...T1 Loop Back Testing 6 12 Strata CTX I M 10 02 ...
Page 310: ...Station Apparatus 2000 series Telephones 8 48 Strata CTX I M 10 02 ...
Page 342: ...Peripheral Installation Station Message Detail Recording SMDR 9 32 Strata CTX I M 10 02 ...