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• DS0 logic level transmit and receive data access
through faceplate bantam jacks.
• Faceplate LEDs indicate operational and test status.
Additional features to the L4 include:
• Provides repeater power of 43 mA at -28 to -120 VDC.
Each list of the DE-4 U-BR1TE has two interfaces. The
loop-side interface is an ISDN U-interface that transmits
and receives data simultaneous. Full-duplex over a
standard 2-wire and unloaded loop for a distance up to
18 kft of mixed gauge wire. Either DE-4 U-BR1TE list
can be configured to connect to an ISDN switch,
(Adjacent-to-Switch), the customer NT1 (Adjacent-to-
Customer), another U-BR1TE (Tandem Office Mode),
or Adjacent to an ADTRAN U-RPM/U-repeater. See
Figure 2 for circuit location description. The carrier side
interface provides mapping of up to 2B+D and DSL
overhead to three DS0s of the 1.544 Mbps T1 stream.
Indicators for the loop and carrier synchronization status
are located on the faceplate. See Table A for a description
of each indicator. Connection to the U-interface is made
to Tip/Ring of the physical shelf slot position of the
U-BR1TE.
Northern
D3/D4/D4E
COT
2-wire
L
U
N
T
Adjacent to Switch
1 OFF
SW2
2 OFF
Northern
COT
2-wire
L
ISDN
U
Switch
N
T
Adjacent to Switch
1 OFF
SW2
2 OFF
Northern
D3/D4/D4E
COT
2-wire
L
U
N
T
Adjacent to Switch
1 OFF
SW2
2 OFF
2
Northern
D3/D4/D4E
RT
T Carrier
L
U
L
T
Adjacent to Customer
1 OFF
SW2
2 ON
Northern
RT
L
T Carrier
U
L
T
Tandem Office (Source)
1 ON
SW2
2 ON
Northern
D3/D4/D4E
RT
L
T Carrier
U
L
T
Adjacent to U-Repeater
1 ON
SW2
2 ON
Figure 2. Position Switch Settings at Network Locations
Section 61410020L2-5, Issue 3
2. INSTALLATION
After unpacking the unit, immediately inspect it for
possible shipping damage. If damage is discovered, file
a claim immediately with the carrier, then contact
ADTRAN Customer Service ( See Warranty and
Customer Service ).
The DE-4 U-BR1TE plugs into a single shelf slot position
of an DE-3/4/4E or DE-4E SMART channel bank and
requires no special wiring. Connection to the U-interface
is made to Tip/Ring (T/R) of the physical shelf slot
position when the U-BR1TE is installed. The type of the
service selected can affect the adjacent shelf slots.
When configured for 2B+D mode of operation, which is
the most typical application, three timeslots are required.
The timeslots used are the first slot position the DE-4
U-BR1TE is installed in, and the next two adjacent shelf
slot position, which must be empty. In the 2B+D mode
of operation, the DE-4 U-BR1TE cannot be located in
J23 or J24. In 1B+D or 2B modes of operation, only one
adjacent shelf slot position is required, therefore, J24
cannot be used. In 1B and D modes of operation, only
the physical time slot of the shelf slot position is required,
and there are no restrictions.
2-wire
Loop
Customer
NT1
Northern
D3/D4/D4E
COT
2-wire
L
T Carrier
U
N
T
Tandem Office (Sink)
1 ON
SW2
2 OFF
2-wire
U-RPM
RP
U-Repeater
Northern
D3/D4/D4E
2-wire
RT
L
Loop
U
L
T
Adjacent to Customer
1 OFF
SW2
2 ON
2-wire
Loop
Customer
NT1
61410020L2-5C
Customer
NT1
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