2
Section 61104020L4-5, Issue 3
61104020L4-5C
C A U T I O N
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
• All Layer 1 maintenance function and performance
monitoring as specified in TR-NWT-000397 and
TR-TSY-000829.
• Distinctive metallic DC test signature to identify
either line unit LT or line unit NT mode of
operation as specified in TR-NWT-0000397.
• Provides loopback capability for full 2B+D as well
as individual B channels in both loop and carrier
directions. Individual B channel loopbacks may be
initiated at the U-BR1TE V front panel or from a
remote location through the maintenance channel.
• DS0 logic level transmit and receive data access
through front panel bantam jacks.
• A built-in Cyclic Redundancy Check (
crc
) clock
error detector allows for local performance
monitoring at the front panel without test equipment.
• Addressing and error status with front panel LED
indicators. Test function chosen by a front panel
ten-position rotary switch.
The U-BR1TE V is compatible in functionality and is
interchangeable with the U-BR1TE III w/PWR
(1103020L4) except when used in DDS applications.
In addition to being compatible and interchangeable
with the just mentioned ADTRAN unit, the U-BR1TE
V, adds features in leased mode, including DS0 DP
latching loopback and sending Multiplexer-Out-of
-Sync (MOS) toward the network.
2. INSTALLATION
After unpacking the unit, inspect it for damage. If
damage is noted, file a claim with the carrier, then
contact ADTRAN. See
Warranty and Customer
Service
.
Physical Requirements
The U-BR1TE V plugs into a single D4/SLC-96
channel slot. The backplane pin assignments are
illustrated in
Figure 2
. When provisioned for basic
rate service (2B+D), the U-BR1TE V occupies three
time slots. In a D4 or SLC-96 Mode III channel bank,
it occupies the time slot associated with the physical
channel slot that it occupies plus the next two time
slots to the right. The physical channel slots, whose
time slots are used in this manner, must remain
unoccupied.
Features
The U-BR1TE V features support both ISDN and
DDS, plus features common to both as listed here:
ISDN Features
• Span powers U-repeaters with 43 mA @ -28 to
-120 VDC for ISDN applications.
• Internal test pattern allows for testing of
individual B Channels without requiring external
test equipment.
• Transportation of ISDN Basic Rate 2B+D
information over T1 facilities in the 3-DS0
format specified in TR-NWT-000397.
• B1 and B2 loopback addressability at the front
panel for the NT1 and up to six devices in the
Network-to-Customer direction.
DDS Features
• Span powers an IDSL OCU-R with 12 mA @
-120 VDC for DDS applications.
• Transmit MUX-Out-of-Sync (MOS) trouble code
upstream for IDSL loss of signal, loss of sync, or
open loop.
• Perform bidirectional loopback (loop and
network) when commanded into DS0 DP
loopback from the network direction only.
• Initiate in-band OCU loopback to loop the IDSL
OCU-R via front panel push button.
• Loopback release in response to TIPs per
TR62310 or front panel push button.
• Remap all subsequent DS0 DP loopback codes into
respective EOC loopbacks to loop back respective
downstream U-Repeaters, TRISDN elements, and
U-BR1TES when optioned for 1B+D, or 2B+D.
• Pass OCU loopback code through to loop the
IDSL OCU-R.
• Pass CSU loopback code through to loop the
CSU/DSU and simultaneously send a remap to
the NT1 EOC address.
• Returns Abnormal Station Code (ASC) to the
network in B1 during loopback conditions
initiated by the IDSL OCU-R.
2B Leased Mode Features
• DDS loopback operation during 2B data mode
only.
Common Features
• ISDN 2B1Q interface which meets all Layer 1
requirements as specified in ANSI T1.601-1991.
• 18 kft nominal range on mixed gauge wire.
