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Section 61102040L4-5, Issue 2 61102040L4-5B
2
• Loopback release in response to TIPs generated
from the network direction per TR62310.
• Remap all subsequent DS0 DP loopback codes
into respective eoc loopbacks to loopback
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.
• Transmit “Mux out of Sync” (MOS) upstream in
B1 during DSL loop open, loss of signal, or loss
of sync condition.
• Returns Abnormal Station Code (ASC) to the
network in B1 during loopback conditions
initiated by the IDSL OCU-R.
Common Features:
• ISDN 2B+D interface which meets all Layer 1
requirements as specified in ANSI T1.601-1992.
• 18 kft nominal range on mixed gauge wire (42
dB @ 40 kHz loop loss, 1300 Ω DC resistance
design).
• All Layer 1 maintenance functions.
• Performance monitoring of the Layer 1 facility as
specified in TR-NWT-000397.
• A distinctive metallic DC test signature to
identify either Line Unit Loop Termination
(LULT) or Line Unit Network Termination
(LUNT) mode of operation as specified in
TR-NWT-000397.
• DS0 logic level transmit and receive data access
through the front panel RJ-45 jack.
• Loop, carrier, and synchronization status
available at the front panel.
• Compatible with AT&T SLC-2000, SLC Mode 1.
• Compliant with TR-TSY-829, TR-TSY-1089,
FCC Part 15, Class A, and UL-1459.
ADTRAN has obtained the necessary licenses that
grant the right to develop a SLC-5 U-BR1TE III. The
ADTRAN U-BR1TE III replaces the AT&T AU92
(COT) and AU93 (RT) BR1TE channel units. The
U-BR1TE III (TR 397 compliant) will not function
with the AT&T BR1TE channel units across the T1
carrier facilities. The U-BR1TE III must be terminated
across the T1 carrier facilities with another channel
unit that meets TR 397.
transport of 2B+D information. Block error rate
performance over the T1 facility is monitored and is
available to the network.
The SLC-5 U-BR1TE III incorporates a feature that
allows for detection of ISDN capable and non-ISDN
capable SLC-5 Bank Controller Units (BCU). In
addition, the unit will facilitate communications to the
non-ISDN capable BCU for the time slots associated
with the adjacent physical slot, eliminating the need
for the NULL Channel Unit, P/N 1200102L1 in the
non-ISDN SLC-5 terminals. Earlier versions of the
SLC-5 BCU will not recognize an ISDN channel unit
ID, and will not assign the required time slots of the
next physical position for 2B+D operation. For
previous versions of the SLC-5 U-BR1TE, a NULL
Channel Unit, which communicates to the non-ISDN
capable BCU, is required to reserve the associated
time slots for 2B+D service.
By automatically determining the version and
requesting the necessary time slots for the non-ISDN
capable BCUs, the U-BR1TE III eliminates the
confusion regarding 2B+D deployment, and the
requirement of deploying the NULL Cards. The
U-BR1TE III will operate properly when a NULL
Card is installed in the adjacent physical slot, as in a
replacement situation.
Features
U-BR1TE III 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.
• Provides for the transport of ISDN Basic Rate
2B+D information over T1 facilities in the 3-DS0
format specified in TR-NWT-000397.
• NULL card not required with non-ISDN BCUs.
• B1 or B2 loopback addressability at the faceplate
for the NT1 and up to six devices in the
Network-to-Customer direction.
• Compatible with MLT 3.0/ISDN per
TR-NWT-000397, Issue 3, December 1993.
DDS Features:
• Span powers an IDSL OCU-R with 12 mA @ -120
Vdc for DDS applications.
• Perform bidirectional loopback (loop and
network) when commanded into DS0 DP
loopback from the network direction only.