8
61291004L2-5, Issue 2
61291004L2-5B
Remote access is accomplished using a defined set of
in-band DS0 byte sequences similar to the latching
loopback sequence. Commands issued through the
test system are recognized by the individual channel
unit, which responds with the appropriate byte
sequences. These in-band commands may be used to
verify options via dialogs with REACT 2001 and TPI
108/109 test sets. Unit CLEI, serial number,
provisioning, and performance information can be
retrieved remotely using the Digital System 6
protocol.
Provisioning and Status
All configuration options can be remotely viewed or
provisioned. The front panel Remote (REM) LED
indicator
flashes
during control link establishment and
remains ON after the channel unit has been remotely
provisioned.
If the channel unit has been remotely provisioned, the
operator can alternate remote configuration and
manual switch settings by pressing the momentary
Alternate Provisioning (AP) switch located on the
front panel. If the channel unit is removed from the
system, the unit retains previous provisioning
information in nonvolatile RAM.
The REM indicator remains ON when the channel unit
is operating based on Remote Provisioning, and is
OFF when operating on manual switches. If the
channel unit has never been remotely provisioned, the
AP switch has no effect and the REM indicator
remains OFF. See Table 1 for LED indicators.
Out-of-Band Diagnostics
In addition to in-band access to TRDDB performance
diagnostics and provisioning via Digital System 6,
access is also available out-of-band (non-intrusively)
via the craft interface located on the TROCU-R. The
TROCU-R displays provisioning information, Total
Reach system status, performance monitoring
information stored in 15 minute and 24 hour registers
for both the TRDDB and TROCU-R, and an event log
which time stamps system performance anomalies and
threshold violations. Physical access to the terminal
interface on the TROCU-R is made by a serial
interface connection to a dumb terminal or dumb
terminal emulation. Provisioning of the TRDDB can
be viewed and changed from the terminal interface on
the TROCU-R. Further information about the
TROCU-R terminal interface and performance
monitoring is found in the TROCU-R practice,
P/N 61291023L3-5A.
5. DEPLOYMENT GUIDELINES
The TRDDB and TROCU-R use technology intended
to eliminate the need for repeaters and concerns over
impairments caused by typical noise and bridged taps.
Listed below are the loop design guidelines for Total
Reach DDS (see Table 3
and
Table 7
for more
information):
• All loops must be nonloaded.
• Actual Measured Loss (AML) should not exceed
50 dB at 13.3 kHz (135
Ω
termination), the
Nyquist frequency of Total Reach DDS.
NOTE
The 50 dB AML limit includes 6 dB of signal
margin to account for potential near-end cross
talk (NEXT) from other digital services that
may be provisioned in the same binder group.
Loop length should not exceed 50 kft.
• Bridged tap length should not exceed 12 kft.
• Background noise level should not exceed 34
dBrn.
• Impulse noise should not exceed -40 dBm,
(+50 dBrn).
NOTE
Measure noise with 50 kbit weighting
characteristic approximating a filter with a
passband of 40 Hz to 30 kHz. Background noise
level or impulse noise level is referenced from
56/64 kbps data rate in TR62310.
Table 7. Total Reach DDS Insertion Loss
Measurements
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9
5
Содержание Total Reach TRDDB
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