Mitel Inter-Tel 5000, Installation And Maintenance Manual

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Chapter 4: Specifications
Single and Dual T1/E1/PRI Modules
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Page 4-27
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Zero code suppression scheme : The type of zero suppression scheme, AMI (bit-7
stuffing) or Bipolar Eight Zero Substitution (B8ZS), used by the T1 span connected to each
module.
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Line build-out (LBO) : The LBO attenuation of the T1 span connected to the module. This
value can be determined automatically by the system, or it can be set according to the T1
provider’s recommendation.
•
Loop Length : (Applies only to T1 and T1/PRI modules.) This is displayed with a red “X” if
the Haul Mode is set to Long Haul. It also provides optional loop lengths pertaining to a
Short Haul configuration.
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Haul Mode: This applies only for a T1 or T1/PRI configuration (E1/PRIs do not display this
field).
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Reference clock programming : All T1M, T1M-2, and BRM-S modules and the
motherboard must share the same clock signal so they can be synchronized with all the
digital trunk interfaces (T1/PRI/BRI) connected to the system. This synchronization is
accomplished by allowing one of the digital trunk interfaces to act as the system reference
clock. The programmer must designate whether the digital trunk interface is a private
network master, private network slave, or a public network slave. This clock-type
assignment generates a prioritized list, which forces the public network slave interfaces to
the top of the priority list. You can further prioritize which interface should be higher in the
list, among interfaces of the same type.
If more than one digital trunk interface is installed in the system, the software uses the
Reference Clock list to determine a back up to the system reference clock. Then, if the
module acting as the system reference clock fails or is taken out of service, the next
module on the back-up priority list becomes the reference clock.
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Error diagnostics : If desired, the programmer can generate the current T1 or T1/PRI
error counts, by hour and by day, for the selected T1 port. The error counts are displayed
in tabular format.
•
Error thresholds : The programmer can set numerical thresholds for certain T1 port errors
in terms of the number of errors per hour and number of errors per day. When a threshold
is exceeded, an error message is printed on the SMDR record.
The information that is programmed specific to each circuit (i.e., to each of the 24 channels) on
the T1 module includes:
•
Circuit type : Each individual circuit can be programmed as a loop start, ground start, DID,
E&M, or OPX circuit.
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DTMF or dial-pulse signaling : When the system is in the default configuration, all trunk
circuits are configured for DTMF signaling. If necessary, some or all of the circuits can be
reprogrammed for dial-pulse signaling.
T1 circuits are assigned hardware address numbers according to the module’s bay in the
chassis and the location of the circuit on the module. For example, T1 circuit 3.1.21 is the 21st
circuit on the T1M or T1M-2 module installed in Bay 3 of the chassis.