Isdn Pri Prerequisites; Csu Required; Isdn Pri Recommendations - 3Com 3C10111C - NBX 100 - Modular Exp Base Installation Manual

ISDN PRI
Prerequisites

CSU Required

ISDN PRI
Recommendations
CSU — An external CSU (Channel Service Unit) is required with each
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T1 installation. Many CSUs support conversion of ESF (with B8ZS)
services into D4 (with AMI). In some locations it may be easier to order
the T1 as ESF with B8ZS and perform the conversion in the CSU. You
must verify that the CSU supports this conversion.
Before you install and configure ISDN PRI services on T1 circuits, gather
the following information and have it available at the time of installation:
All telephone numbers to be activated
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PRI circuit ID
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Carrier's testing department name and telephone numbers
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Carrier's circuit provisioning department names and numbers
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Carrier's account representative account information
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Requested smart jack be installed in customer's suite (not at the
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minimum point of entry)
Each PRI installation requires an external Channel Service Unit (CSU).
For ISDN PRI services, 3Com recommends the settings discussed in the
following sections.
Framing Type — The recommended (also the default) configuration
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is Extended Super Frame (ESF).
The multi-frame formats F4, F12 (D4 or SF), and F72 are also
supported.
Zero Code Suppression — The recommended (also the default)
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configuration is B8ZS.
AMI is also supported, but 3Com does not recommend this choice.
DID Applications — For DID or DNIS, 3Com recommends that you
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order telephone numbers that easily fit in the NBX system numbering
plan. If possible, use 3 or 4 digit DID/DNIS codes, which allow for
simple dial plan implementation.

ISDN PRI Prerequisites

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