Page 3-31
Installation
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Connecting T1/E1 and Primary Rate Interface (PRI) Trunks to the MDF
INSTALLATION
3
B. CONNECTING T1/E1 AND PRIMARY RATE INTERFACE (PRI) TRUNKS TO THE
MDF
7.11 The installation procedure used to connect T1/E1 and/or PRI trunks at the MDF is
dependent on the type of termination used by the telephone company [network provider] and
how close it is to the MDF. The T1/PRI or E1/PRI trunks may be terminated on RJ48C modu-
lar jacks [RJ45 line jack units] or on RJ-type terminal blocks.
For U.S. Systems
NOTE: See page 3-35 for the installation procedures for a European system.
7.12 Follow one of the three T1/PRI termination methods (A, B, or C) outlined below and on
page 3-33.
NOTE: The T1/PRI trunk is typically connected to the standard RJ48C jack provided on the T1
or T1/E1/PRI card. However, in certain situations, it may be more convenient to use the card's
DB15 connector instead. See page 3-37 for more information.
7.13 Method A – T1/PRI Trunks Terminated on RJ48C Jacks Near the MDF
7.14 Install T1/PRI trunks terminated on RJ48C jacks near the MDF as outlined below.
Plug one end of a four-pair, non-reversing (straight through), mod-to-mod line cord into
each telephone company RJ48C jack. The other end of each line cord is later plugged
into the T1 jack on the corresponding T1 or T1/E1/PRI card.
NOTE: Make sure the connectors on the ends of each line cord are properly attached.
If any of the wires are cracked or broken, T1/PRI transmission problems can occur.
7.15 Method B – T1/PRI Trunks Terminated on RJ48C Jacks Away from the MDF
7.16 Install T1/PRI trunks terminated on RJ48C jacks away from the MDF as outlined in the
following steps. See Figure 3-13 on the next page for a diagram of the complete layout.
1. Mount one eight-conductor modular jack assembly next to each telephone company
RJ48C jack.
2. For each modular jack assembly mounted in step 1, mount a corresponding four-con-
ductor modular jack assembly on the MDF backboard.
3. Connect the modular jack assemblies mounted in steps 1 and 2:
a. Run T1 cable between the corresponding modular jack assemblies.
NOTE: If the telephone company termination is more than 2000 feet (600 meters)
from the MDF, special T1 cable must be used (see page 2-54 for cable specifica-
tions). For shorter distances, two lengths of standard two-pair voice-frequency
cable (one cable for transmit and one cable for receive) may be used instead.
b.
Wire each end of the cables onto their respective modular jack assemblies. See
Figure 3-14 on the next page for a diagram of the wiring.
4. At the telephone company termination, plug one end of a four-pair, non-reversing
(straight through), mod-to-mod line cord into each RJ48C jack and plug the other end
into the corresponding modular jack assembly next to it.
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