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Specifications
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
Loop Start and Ground Start Trunk Circuit Cards
SPECIFICATIONS
2
H. LOOP START AND GROUND START TRUNK CIRCUIT CARDS
NOTE: LGCs and LGC-Ds are not supported in Europe.
4.136 Each LGC and LSC has circuitry for up to four analog trunks. For increased capacity, a
daughter card (LGC-D or LSC-D) can be attached to each LGC or LSC to provide four addi-
tional circuits.
4.137 LSCs and LSC-Ds can have only loop start trunks connected to them. LGCs and LGC-
Ds can have either loop start or ground start trunks. Individual trunks may be designated as
either loop start or ground start in DB Programming.
NOTE: LGC-Ds cannot be installed on LSCs, and LSC-Ds cannot be installed on LGCs.
4.138 For optimal CO trunk transmission performance, each analog trunk circuit should be
“hybrid balanced” in DB Programming. Hybrid balancing refers to selecting the balance net-
work – normal or short – that best matches the trunk’s impedance.
4.139 Each LGC, LGC-D, LSC, and LSC-D has four specially-designed fuses soldered to the
card to protect it from large voltage surges due to lightning. If a fuse is open (blown), it may
mean that other parts of the card have also been damaged. For this reason, open fuses must not
be replaced in the field. Instead, the entire card must be returned for testing and possible repair.
Failure to follow this policy voids the warranty on the card.
4.140 Each card has a green LED (CARD ON-LINE) to indicate the card’s functional readi-
ness and a yellow LED (CIRCUIT BUSY) to indicate if any circuit on the card is busy (see
Figures 3-59 and 3-60 on pages 3-122 and 3-123). Also, each card has a metal EMI shield
attached to the front edge to help prevent electromagnetic interference.
4.141 When the system is in the default configuration, all trunks are configured for DTMF
signaling. If necessary, some or all of the trunks can be reprogrammed for dial-pulse signaling
through DB Programming.
NOTE: Single-line sets generate their own DTMF tones when dialing. If used on dial-pulse
trunks, both the DTMF tones generated by the phone and the dial-pulse signals generated by
the system are sent to the central office [local exchange], which may be a problem if the central
office [local exchange] recognizes both. To avoid this problem, single-line sets should be
restricted to ARS-only when using dial-pulse trunks. Then, only the ARS-generated dial-pulse
signals are sent to the central office [local exchange].
4.142 The CO circuits are assigned hardware address numbers according to the card’s slot in
the equipment chassis and the location of the circuit on the card. For example, when using the
initial configuration, CO circuit 07.04.01 is the fourth circuit on the LSC installed in slot 7.
Each trunk card circuit is assigned a six-digit circuit number XX.YY.ZZ, where XX = the card
slot location (01-07 or 09-15), YY = the circuit number on the card (01-08), and ZZ = whether
the circuit has more than one purpose (currently 01 only).
4.143 When the system is in the default configuration, the first four buttons on each phone are
assigned as CALL buttons for incoming call indication/access. (The ANSWER button may
also be used to access incoming calls.) No individual trunk buttons or trunk group buttons are
assigned. Button assignments can be designated in DB Programming. See PROGRAMMING,
page 6-306, for more information.
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