Card Interfaces; E1 Interface Circuit; Signaling And Control - Avaya Nortel Communication Server 1000 Reference

NT5D33 and NT5D34 Lineside E1 Interface cards
was to use analog ports and channel bank equipment. With the LEI, a direct connection is
provided to the IPE. No channel bank equipment is required, resulting in a more robust and
reliable connection.
When used for connecting to third-party applications equipment, the LEI offers a number of
benefits. It is a more cost-effective alternative for connection because it eliminates the need
for expensive channel bank equipment. The LEI card supports powerful E1 monitoring, and
diagnostic capability. Overall costs for customer applications may also be reduced because
the E1-compatible IPE is often more attractively priced than the analog-port alternatives.
The LEI is compatible with all IPE-based systems and with standard public or private CEPT-
type carrier facilities. It supports CRC-4- or FAS only framing formats as well as AMI or HDB3
coding. Because it uses standard PCM in standard E1 timeslots, existing E1 test equipment
remains compatible for diagnostic and fault isolation purposes. A/B Bit signaling may be
customized according to the user's system, including the Australian P2 signaling scheme.

Card interfaces

The LEI passes voice and signaling data over DS-30X loops through the DS-30X Interface
circuits and maintenance data over the card LAN link.

E1 interface circuit

The LEI contains one E1 line-interface circuit which provides 30 individually configurable voice
interfaces to one E1 link in 30 different time slots. The circuit demultiplexes the 2.56 Mbps
DS-30X transmit signaling bitstreams from the DS-30X network loop and converts it into 2.048
mHz E1 transmit signaling bitstreams onto the E1 link. It also does the opposite, receiving
receive signaling bitstreams from the E1 link and transmitting receive signaling bitstreams onto
the DS-30X network loop.
The E1 interface circuit provides the following:
• An industry standard CEPT (0 to 655 feet) interface
• DS-30X signaling protocol into FXO A- and B-channel-associated signaling protocol
• Switch-selectable transmission and reception of E1 signaling messages over an E1 link
in either loop or ground start mode
• Switch-selectable call processing between the Australian P2, North American Standard,
or other user-configurable schemes

Signaling and control

The LEI also contains signaling and control circuits that establish, supervise, and take down
call connections. These circuits work with the system controller to operate the E1 line interface
200 Circuit Card Reference
Comments? infodev@avaya.com
July 2011