Nortel Networks Circuit Card 311 - Manual (Page 270)

270 NT5D33 and NT5D34 Lineside E1 Interface cards
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 circuit during calls. The circuits
receive outgoing call signaling messages from the controller and return
incoming call status information to the controller over the DS-30X network
loop.
Card control functions
Control functions are provided by a microcontroller and a card LAN link on
the LEI. A sanity timer is provided to automatically reset the card if the
microcontroller stops functioning for any reason.
Microcontrollers
The LEI contains a microcontroller that controls the internal operation of the
card and the serial card LAN link to the controller card. The microcontroller
controls the following:
• reporting to the CE CP through the card LAN link
— card identification (card type, vintage, serial number)
— firmware version
— self-test results
— programmed unit parameter status
• receipt and implementation of card configuration
— control of the E1 line interface
— enabling/disabling of individual units or entire card
— programming of loop interface control circuits for administration of
channel operation
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.