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Description
P0914209
Standard 3.00
April 2000
Physical description
Local mini-carrier remote interface card
The Local Mini-Carrier Remote Interface card (LMI) is a new circuit pack
which resides in any two consecutive IPE card slots normally used for IPE
circuit packs. The LMI consists of a motherboard and a daughterboard. The
motherboard is a standard IPE-sized circuit pack with a double-wide
faceplate. The daughterboard is a small circuit board that picks up the
DS-30X bus connections from the adjacent card slot. The daughterboard
mounts to the motherboard through 5 standoffs. The first card slot’s 25 pair
connector is used to plug into the LMI Multi-I/O cable assembly (NT5D85),
see Figure 5 on page 17) that provides connection to the carriers, MMI, SDI,
and alarm. The second card slot’s 25 pair connector provides connection to
all three LMX boards.
Signaling Interface
The Signaling Interface block provides an interface between the signaling
channels on the DS-30X and the processor. Signaling bytes will be extracted
from both DS-30Xs and sent to the processor under interrupt control. The
processor will also be able to send signaling messages into the DS-30Xs.
T1
The T1 interface is capable of driving 655 feet without a repeater. A CSU is
required for connection to the Public Switched Telephone Network (PSTN).
Processor
The processor is a 68000-based processor that controls all on-board
functions. The processor controls all LMI operation and steers the proper
carrier time slots to each DS-30X channel. The microprocessor has its own
EPROM and RAM for program and data storage.
CardLAN
The cardLAN interface is the same as that of the XDLC card, providing
self-test and maintenance information. The cardLAN interface circuitry
responds to both card slot addresses, acting to the switch as two independent
circuit packs. The circuit pack responds to all cardLAN messages sent to both
card slots. In the event that the circuit pack has a failure, both card slots
indicate the failure.
