Ericsson LBI-39001 Návod k obsluze stáhnout pdf (Strana 29)

712M I/O Transition Module

The 712M is a separate circuit board which receives the PIC I/O lines from the P2 Adapter Assembly ribbon cables and

routes them to the appropriate industry standard connector on its front panel. The I/O Transition Module has four DB-25

connectors for serial I/O, a 50-pin SCSI port connector, a DB-15 connector for Ethernet, and a Centronics compatible printer

connector. Jumpers on the I/O Transition Module allow the serial ports to be configured as DTE or DCE. The I/O Transition

Module has sockets for SCSI terminating resistors.

4.1.1.2. Multisite Interface Controller (MIC)

The Multisite Interface Controller (MIC) allows the PI to communicate over X.25, LAPB, ADCCP, HDLC, or Bit

Synchronous connections. The hardware of the MIC consists of a base board and a mezzanine. The model of the mezzanine

board determines the electrical interface of the WanServer ports and the number of ports. The mezzanines available are as

follows: four port RS-232, four port RS-422, and two port EIA-530.

The firmware of the WanServer fv5310 provides the host processor with a common interface regardless of the port

protocols. Only the initial adaptation data provided at power-up are protocol-dependent.

An RS-422 port mezzanine is used in the Jessica application. The MIC provides the communication link between the PI

and the PIM in the IMC. The LAPB implementation is used.

4.1.1.3. Primary Rate Interface (PRI)

The PRI-64 ISDN card is a VME bus-compliant E1 interface card optimized for data formatting and transmission in

digital switching applications. This card supports two E1 spans: one from the E1 MUX carrying IMC audio channel

information, the other from the MD110 ISDN interface. On-board dual port RAM is used to facilitate communication with

the PI MIC card via the VME bus.

Each E1 interface supports ISDN primary rate signaling (30B + D, i.e., 30 audio connections plus a control channel).

The B channel connections can support HDLC protocols where operated as data links. The PRI card is supplied equipped

with all necessary ISDN software to control call functions as defined in layers 1 through 3 of the ISDN specification, i.e.,

I.430, Q.921, and Q.931. An interface driver is also supplied to provide a comprehensive communication mechanism with

the PI application software.

For the North American market, the PRI-48 ISDN card is used, with the corresponding decrease in B channels from 30 to

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Ericsson LBI-39001 Návod k obsluze Strana 29