PM4354-PI datasheet(49/463 Pages) PMC

49 / 463 page

RELEASED

PM4354 COMET-QUAD

DATASHEET

PMC-1990315

ISSUE 6

FOUR CHANNEL COMBINED E1/T1/J1

TRANSCEIVER / FRAMER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMERS’ INTERNAL USE

Figure 5

- External Analog Interface Circuits

TXTIP1

TXTIP2

TV REF

TXRING1

RXTIP

TXRING2

RXRING

ATB

One of Four

T1 or E1 Transceiver / Framers

Figure 5 gives the recommended external protection circuitry for designs required to meet the

major surge immunity and electrical safety standards including FCC Part 68, UL1950, and

Bellcore TR-NWT-001089. Standards compliance testing of this circuitry has not completed as of

the date of publication of this document.

For systems not requiring phantom feed or inter-building line protection, the Bi-directional

Transient Surge Suppressors (Z1-Z4), their associated ground connection and the center tap of

the transformer can be removed from the circuit.

See Table 1 for the descriptions of components for Figure 5. See Table 2 for the descriptions of

values for the transformer turns ratio, n, Rt1 and Rt2 for Figure 5.

Note that the crowbar devices (Z1 – Z4) are not required if the transformer’s isolation rating is not

exceeded.

PM4354-PI Datasheet(PDF) 49 Page - PMC-Sierra, Inc