PM4351 datasheet(39/485 Pages) PMC

39 / 485 page

STANDARD PRODUCT

PM4351 COMET

DATA SHEET

PMC-1970624

ISSUE 10

COMBINED E1/T1 TRANSCEIVER

PROPRIETARY AND CONFIDENTIAL

Dual (transmit and receive) elastic stores for slip buffering and rate adaptation to

backplane timing are provided, as is a signaling extractor that supports signaling

debounce, signaling freezing, idle code substitution, digital milliwatt tone

substitution, data inversion, and signaling bit fixing on a per-channel basis.

Receive side data and signaling trunk conditioning is also provided.

In T1 mode, the COMET generates framing for SF, ESF and T1DM (DDS)

formats. In E1 mode, the COMET generates framing for a basic G.704 E1

signal. The signaling multiframe alignment structure and the CRC multiframe

structure may be optionally inserted. Framing can be optionally disabled.

Internal analog circuitry allows direct transmission of long haul and short haul T1

and E1 compatible signals using a minimum of external components. Typically,

only line protection, a transformer and an optional line termination resistor are

required. Digitally programmable pulse shaping allows transmission of DSX-1

compatible signals up to 655 feet from the cross-connect, E1 short haul pulses

into 120 ohm twisted pair or 75 ohm coaxial cable, E1 long haul pulses into

120 ohm twisted pair as well as long haul DS-1 pulses into 100 ohm twisted pair

with integrated support for LBO filtering as required by the FCC rules. In

addition, the programmable pulse shape extending over 5-bit periods allows

customization of short haul and long haul line interface circuits to application

requirements.

Digital line inputs and outputs are provided for applications not

requiring a physical T1 or E1 interface.

In the transmit path, the COMET supports signaling insertion, idle code

substitution, digital milliwatt tone substitution, data inversion, and zero code

suppression on a per-channel basis. Zero code suppression may be configured

to Bell (bit 7), GTE, or DDS standards, and can also be disabled. Transmit side

data and signaling trunk conditioning is also provided. Signaling bit transparency

from the backplane may be enabled.

The COMET provides three transmit HDLC controllers. These controllers may

be used for the transmission of messages on the ESF data link (T1) or national

use bits (E1) and in any time slot. In T1 mode, the COMET can be configured to

generate in-band loop back codes and ESF bit oriented codes. In E1 mode,

transmission of the 4-bit Sa codewords defined in ITU-T G.704 and ETSI 300-

233 is supported.

The COMET provides optional jitter attenuation in both the transmit and receive

directions.

The COMET provides both a parallel microprocessor interface for controlling the

operation of the device and serial PCM interfaces that allow backplane rates

from 1.544 Mbit/s to 8.192 Mbit/s to be directly supported. Up to four COMET

devices can be multiplexed on a byte-interleaved basis on a common bus with

PM4351 Datasheet(PDF) 39 Page - PMC-Sierra, Inc

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