PM4354 Просмотр технического описания (PDF) - PMC-Sierra

Номер в каталоге

Компоненты Описание

производитель

PM4354

FOUR CHANNEL COMBINED E1/T1/J1 TRANSCEIVER/FRAMER

PMC-Sierra 

RELEASED

PM4354 COMET-QUAD

DATASHEET

PMC-1990315

ISSUE 6

FOUR CHANNEL COMBINED E1/T1/J1

TRANSCEIVER / FRAMER

6

DESCRIPTION

The PM4354 Four Channel Combined E1/T1/J1 Transceiver and Framer (COMET-QUAD) is a

feature-rich monolithic integrated circuit suitable for use in long haul and short haul T1, J1 and E1

systems with a minimum of external circuitry. The COMET-QUAD is software configurable,

allowing feature selection without changes to external wiring.

Analog circuitry is provided to allow direct reception of long haul E1 and T1/J1 compatible signals

typically with up to 43 dB cable loss at 1024 kHz (E1) and up to 44 dB cable loss at 772 kHz

(T1/J1) using a minimum of external components. Typically, only line protection, a transformer

and a line termination resistor are required.

The COMET-QUAD recovers clock and data from the line and frames to incoming data. In T1

mode, it can frame to SF and ESF signal formats. In E1 mode, the COMET-QUAD frames to

basic G.704 E1 signals and CRC-4 multiframe alignment signals, and automatically performs the

G.706 interworking procedure. AMI, HDB3 and B8ZS line codes are supported.

The COMET-QUAD supports detection of various alarm conditions such as loss of signal, pulse

density violation, Red alarm, Yellow alarm, and AIS alarm in T1 mode and loss of signal, loss of

frame, loss of signaling multiframe and loss of CRC multiframe in E1 mode. The COMET-QUAD

also supports reception of remote alarm signal, remote multiframe alarm signal, and alarm

indication signal in E1 mode. The presence of Yellow and AIS patterns in T1 mode and remote

alarm and AIS patterns in E1 mode is detected and indicated. In T1 mode, the COMET-QUAD

integrates Yellow, Red, and AIS alarms as per industry specifications. In E1 mode, the COMET-

QUAD integrates Red and AIS alarms.

Performance monitoring with accumulation of CRC-6 errors, framing bit errors, line code

violations, and loss of frame events are provided in T1 mode. In E1 mode, CRC-4 errors, far end

block errors, framing bit errors, and line code violation are monitored and accumulated.

The COMET-QUAD provides one receive HDLC controller per channel for the detection and

termination of messages in the ESF facility data link (T1), national use bits (E1), or in any arbitrary

timeslot (T1 or E1). In T1 mode, the COMET-QUAD also detects the presence of in-band loop

back codes and ESF bit oriented codes. Detection and optional debouncing of the 4-bit Sa-bit

codewords defined in ITU-T G.704 and ETSI 300-233 is supported. An interrupt may be

generated on any change of state of the Sa codewords.

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-QUAD generates framing for SF and ESF formats. In E1 mode, the

COMET-QUAD generates framing for a basic G.704 E1 signal. The signaling multiframe

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

12

Share Link: