STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
• Supports line and path performance monitoring according to AT&T and ANSI
specifications. Accumulators are provided for counting ESF CRC-6 errors,
framing bit errors, line code violations and loss of frame or change of frame
alignment events.
• Provides ESF bit-oriented code detection and an HDLC/LAPD interface for
terminating the ESF facility data link.
• Supports polled or interrupt-driven servicing of the HDLC interface.
• Extracts the data link in ESF and T1DM (DDS) modes. Optionally extracts a
datalink in the E1 national use bits.
• Extracts 4-bit codewords from the E1 national use bits as specified in
ETS 300 233
• Extracts up to three HDLC links from arbitrary time slots to support the D-
channel for ISDN Primary Rate Interfaces and the C-channels for V5.1/V5.2
interfaces.
• Detects the V5.2 link identification signal.
• Provides a two-frame elastic store buffer for backplane rate adaptation that
performs controlled slips and indicates slip occurrence and direction.
• Provides DS-1 robbed bit signaling extraction, with optional data inversion,
programmable idle code substitution, digital milliwatt code substitution, bit
fixing, and two superframes of signaling debounce on a per-channel basis.
• Frames to the E1 signaling multiframe alignment when enabled and extracts
channel associated signaling. Alternatively, a common channel signaling data
link may be extracted from timeslot 16.
• Can be programmed to generate an interrupt on change of signaling state.
• Provides trunk conditioning which forces programmable trouble code
substitution and signaling conditioning on all channels or on selected
channels.
• Provides diagnostic, line loopbacks and per-DS0 line loopback.
• Provides an integral pattern detector that may be programmed to detect
common pseudo-random sequences. The programmed sequence may be
detected in the entire frame, or on an NxDS0 basis.
PROPRIETARY AND CONFIDENTIAL
3
PMC [ PMC-SIERRA, INC ]
