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1-Port Clear Channel DS3/E3 GPIM Network Interface Specifications

The 1-Port Clear Channel DS3/E3 Gigabit-Backplane Physical Interface Module (GPIM) provides the network interface specifications for DS3 or E3 modes, listed in Table 43.

Table 43: 1-Port Clear Channel DS3/E3 GPIM Network Interface Specifications

Description	DS3 Mode	E3 Mode
Network Interface Specifications
Line encoding	B3ZS	HDB3
Framing	M23 (default) C-bit	G.751 (default)
Substrate and scrambling	Vendor algorithms supported: Verilink Kentrox Digital Link Larscom Adtran	Vendor algorithms supported: Kentrox Digital Link
Network alarms	Supported in accordance with the ANSI specification: Loss of Signal (LOS) Out of Frame (OOF) Loss of Frame (LOF) Alarm Identification Signal (AIS) Remote Defect Identification (RDI)	Supported in accordance with the ITU-T specification: LOS OOF AIS RDI Phase Locked Loop (PLL)
Error counters	Incremented during a periodic 1-second polling routine: Line Code Violations (LCV) P-bit Code Violations (PCV) C-bit Code Violations (CCV) Line Errored Seconds (LES) P-bit Errored Seconds (PES) C-bit Errored Seconds (CES) Severely Errored Framing Seconds (SEFS) P-bit Severely Errored Seconds (PSES) C-bit Severely Errored Seconds (CSES) Unavailable Seconds (UAS)	Incremented during a periodic 1-second polling routine: Frame Alignment Error (FAE) Bipolar Coding Violations (BCV) Excessive Zeros (EXZ) LCV LES SEFS UAS
HDLC Features
MTU	Default (4474 bytes) or maximum jumbo (up to 9192 bytes)	Default (4474 bytes) or maximum jumbo (up to 9192 bytes)
Shared flag	Supported	Supported
Idle flag/fill (0x7e or all ones)	Supported	Supported
Counters	Runts, giants	Runts, giants

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