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MPC8280 Datasheet(PDF) 907 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 907 Page - Freescale Semiconductor, Inc |
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907 / 1386 page  Multi-Channel Controllers (MCCs) MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 29-17 29.3.4 Channel-Specific SS7 Parameters Based on the HDLC protocol, the signalling system #7 (SS7) protocol is used to manage public service networks. The SS7 protocol operates on signal units (SU), which are analogous to HDLC frames. The physical, data link, and network layer functions of the SS7 protocol are called the message transfer part (MTP). Implementing the MTP layer 2 (data link) functions in host software is difficult with multiple performance issues. The MPC8280 SS7 microcode enables applications requiring multi-channel SS7 processing. The SS7 controller is implemented using the MCC hardware with microcode running on the CPM. Each MCC implements the following layer 2 portions of the MTP: • Signal unit (SU) retransmission • Automatic fill-in signal unit (FISU) transmission • Short SU filtering • Duplicate fill-in and link-status signal unit (FISU/LSSU) filtering • Octet counting • Signal unit error rate monitoring • Good frame counter and bad frame counting • Initial alignment (supports alignment error rate monitoring) Host software, however, is needed to handle the following higher-level functions of the MTP layer 2 not supported by the SS7 controller: • Link state control • Flow control SS7 features are as follows: • Up to 128 independent communication channels (64 channels per MCC) • Independent mapping for receive and transmit • Standard HDLC features — Flag/Abort/Idle generation/detection — Zero insertion/deletion — 16-bit CRC-CCITT generation/checking — Detection of non-octet aligned signal units — Programmable number of flags between signal units • Maintenance of signal unit error monitor (SUERM) • Maintenance of alignment error rate monitor (AERM) • Maintenance of separate counters for error-free and bad frames • Detection and stripping of long signal units • Discard of short signal units (less than 5 octets) • Transmission of signal units with a programmable delay (applies to JT-Q.703 standard) • Automatic transmission of fill-in signal units (FISU) |
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