Cisco SPA-2XCHOC12/DS0 Overview

SPA-2XCHOC12/DS0 is the Cisco ASR 9000 Series Shared Port Adapter. This Cisco 2-Port Channelized OC-12/STM-4 SPA is available on high-end Cisco routing platforms offering the benefits of network scalability with lower initial costs and ease of upgrades. The Cisco SPA/SIP portfolio continues the Cisco focus on investment protection along with consistent feature support, broad interface availability, and the latest technology. The Cisco SPA/SIP portfolio allows different interfaces (Packet over SONET/SDH [POS], ATM, Ethernet, etc.) to be deployed on the same interface processor.

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SPA-2XCHOC12/DS0 Specifications
Type	Cisco ASR 9000 Series Shared Port Adapter
Product compatibility	Cisco ASR 9000 Series Router
Port density per SPA	2-port channelized OC-12/STM-4
Physical interface (channelized OC-12)	OC-12c/STM-4 Small Form-Factor Pluggable (SFP) optics module Visual status indicators (LEDs): • SPA status LED • Per-port LEDs • Carrier and alarm • Active and loopback
Protocols	IETF RFC 1490, Frame Relay Encapsulation RFC 1662, Point-to-Point Protocol (PPP) in High-Level Data Link Control (HDLC)-like framing Cisco HDLC Multilink PPP (RFC 1990) (as applicable for 2-port channelized OC-12c/STM-4 (DS-1/E1) FRF.12, link fragmentation and interleaving (LFI) PPP, HDLC, and Frame Relay User Network Interface (UNI) encapsulations
Features and functions	DS-3 • Full- and half-duplex connectivity at DS-3 rate (44.736 MHz) • Scrambling and subrate support of major data-service-unit (DSU) vendors • C-bit or M23 framing (software selectable) • MDL • Support for 16- and 32-bit cyclic redundancy check (CRC) (16-bit default) • 24-hour history maintained for error statistics and failure counts • DS-3 alarm and event detection (once-per-second polling) • Alarm indication signal (AIS) • Out of frame (OOF) • Far-end receive failure (FERF) DS-1 • Superframe (SF) and Extended Superframe (ESF) support • ANSI T1.403 FDL support • Internal or line-derived (loop) clocking, independently selectable on each T1 tributary • Error and alarm detection: CRC errors, framing errors, loss of frame (red), AIS (blue), remote alarm indication (yellow) • Alarm reporting: 24-hour history maintained, 15-minute intervals on all errors • BERT at T1 level • Loopback capabilities: local, network line and network payload, remote network line, and remote network payload at the T1 level
SONET errors, alarms, and performance monitoring	Synchronization: • Local (internal) or loop timed (recovered from network) • Pointer activity monitoring • Redundant clock source should be provisioned on different SPAs as only a single timing source can be provided by SPA Local (diagnostic) and line (network) loopback Payload mapping • POS with 1 + X^43 self-synchronous scrambler SONET/SDH compliance: • Telcordia (Bellcore) GR-253-CORE (as applicable) • ANSI T1.105, T1.231 • ITU-T G.707, G.957, G.825 (as applicable) Supported SONET/SDH alarm and signal events: • Signal failure bit error rate (SF-ber) • Signal degrade bit error rate (SD-ber) • Signal label payload construction (C2) • Path trace byte (J1) • Section • Loss of signal (LoS) • Loss of frame (LoF) • Error counts for B1 • Threshold crossing alarms (TCA) for B1 • Line • Line alarm indication signal (LAIS) • Line remote defect indication (LRDI) • Line remote error indication (LREI) • Error counts for B2