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


Cisco ASR 9000 Series Aggregation Services Routers

Cisco ASR 9000 Series Aggregation Services Routers

High performance routers built to serve demanding edge markets


Edge networks serve billions of devices with low-latency services. You need feature rich routers that economically scale with bandwidth demand.The ASR 9000 series is your edge routing device capable of supporting the application performance required to power 5G service needs.



Sub Brands



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)


• 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)


• 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

• TCA for B2

• Path

• Path alarm indication signal (PAIS)

• Path remote defect indication (PRDI)

• Path remote error indication (PREI)

• Error counts for B3

• TCA for B3

• Loss of pointer (LoP)

• Positive stuffing event (PSE)

• Negative stuffing event (NSE)

• Path unequipped indication signal (PUNEQ)

• Path payload mismatch indication signal (PPLM)

Network management SONET-MIB (RFC 3592)



DS-3/E3-MIB (RFC 3896)

DS-1/E1-MIB (RFC 2496)

Simple Network Management Protocol (SNMP)

Reliability and availability Online insertion and removal (OIR)

Field-replaceable SFP optical modules

1+1 SONET Automatic Protection Switching (APS) and SDH Linear Multiplexer Section Protection (MSP) protocols (please check platform support)

Single SPA software reset

Physical specifications Weight: 1.27 lb (0.57 kg)

Height: 1.56 in. (3.96 cm) (double height)

Width: 6.75 in. (17.15 cm)

Depth: 7.28 in. (18.49 cm)

Power 2-port channelized OC-12/STM-4 = 52.0W (with optics)
Environmental specifications Operating temperature: 41 to 104°F (5 to 40°C)

Storage temperature: -38 to 150°F (-40 to 70°C)

Operating humidity: 5 to 85% relative humidity

Storage humidity: 5 to 95% relative humidity

Compliance and agency approvals Safety

• UL 60950

• CSA 22.2-No.60950

• EN60950

• IEC 60950 CB Scheme

• ACA TS001

• AS/NZS 3260

• EN60825\IEC60825 laser safety (SR, IR-Class 1) (VSR-Class 1M)1

• 21CFR1040 -FDA Code of Federal Regulations (USA) laser safety (SR, IR-Class 1) (VSR-Class 1M)1


• FCC Part 15 (CFR 47)

• ICES 003

• EN55022

• CISPR 22



• EN55024

• EN50082-1

• EN61000-6-1

• EN61000-3-2

• EN61000-3-3

Network Equipment Building Standards (NEBS)

This product is designed to meet the following requirements (official qualification may be in progress):

• SR-3580 – NEBS: Criteria levels (Level 3 compliant)

• GR-63-CORE – NEBS: Physical protection

• GR-1089-CORE – NEBS: EMC and safety


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