Cisco Shared Port Adapters SPA Interface Processors

Cisco 8-Port Clear Channel T3/E3 Shared Port Adapters Data Sheet

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The Cisco® I-Flex approach combines shared port adapters (SPAs) and SPA interface processors (SIPs) to provide an extensible design that enables service prioritization for data, voice, and video services. The I-Flex design maximizes connectivity options and offers superior service intelligence through programmable interface processors that deliver line-rate performance. I-Flex enhances speed-to-service revenue and provides a rich set of quality-of-service (QoS) features for premium service delivery while effectively reducing the overall cost of ownership. This data sheet contains the specifications for the Cisco 8-Port Clear Channel T3/E3 SPA (Cisco Clear Channel T3/E3 SPA; refer to Figure 1).

Figure 1. Cisco 8-Port Clear Channel T3/E3 SPA

Product Overview

Demand for high-capacity corporate backbones, high-speed access to the global Internet, and trunking connections for service provider internetworking has led to a growth in Clear Channel T3/E3 connections that has outpaced all other types and speeds of leased lines. This growth places tremendous strain on service providers and network managers who must provision and manage new T3/E3 connections. The Cisco Clear Channel T3/E3 SPA for the Cisco ASR 1000 Series Aggregation Services Routers offers high-density, highly manageable T3/E3 line connectivity and termination. With integrated line-interface data service units (DSUs) that allow T3/E3 lines to be directly terminated on a Cisco router, the Cisco Clear Channel T3/E3 SPA simplifies T3/E3 line management, replaces provisioning costs, and makes valuable rack space available.

The Cisco Clear Channel T3/E3 SPA is designed to provide direct connectivity to T3/E3 lines for full-duplex communications at the T3 rate of 44.736 MHz or E3 rate of 34.368 MHz. The Cisco 8-Port Clear Channel T3/E3 SPA offers 8 ports and the ports are configurable as T3 or E3 on the same SPA. To support the widest range of operational environments and to offer the greatest flexibility in provisioning Clear Channel T3/E3 connections, the Cisco Clear Channel T3/E3 SPA takes a groundbreaking step and brings together proprietary subrate and scrambling features of T3/E3 Data Service Unit (DSU) vendors Quick Eagle Networks (formerly Digital Link), Larscom, ADC Kentrox, Adtran, and Verilink. Subrate support in the Cisco Clear Channel T3/E3 SPA maximizes the application of these products in service provider environments for tiered T3 services. By simultaneously supporting interoperability with a wide range of third-party DSU vendors, the Cisco Clear Channel T3/E3 SPA offers the flexibility to support installed equipment without committing customers to a proprietary solution.

The Cisco Clear Channel T3/E3 SPA is hot-swappable and supports service-transparent online insertion and removal (OIR), allowing removal of the SPA without affecting the interface processor and other SPAs.


You can use the Cisco Clear Channel T3/E3 SPA to provide direct customer access or network-to-network connections. In some cases, T3/E3 offers the only high-speed service to remote points of presence (POPs) or customer installations that cannot obtain optical channelized service.

The Cisco Clear Channel T3/E3 SPA supports three different Layer 2 encapsulations of packets:

Point-to-Point Protocol (PPP)

High-Level Data Link Control (HDLC)

Frame Relay

By supporting these three encapsulations, the Cisco Clear Channel T3/E3 SPA enables the Cisco ASR 1000 Series Routers to offer high-speed, IP-based direct access, or IP-over–Frame Relay deployments (Figure 2).

Figure 2. IP-Based Direct Access or IP-over–Frame Relay Deployments

Features and Benefits

The Cisco 8-Port Clear Channel T3/E3 SPA offers many advantages, including:

Eight-port Clear Channel T3 or E3 options.

Integrated DSU functions.

Interoperability with all Cisco T3/E3-capable products and products from other leading T3/E3 DSU and Frame Relay equipment vendors.

Full-duplex, full-rate, and subrate support.

The Cisco SPA/SIP portfolio offers the following additional advantages:

Highly modular, flexible, intelligent interface processors.

- Superior flexibility, supporting a combination of interface types on the same interface processor for consistent services, independent of access technology.

- Pioneering programmable interface processors that provide flexibility for the service diversity required in next-generation networks.

- Innovative design that supports intelligent service delivery without compromising on performance.

Increased speed to service revenue

- The scalable, programmable Cisco architecture extended to 10 Gbps dramatically improves customer density, increasing potential revenue per platform.

- Interface breadth (copper, Channelized, Packet over SONET [PoS], ATM, and Ethernet) on a modular interface processor allows service providers to roll out new services more quickly, helping ensure that all customers large and small receive consistent, secure, and guaranteed services.

- High-density Small Form-Factor Pluggable (SFP) interfaces are featured for high–port-count applications with reach flexibility. Future optical technology improvements can be adopted using existing SPAs.

Dramatically improved financials of your routing purchase

- Improved slot economics and increased density reduce capital expenditures (CapEx).

- The ability to easily add new interfaces as they are needed enables a “pay-as-you-grow” business model.

Product Specifications

Table 1 lists the specifications of the Cisco 8 -Port Clear Channel T3/E3 SPA.

Table 1. Product Specifications



Product compatibility

Cisco ASR 1000 Series Routers
Cisco IOS ® XE Software Release 3.8 and later: Cisco ASR 1002-X, ASR1004, ASR 1006, and ASR 1013
Cisco IOS XE Software Release 3.9 and later: Cisco ASR 1001 and ASR 1002
Cisco IOS XE Software Release 3.8 and later: Cisco ASR 1000 Series SIP40
Cisco IOS XE Software Release 3.9 and later: Cisco ASR 1000 Series SIP10

Port density per SPA

8-port options

Physical interface

1.0/2.3 RF connector (75-ohm impedance)
1.0/2.3 RF-to-BNC adapter cable option


Serial encapsulations:

PPP, RFC 1662
Frame Relay, RFC 1490

Features and functions

Up to 8 independent T3 or E3 ports configurable as either T3 or E3
Full-duplex connectivity at T3 rate (44.736 MHz) or E3 rate (34.368 MHz)
Subrate and scrambling support of Quick Eagle Networks (formerly Digital Link), Larscom, ADC Kentrox, Adtran, and Verilink DSUs
Internal or network clock selectable per channel
Line and payload loopback capabilities:

Local and remote loopback at the T3 level

Response to embedded loopback commands

Insertion of loopback commands into transmitted signal

Bit-error-rate-testing (BERT) pattern generation and detection per channel

Selectable pseudorandom pattern up to 32 bits long, including all 0’s, all 1’s, 215, 220, 220 Quasi-Random Signal Sequence (QRSS), 223, and alternating 0’s and 1’s

32-bit error-count and bit-count registers

Fully independent transmit and receive sections

Detection of test patterns with bit error rates up to 10-2

24-hour history maintained for error statistics and failure counts, at 15-minute intervals
16- and 32-bit cyclic redundancy check (CRC); 16-bit default

T3-specific features

C-bit or M23 framing
Binary 3-zero substitution (B3ZS) line coding
T3 far-end alarm and control (FEAC) channel support
Compliance with T3 pulse mask per ANSI T1.102-1993
Maintenance data link (MDL)
Line build-out up to 450 feet (135 meters)
Alarm monitoring

Alarm indication signal (AIS)

Loss of signal (LOS)

Out of frame (OOF)

Far-end receive failure (FERF)

Performance data collection

Line coding violation (LCV)

Framing bit errors (F- or M-bit errors)

P-bit error counts

C-bit error counts

Far-end block error (FEBE) counts

E3-specific features

G.751, or G.832 and unframed
High-density bipolar with three zeroes (HDB3) line coding
Compliance with E3 pulse mask
Software-configurable E3 national service bits

Alarm monitoring

Alarm indication signal (AIS)

Loss of signal (LOS)

Out of frame (OOF)

Far-end receive failure (FERF)

Performance data collection

Line coding violation (LCV)

Framing-pattern errors

FEBE counts

Reliability and availability

Single SPA software reset


RFC 2496 MIB (T3 MIB) and T1.231 MIB

Network management

Simple Network Management Protocol (SNMP)

Physical specifications

Weight: 0.75 lb (0.34 kg) Height: 0.8 in. (2.03 cm) (single height) Width: 6.75 in. (17.15 cm) Depth: 7.28 in. (18.49 cm)


2-port: 7.7W maximum 4-port: 8.4W maximum8-port: 16W maximum

Compliance and agency approvals

CE Marking


UL 60950
CSA 22.2 No.60950
IEC 60950
EN 60950
AS/NZS 3260


CFR47 Part 15
ICES 003
AS/NZ 3548

Telecom (T3)

ANSI T1 107
T1 404
AT&T 54014

Telecom (E3)


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

Ordering Information

To place an order, visit the Cisco Ordering Home Page and refer to Table 2.

Table 2. Ordering Information

Note: SPA-4XT3/E3 and SPA-2XT3/E3 cables are not supported with SPA-8XT3/E3.

Product Name

Part Number

Cisco 8-Port Clear Channel T3/E3 Shared Port Adapter


T3 or E3 Cable, DIN, BNC Female connector, 10 Feet


T3 or E3 Cable with DIN, BNC male connector, 10 Feet


T3 or E3 Cable with DIN, DIN, Female/Female connectors, 10 Feet


Service and Support

Cisco offers a wide range of services programs to accelerate customer success. These innovative services programs are delivered through a unique combination of people, processes, tools, and partners, resulting in high levels of customer satisfaction. Cisco Services help you protect your network investment, optimize network operations, and prepare your network for new applications to extend network intelligence and the power of your business. For more information about Cisco Services, refer to Cisco Technical Support Services or Cisco Advanced Services.

For More Information

For more information about the Cisco SPA/SIP portfolio, visit or contact your local Cisco account representative.