Cisco Shared Port Adapters SPA Interface Processors

Cisco 8-Port Channelized T1/E1 Shared Port Adapter Version 2 Data Sheet

  • Viewing Options

  • PDF (474.1 KB)
  • Feedback

The Cisco® 8-Port Channelized T1/E1 Shared Port Adapter (SPA) Version 2 takes advantage of the Cisco I-Flex approach, which combines shared port adapters and SPA interface processors (SIPs). This extensible design helps prioritize data, voice, and video services. Enterprise and service provider customers can take advantage of improved slot economies, which result from modular port adapters that are interchangeable across Cisco routing platforms. The I-Flex design increases connectivity options and offers superior service intelligence through programmable interface processors that can 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.

Figure 1.      Cisco 8-Port Channelized T1/E1 Shared Port Adapter Version 2

Product Overview

Today’s global enterprise and service provider networks require diverse networking solutions to meet both economic and evolving connectivity needs. The demand for high-density, cost-effective solutions increases as corporate intranets expand to include more regional offices and increased numbers of remote and mobile users.

The Cisco 8-Port Channelized SPA T1/E1 Version 2 (Figure 1) provides one of the greatest densities currently available in the industry at 8 ports per SPA and up to 32 ports per SIP. The cost per T1 or E1 port is less than that of a standard serial port with external channel service unit (CSU) or data service unit (DSU), which makes the Cisco 8-Port Channelized T1/E1 SPA Version 2 cost-effective for all WAN connectivity.

This SPA is designed to provide a full 8-port channelized solution for Cisco 6500 Series, 7600 Series, ASR1000 Series, ASR9000 Series and 12000 Series Routers. The interfaces can be channelized, fractional, or unframed (E1) with up to 256 independent High-Level Data Link Control (HDLC) channels definable for T1 and E1 applications. With these capabilities, the Cisco 8-Port Channelized SPA T1/E1 Version 2 eliminates the need for separate interface types for separate connection requirements.

Multilink Point-to-Point Protocol (MLPPP) is supported in hardware to allow link aggregation greater than T1 capacity. Up to eight individual T1s can be combined within a multilink bundle that appears to be a single IP link. As a result, service providers can provision greater-than-T1 bandwidth incrementally, without migrating the circuit and customer premises equipment (CPE) infrastructure to T3 facilities.

The Cisco 8-Port Channelized T1/E1 SPA Version 2 is hot-swappable and supports service-transparent online insertion and removal (OIR), allowing removal of the adapter without affecting the interface processor and other SPAs.


The Cisco 8-Port Channelized T1/E1 SPA Version 2 is ideal for service providers and large enterprises that want to cost-effectively deploy high-density terminations for multiple remote sites (Figure 2). The SPA helps enable applications that need to terminate remote and branch-office locations on a single router in a corporate enterprise network. For service provider applications where only DSU functions are required (for example, at sites colocated with a carrier), the Cisco 8-Port Channelized T1/E1 SPA Version 2 provides high port density at a reduced cost per port. For E1 applications, the channelized E1/G.703 interface allows direct connectivity to 120-ohm G.703 lines.

Figure 2.      High-Density Termination for Multiple Remote Sites

Features and Benefits

The Cisco 8-Port Channelized T1/E1 SPA Version 2 offers many advantages, including:

   Eight software-configurable T1 or E1 ports

   Support for channelized and fractional T1 and E1, as well as clear channel E1

   256 independent HDLC channels

   Integrated CSUs and DSUs

   Support for all major encapsulations, including MLPPP and multilink Frame Relay (MLFR)

   Support for link fragmentation and interleaving (LFI) over Frame Relay and MLPPP

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

   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 significantly improves customer density, increasing potential revenue per platform.

     Interface breadth (copper, channelized, 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.

   Improved return on your routing investment

     Improved slot economies and increased density help reduce capital expenditures (CapEx).

     The ability to easily add new interfaces as they are needed facilitates a "pay-as-you-grow" business model.

     SPAs are shared across multiple platforms and can be moved easily from one to another, providing consistent feature support, accelerated product delivery, and a significant reduction in operating expenses (OpEx) through common sparing as service needs change.

Product Specifications

Table 1 gives specifications of the Cisco 8-Port Channelized T1/E1 SPA Version 2.

Table 1.       Product Specifications



Product compatibility

Cisco 7600 Series Routers

Cisco XR 12000 Series Routers

Cisco ASR 1000 Series Aggregation Services Routers

Cisco ASR 9000 Series Routers

Minimum software version

Cisco 7600 Series Routers - Cisco IOS® 15.4(1)S

Cisco XR 12000 Series Routers - Cisco IOS XR 5.1.1

Cisco ASR 1000 Series Router - Cisco IOS XE 3.10.1

Cisco ASR 9000 Series Router - Cisco IOS XR 5.1.1

Port density per SPA

8 ports

Physical interface

  RJ-45 connector
  RJ-45 to BNC adapter cable option


Encapsulation protocols:

  Point-to-Point Protocol (PPP), RFC 1662
  Frame Relay, RFC 1490

Multilink support:

  MLPPP, RFC 1990
  MLFR, FRF.16
  LFI over Frame Relay (FRF.12) and MLPPP

Features and functions

  Up to 8 independent T1 or E1 ports configurable as either all T1 or all E1 only
  Full-duplex connectivity
  Channelized and fractional T1/E1, clear channel E1 supported
  Up to 256 usable n x 64K, where n is 1 to 24 for T1 and 1 to 32 for E1
  Line-rate performance for all ports channelized to DS-0
  Integrated CSUs and DSUs
  Internal or network clocking selectable on each port
  Per-port, dual-color status LED
  Loopback capabilities:
   Local and remote loopback at the T1 and E1 level
   Response to embedded loopback commands
   Insertion of loopback commands into transmitted signal
   N x DS-0 system-side loopback
  Bit-error-rate-testing (BERT) pattern generation and detection per channel (maximum of 6 T1/E1
at a time)
   Programmable pseudorandom pattern up to 32 bits long, including all 0s, all 1s, 211, 215, 220, 220 Quasi-Random Signal Sequence (QRSS), 223, alternating 0s and 1s, 1-in-8, and 3-in-24
   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

T1-specific features

  Data rate to 1.536 Mbps per port
  Impedance: 100 ohms
  D4 Super Frame (SF) or Extended Super Frame (ESF) framing
  Alternate mark inversion (AMI) or binary 8-zero substitution (B8ZS) line encoding
  ANSI T1.403 and AT&T TR 54016 Facility Data Link (FDL)
  Selectable T1 cable length in increments from 0 to 655 feet
  Selectable T1 CSU line build-out (LBO): 0, -7.5, -15, and -22.5 dB
  Selectable T1 CSU receiver gain: 26 or 36 dB
  Alarm monitoring:
   Alarm indication signal (AIS)
   Out of frame (OOF)
   Far-end alarm failure (yellow or distant alarm)
  Performance data collection:
   CRC and bit errors
   Framing bit errors
   Line errored seconds
   Far-end errored seconds
   Far-end severely errored seconds
   Far-end unavailable seconds
   Line coding violation (LCV)

E1-specific features

  Data rate to 2.048 Mbps (unframed mode) or 1.984 Mbps (framed mode) per port
  Impedance: 120 ohms (RJ-45 to BNC adapter cable offers 75-ohm configuration option)
  Unframed E1, CRC4, or non-CRC4 framing
  High-density bipolar with three zeroes (HDB3) line encoding
  Alarm monitoring:
   Remote alarm indication (RAI)
  Performance data collection:
   CRC and bit errors
   Framing bit errors
   Far-end block error (FEBE)

Reliability and availability

  Single SPA software reset


RFC 1406 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)
  Power 9.4W maximum

Compliance and agency approvals

CE Marking


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


  Part 15
  ICES 003
  CISPR 22
  AS/NZ 3548

Telecom (T1)

  ANSI T1.403

Telecom (E1)

  ITU G.703

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 for ordering information.

Table 2.       Ordering Information

Product Name

Part Number

Cisco 8-Port Channelized T1/E1 Shared Port Adapter Version 2


Cisco 8-Port Channelized T1/E1 Shared Port Adapter Version 2


Adapter Cable - converts 75 ohms to 120 ohms


Service and Support

Cisco offers a wide range of services programs to help accelerate customer success. These innovative services programs are delivered through a unique combination of people, processes, tools, and partners, promoting 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

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

For more information about Cisco Services, refer to Cisco Technical Support Services or Cisco Advanced Services.