SPA-2XT3/E3 is a Cisco Router Shared Port Adapter. This Cisco Clear Channel T3/E3 SPAs are 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. They are available in 2- and 4-port options. The ports are configurable as either all T3 or all E3.



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SKU: CISCO SPA-2XT3/E3 Category:


Sub Brands



Product compatibility • Cisco 7304 Router

• Cisco 7600 Series Routers

• Cisco 12000 Series Routers

• Cisco ASR 9000 Series Router

• Cisco XR 12000 Series Routers

Port density per SPA 2- and 4-port options
Physical Interface • 1.0/2.3 RF connector (75-ohm impedance)

• 1.0/2.3 RF to BNC adapter cable option

Protocols Serial encapsulations:


•  PPP, RFC 1662

•  Frame Relay, RFC 1490

Features and functions • Up to 4 independent T3 or E3 ports configurable as either all T3 or all E3 only

• 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 QuasiRandom

Signal Sequence (QRSS), 223, 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

• Compliant 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 G.703 framing

• High-density bipolar with three zeroes (HDB3) line coding

• Compliant 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 •  OIR

•  Single SPA software reset

MIBs 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)

Power •  2-port: 7.7W maximum

•  4-port: 8.4W maximum

Compliance and agency approvals CE Marking


• UL 60950

• CSA 22.2 No.60950

• IEC 60950

• EN 60950

• AS/NZS 3260

• TS001


• CFR47 Part 15

• ICES 003

• EN55022

• CISPR 22

• AS/NZ 3548


• EN55024

• EN50082-1

• EN61000-6-1

Telecom (T3)

• ANSI T1 107

• T1 404

• AT&T 54014

Telecom (E3)

• G.703

• G.751

• G.832

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


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