Cisco SM-X-2MFT-T1/E1 Full Official Technical Specification Document

1. Product Overview

Official Full Designation

Core Definition

• T1 Mode: ANSI T1.403, 1.544 Mbps, 24 × 64 kbps DS0 timeslots
• E1 Mode: ITU-T G.703/G.704, 2.048 Mbps, 32 × 64 kbps DS0 timeslots (TS0 reserved for framing synchronization)

SKU Naming Breakdown

1. SM-X: Service Module X, single-wide enhanced expansion form factor exclusive to Cisco ISR 4000 Series routers, with high-speed Multigigabit Fabric (MGF) backplane bus and native OIR hot-swap support
2. 2: Two independent physical balanced trunk ports integrated on one SM-X module
3. MFT: Multiflex Trunk, flexible arbitrary DS0 timeslot partitioning enabling simultaneous mixed voice and data services on each T1/E1 trunk span
4. T1/E1: Universal dual-standard trunk support; each RJ48 port software-selectable between ANSI T1 (North American PSTN trunk) and ITU-T E1 (global/European trunk) operation without hardware modification
5. =: Standard spare part suffix for standalone replacement kits (SM-X-2MFT-T1/E1=)
6. -RF: Certified refurbished spare SKU variant (SM-X-2MFT-T1/E1-RF)

Product Lifecycle Notice

• Official Global Release Year: 2014
• End-of-Sale (EoS) Status: Discontinued; Cisco permanently ceased production of brand-new SM-X-2MFT-T1/E1 hardware units
• Direct Upgrade Replacement Model: NIM-2MFT-T1/E1 dual-port multiflex trunk NIM modules for Catalyst 8000 Series edge platforms
• Minimum Supported IOS XE Software Version: Cisco IOS XE 3.12S / IOS 15.4(2)T; all subsequent IOS XE 3.x, 16.x, 17.x release trains fully support all module features
• Software Maintenance Status: Only critical security vulnerability patches are released for customers holding active Cisco DNA Services contracts; no new feature enhancements will be developed
• Legacy Status: End-of-sale legacy hardware; certified refurbished spare modules, validated IOS XE firmware images and 24×7 Cisco TAC engineering technical support remain available through authorized Cisco distribution partners

Supported Router Platform Compatibility

1. Cisco ISR 4300 Series: 4321, 4331, 4351
2. Cisco ISR 4400 Series: 4431, 4451, 4461

Deployment Restrictions

1. OIR operational requirement: Online Insertion and Removal hot-swap functionality is fully functional only when the router runs the minimum required IOS XE release; older IOS versions require a full chassis power cycle for module replacement.
2. Shared clock domain constraint: For hardware Drop-and-Insert TDM cross-connect operation, both trunk ports must be configured with identical framing, line coding and clocking parameters; mismatched trunk layer settings will disable D&I timeslot bridging.
3. DSP hardware dependency for voice services: Packet voice PRI trunking, VoIP codec processing and echo cancellation functions require PVDM3 DSP modules mounted on the router motherboard; standalone SM-X-2MFT-T1/E1 only supports pure fractional T1/E1 data connectivity without voice processing resources.
4. Backplane bandwidth ceiling: The SM-X slot provides a maximum 10 Gbps full-duplex MGF backplane link to the router’s route processor; aggregate sustained TDM + IP traffic exceeding backplane capacity will trigger packet drop and congestion events.
5. Balanced trunk cable limitation: RJ48 ports require standard balanced twisted-pair trunk cabling for T1/E1 signal transmission; standard RJ45 Ethernet patch cables do not meet impedance requirements and will cause trunk signal errors.

Standard Factory Complete Bundle Contents

1. SM-X-2MFT-T1/E1 dual-port universal T1/E1 multiflex trunk SM-X service module with two front-panel RJ48 balanced trunk ports and dedicated per-port carrier detect/alarm status LED indicators
2. Anti-static ESD handling storage bag and protective foam packaging
3. Quick-start hardware installation guide covering ESD static protection protocols, SM-X slot OIR insertion/removal procedures, balanced RJ48 trunk cabling specifications, IOS XE T1/E1 port mode switching configuration, DS0 timeslot partitioning, Drop-and-Insert TDM cross-connect setup and basic IOS XE fractional trunk data / PRI voice configuration command examples
4. Global regulatory compliance, safety, and electromagnetic interference (EMI) certification documentation packet

Core Integrated Functional Capabilities

1. Dual Fully Independent Universal Software-Configurable T1/E1 Trunk Ports: Two isolated physical RJ48 balanced trunk ports; each port can be toggled via IOS XE command line between ANSI T1 (1.544 Mbps, 24 DS0) and ITU-T E1 (2.048 Mbps, 32 DS0) operation, eliminating separate T1-only and E1-only hardware inventory for global multi-region enterprise branch deployments.
2. Per-Port Independent Integrated Managed CSU/DSU Hardware: Each trunk port features fully self-contained line termination CSU/DSU logic built into the SM-X module hardware, removing the requirement for costly standalone external channel service unit devices at remote branch sites, simplifying rack cabling layouts and enabling centralized IOS XE remote trunk line diagnostics and loopback troubleshooting without dispatching on-site field technicians.
3. Native Hardware Drop-and-Insert (D&I) TDM Cross-Connect: Embedded dedicated onboard TDM switching logic enables DS0 timeslot bridging between the two trunk ports natively on the SM-X module hardware. Network operators eliminate expensive standalone third-party TDM drop-and-insert multiplexers for PBX trunk bypass, carrier circuit consolidation and inter-site voice circuit bridging use cases.
4. Fully Independent Per-Port DS0 Timeslot Partitioning: Administrators can split the full set of trunk DS0 timeslots into multiple independent groups via IOS XE configuration: fractional T1/E1 channel-groups for HDLC/PPP/Frame Relay leased-line data links, and pri-groups for T1/E1 PRI ISDN packet voice trunking to on-site PBX and carrier PSTN central office switches. Each port supports a maximum of two independent fractional data channel-groups.
5. Comprehensive T1/E1 Trunk Line Diagnostic and Loopback Toolset Per Port: Native support for all standard T1/E1 framing, line coding, local/remote line loopback activation, BERT bit error rate testing, and real-time trunk alarm monitoring (Loss of Signal, Out of Frame, Alarm Indication Signal, Remote Alarm Indication).
6. Motherboard PVDM3 High-Performance Echo Cancellation Compatibility: Seamless integration with router motherboard PVDM3 DSP modules to deliver industry-standard high-performance echo cancellation up to 128ms echo tail length for challenging long-loop PSTN voice trunk deployments.
7. Full Multi-Transport Converged Voice Protocol Support: Compatible with all standard enterprise packet voice transport technologies: Voice over ATM (VoATM) AAL2/AAL5, Voice over IP (VoIP) SIP/H.323/MGCP, Voice over Frame Relay (VoFR), RSVP QoS bandwidth reservation.
8. Full Native IOS XE Feature Compatibility: Natively integrated with the complete Cisco IOS XE feature suite, including Cisco Unified SRST, Cisco CME, static/dynamic IP routing (RIP, EIGRP, OSPF), zone-based IOS firewall, NAT/PAT address translation, IPSec site-to-site VPN tunneling, AAA identity authentication, differentiated services QoS traffic prioritization and SNMP remote network monitoring.
9. SNMP MIB Remote Monitoring Support: Implements standard Cisco T1/E1 trunk interface SNMP MIBs for remote network monitoring of SM-X module hardware operational status, trunk carrier/alarm status, aggregate ingress/egress TDM/IP traffic throughput, DS0 timeslot utilization counters, trunk bit error statistics and hardware fault alarm reporting.

2. Hardware & Performance Specifications

Core Dual-Port Universal T1/E1 Trunk Transmission Performance

• Configurable Trunk Standards (per individual RJ48 port):
  1. T1 Mode: ANSI T1.403, total line rate 1.544 Mbps; 24 × 64 kbps DS0 payload timeslots
  2. E1 Mode: ITU-T G.703 physical layer, G.704 channelized framing, total line rate 2.048 Mbps; 32 × 64 kbps DS0 timeslots (TS0 reserved for framing synchronization)
• Supported Framing Types:
  • T1: Super Frame (SF), Extended Super Frame (ESF)
  • E1: Non-CRC4 basic framing, CRC4 double-frame standard framing
• Supported Line Coding Formats:
  • T1: AMI, B8ZS binary eight-zero substitution
  • E1: HDB3 high-density bipolar three-zero substitution
• Physical Port Connectors: Dual independent RJ48 female front-panel balanced twisted-pair trunk ports for connection to carrier CO or PBX trunk equipment
• Integrated CSU/DSU Core Functions (per port): Line clock recovery, loss-of-signal detection, AIS/RAI alarm generation, remote loopback activation, real-time BERT bit error rate counter tracking
• Maximum Independent Data Channel-Groups: 2 separate fractional T1/E1 serial data channel-groups per trunk port
• Supported Data Link Encapsulations for Fractional Trunk Channels: HDLC, PPP, Frame Relay

Front Panel LED Indicator Definitions (Per Individual T1/E1 Port)

1. CARRIER LED: Solid green = Valid synchronized T1/E1 physical layer link established with remote carrier/PBX equipment; off = No trunk signal detected or loss-of-signal alarm active
2. ALARM LED: Solid amber = Active trunk layer fault alarm (OOF, AIS, RAI, excessive bit error rate); off = No active trunk fault conditions

Electrical & Thermal Specifications

Power Consumption

• Typical operating power draw under dual-port idle trunk standby mode: ~13 Watts
• Maximum full-load power consumption under dual-port full DS0 concurrent voice + data traffic plus active Drop-and-Insert TDM cross-connect: ~19 Watts
• Power Delivery: Powered exclusively through the ISR 4000 router chassis SM-X slot internal MGF backplane bus; no external power supply connectors mounted on the SM-X module hardware

Thermal & Environmental Operating Parameters

• Certified Continuous Operating Temperature Range: 0°C to 40°C (32°F to 104°F) standard enterprise branch datacenter equipment room environment
• Extended Validated Short-Term Operating Temperature: 0°C to 55°C (32°F to 131°F)
• Storage & Transport Temperature Range: -40°C to 70°C (-40°F to 158°F)
• Operating Relative Humidity: 5% to 85% RH, non-condensing
• Storage Relative Humidity: 5% to 95% RH, non-condensing
• Operating Altitude: Certified operational range -150 m to 2,000 m (-500 ft to 6,500 ft); extended validated range up to 3,000 m (10,000 ft)
• Cooling Design: Fanless passive heat dissipation architecture with integrated aluminum heat sink, no onboard cooling fans; cooling airflow supplied by the host ISR 4000 router’s internal chassis fan assembly
• Airflow Direction: Horizontal chassis airflow passing over the SM-X module passive heat sink for thermal dissipation

Physical Form Factor & Weight

• Form Factor: Standard single-wide SM-X service module expansion card form factor, designed exclusively for SM-X dedicated expansion slots of Cisco ISR 4000 Series routers
• Bare SM-X Module Net Weight (without balanced trunk twisted-pair cables and accessory packaging): Approximately 780 grams
• Physical Dimensions (H x W x D): 1.25 × 3.50 × 7.24 inches (32 × 89 × 184 mm)

3. Regulatory & Compliance Certifications

1. Safety Standards: UL 60950-1, CSA C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, GB 4943 Chinese national safety standard
2. EMC & EMI Standards: FCC CFR Title 47 Part 15 Class A, VCCI Class A ITE, EN55022 Class A, CISPR 22 Class A, ICES-003 Class A, CISPR 24, EN 61000 series electromagnetic immunity standards
3. Trunk Telecommunications Compliance: FCC Part 68, ANSI T1.403, ITU-T G.703/G.704, ETSI TBR21 global T1/E1 trunk loop interface certification standards
4. Environmental Directive: EU RoHS hazardous substance restriction compliance

4. Core Deployment Advantages

1. Dual High-Density Universal T1/E1 Port Design Maximizes Router SM-X Slot Utilization: Two fully isolated universal T1/E1 trunk interfaces integrated within a single SM-X expansion slot, eliminating the need to deploy two separate single-port SM-X MFT modules for dual-circuit T1/E1 deployments. This design drastically conserves limited ISR 4000 chassis SM-X slot resources and reduces overall hardware capital expenditure for dual-leased-line and multi-PBX trunk branch network deployments.
2. Universal Software-Switchable T1/E1 Single Hardware Flexibility: The flagship universal dual-trunk design allows network operators to deploy a single hardware model globally, software-switching each port independently between North American T1 and European/global E1 trunk modes via IOS XE without purchasing separate dedicated T1-only and E1-only interface cards, drastically simplifying hardware inventory management and reducing spare part stocking costs for multi-region enterprise networks.
3. Third-Generation Upgraded Hardware Architecture vs Legacy VWIC/VWIC2/VWIC3 Generations: Delivers multiple critical performance and feature enhancements over older multiflex trunk cards for legacy routers: native Drop-and-Insert multiplexing built into the SM-X module hardware, independent per-port integrated CSU/DSU eliminating external line termination hardware, OIR hot-swap maintenance support, optimized MGF backplane bus throughput for high-density converged voice-data dual-trunk workloads, and seamless integration with modern IOS XE SD-WAN and unified voice feature suites.
4. Per-Port Integrated CSU/DSU Eliminates External Auxiliary Hardware: Each trunk port features fully self-contained line termination CSU/DSU logic, removing the need for costly standalone external channel service unit devices at remote branch sites. This reduces branch rack equipment footprint, simplifies balanced twisted-pair trunk cabling layouts, and enables centralized IOS XE remote trunk line diagnostics and loopback troubleshooting without dispatching on-site field technicians.
5. Onboard Hardware Drop-and-Insert TDM Cross-Connect Eliminates External Multiplexers: Embedded dedicated TDM switching hardware enables DS0 timeslot bridging between the two trunk circuits natively on the SM-X module hardware. Network operators eliminate expensive standalone third-party TDM drop-and-insert multiplexers for PBX trunk bypass, carrier circuit consolidation and inter-site voice circuit bridging use cases, further cutting branch auxiliary hardware capital expenditure.
6. Flexible Converged Multiflex Voice-and-Data Timeslot Partitioning Per Port: The multiflex trunk architecture enables fully arbitrary division of all trunk DS0 timeslots between fractional serial WAN data channel-groups and PRI packet voice trunk pri-groups on each physical trunk circuit. Enterprises avoid purchasing separate dedicated trunk lines for data internet/leased-line traffic and separate PRI trunks for PBX telephony services, drastically reducing monthly recurring carrier trunk line subscription costs for remote branch locations.
7. Unified IOS XE Feature Suite Compatibility for All Voice and Data Workloads: The SM-X-2MFT-T1/E1 dual-port universal T1/E1 trunk interface seamlessly integrates with the complete portfolio of core Cisco IOS XE enterprise edge features: IP routing, stateful zone-based firewall, NAT/PAT, IPSec VPN tunneling, differentiated services QoS, ACL security filtering, AAA user authentication, unified voice SRST/CME and encrypted remote network management. All fractional trunk WAN data and T1/E1 PRI VoIP voice trunk configurations are managed through a single consistent IOS XE command-line interface, eliminating disjointed separate management systems for data network and PBX telephony infrastructure at branch locations.
8. Fanless Passive Heat Sink High-Reliability Low-Maintenance Architecture: The SM-X-2MFT-T1/E1 module utilizes a fanless integrated aluminum passive heat sink cooling design with zero moving mechanical fan components. This eliminates mechanical hardware failure risks associated with rotating cooling fans, enabling stable 24/7 continuous unattended operation in remote unmanned enterprise branch datacenter equipment closets with minimal long-term on-site maintenance requirements. Low idle and full-load power consumption reduces overall router chassis energy draw and enterprise branch site cooling operational energy costs.

Supplementary Product Specification Notes

UNSPSC Classification Code

K9 Security Compliance Note

Factory Hardware Warranty Terms