BLACK BOX MT14230A-SM-SC 4-Port T1E1, 1-Port 10/100 Ethernet Multiplexor with Fiber Extension – Single-Mode, 30-km, Dual SC

SKU: 4289 Category:



In a typical enterprise application, the BLACK BOX MT14230A-SM-SC T1/E1 Fiber Multiplexer uses optical media to aggregate and extend four T1 or E1 channels from a local PBX to four T1/E1 connections at a remote PBX.  Use theBLACK BOX MT14230A-SM-SC T1/E1 Fiber Multiplexer also for mobile backhaul applications where you want a cost-effective, multiservice platform that's capable of delivering Ethernet and TDM services over a fiber link. Extend four T1 lines from your TDM network and an Ethernet connection from the IP network to a cell site, for instance.

With fiber optics, your T1/E1 and Ethernet communications also receive the benefits of security, immunity against EMI and RFI, and protection against the harmful effects of ground loops.  The BLACK BOX MT14230A-SM-SC T1/E1 Fiber Multiplexer offer simple installation and use. DIP switches are used to configure the units for T1/E1 line operation and enabling port alarm relays. For troubleshooting, the BLACK BOX MT14230A-SM-SC T1/E1 Fiber Multiplexer offers local loopback on both the copper and fiber ports, as well as remote fiber loopback and circuit test pattern modes – minimizing the need for testing functions at both ends of the link.

Additional information

Weight 5.00 lbs
Dimensions 9.00 × 6.00 × 4.00 in


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  • Aggregates four independent T1/E1 channels onto a fiber optic segment for distance
  • Order a second unit for the remote conversion back to T1/E1 lines.
  • Duplex single-mode fiber port supports leased line extensions up to 30 kilometers (18.6 mi.).
  • It also has an integrated 10BASE-T/100BASE-TX copper LAN port for Ethernet connections.
  • Ideal for extending T1 and Ethernet communications over fiber to a remote PBX and other equipment.
  • Local loopback on both the copper and fiber ports.
  • It also offers remote fiber loopback and circuit test modes.
  • Configurable alarm relay contacts enable you to set up audio/visual fault notification.
  • Get extra distance for your T1/E1 and 10-/100-Mbps Ethernet communications with a pair of T1/E1 to Fiber Muxes.
  • Unlike ordinary fiber-based T1 extenders, the four-port muxes eliminate the requirement that each channel have its own fiber link.


CE Approval                          Yes

MTBF                                    150,000

Power                                   100-240 VAC, 50-60Hz, Autosensing

Protocol                                 ANS: T1.403, T1.102, AT&T: T62411, ITU: G.703, G.704,                                                        G.706, G.736, G.775, G.823, G.824, G.8261, ETSI: ETS 300                                                166
                                              Ethernet: 10BASE-T, 100BASE-TX, 100BASE-FX (with a                                                      maximum frame size of 2044 bytes)

RoHS                                     Yes


Item Specifications

Connectors:                          T1/E1: (4) RJ-48; (1) RJ-45 (10BASE-T/100BASE-TX); Fiber                                                 Optic: (1) Pair of Multi-mode

Dimensions                          1,9” Height x 6.7” Width x 5.5” Depth

Indicators                              LEDs: Power, Test, RJ-48 Link, Fiber Optic Link

Weight                                  2.5 Pounds

BLACK BOX / MT14230A-SM-SC     4-Port T1/E1 & 1-Port 10/100 Fiber Multiplxer