E1/T1 Modular Access Multiplexer

RAD's FCD-E1M and FCD-T1M modular access multiplexers provide small business customers with voice and data traffic integration over E1/T1 or Fractional E1/T1 links. They can also be used as integrating multiplexers.

The FCD-E1M and FCD-T1M modular access multiplexers work in conjunction with the Megaplex-2100 and DXC family of products, forming multilink star architectures for access to SDH/SONET networks, supplying a complete solution for delivery of bundled services.

• Provides a modular solution for data/voice integration

• Operates with RAD's Megaplex-2100 and DXC multiservice access node for multilink star configuration

Dedicated access multiplexer

The FCD-E1M and FCD-T1M serve as dedicated access multiplexers for business customers, providing integration of voice and data traffic over full E1/T1 or fractional E1/T1 links. They can also be used as integrating multiplexers. The devices have a single n x 56/64 kbps data port and an I/O module slot supporting one Megaplex I/O module (HS-Q/N, HS-S, HS-U, HS-R or VC-6) to provide four high or low speed data channels, four ISDN S or U interfaces, or six analog voice channels. Alternatively, an Ethernet bridge/router port can replace the built-in data port. The FCD-E1M and FCD-T1M modular access multiplexers also offer an optional sub-E1/T1 drop-and-insert port for PBX connectivity.

The FCD-E1M modular access multiplexer can be ordered with an internal LTU (line termination unit), allowing direct connection to the E1 network, or can connect via an external LTU. The FCD-T1M modular access multiplexer has an integral CSU, allowing direct connection to the T1 network. Optionally, either unit can support a fiber optic main link interface for multimode or single mode fiber, eliminating the need for an external fiber optic modem.

The FCD-E1M and FCD-T1M modular access multiplexers can operate with RAD’s modular DXC multiservice access node products in multilink star applications for access to SDH/SONET networks. The DXC and FCD units operate under a centralized SNMP network management.

Timeslot assignment is programmable, allowing data from the data port and from the sub-E1/T1 link to be placed into timeslots consecutively. FCD-E1M and FCD-T1M modular access multiplexer also provide additional flexibility by giving full user control over the data port timeslot allocation.

Multiple clock source selection ensures maximum flexibility for supporting different applications. The main E1/T1 link may be clocked from the recovered receive clock, an internal oscillator, one of the data ports, or the sub-E1/T1 link.

Immunity to hardware and power failures is provided by bypassing the sub-E1/T1 port to the main E1/T1 link, ensuring uninterrupted service to the sub-E1/T1 port.

The E1 interface meets all requirements of ITU recommendations G.703, G.704, G.706 and G.732. It supports both two and 16 frames per multiframe, with or without CRC-4. Zero suppression over the line is HDB3. The integral LTU ensures a range of up to 2 km (1.2 miles).

The T1 interface meets all requirements of TR-62411 and TR-62421. It supports both D4 and ESF frame formats. Zero suppression over the line is selectable for either transparent, B7ZS or B8ZS. The integral CSU ensures a range of up to 1.6 km (1 mile).

Setup, control and monitoring of status and diagnostics can be performed via an ASCII terminal. The FCD-E1M and FCD-T1M modular access multiplexers can also be managed via any standard SNMP application or the RADview SNMP network management application. In-band management is available via TS0 (E1) or datalink bit (T1), or a dedicated timeslot using standard Frame Relay (RFC 1490), PPP and RIP II routing protocols.

The FCD-E1M and FCD-T1M modular access multiplexers support dial-in/dial-out, which can also be used for remote out-of-band configuration and monitoring, via serial V.24, SLIP, PPP or Ethernet ports. Enhanced diagnostics include user-activated local and remote loopbacks, an integrated BER tester and fractional E1/T1 in-band loops.

The FCD-E1M and FCD-T1M modular access multiplexers are available as 19", 1U-high, standalone units for desktop use. A rack-mount adapter kit enables installation in a 19" rack.