Modular Access Multiplexer

• One data port with selectable sync data rates: n x 56 kbps, n x 64 kbps
• Single slot supports the following Megaplex modules: HS-Q/N, HS-S, or HS-U
• Optional sub-E1 drop-and-insert port or PBX connectivity
• Fail-safe sub-E1 ensures uninterrupted service
• Main link available with optional integral LTU or optional fiber optic modem
• Data interfaces: V.35, RS-530, V.36/RS-449 or X.21
• Integrated Ethernet bridge/router option
• Inband remote management
• Dial-in/dial-out for remote out-of-band SNMP management
• 24-hour performance monitoring storage
• Alarm mask and priority configuration for any alarm

• 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 modular access multiplexer serves as a dedicated access multiplexer for business customers, providing integration of voice and data traffic over full E1 or fractional E1 links. It can also be used as an integrating multiplexer. The device has 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) to provide four high or low-speed data channels, four ISDN S or U interfaces. Alternatively, an Ethernet bridge/router port can replace the built-in data port. The FCD-E1M modular access multiplexer also offers an optional sub-E1 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-E1M modular access multiplexer can operate with RAD’s modular DXC multiservice access node products in multilink star applications for access to SDH networks. The DXC and FCD units operate under a centralized SNMP network management.

Flexible timeslot assignment

Timeslot assignment is programmable, allowing data from the data port and from the sub-E1 link to be placed into timeslots consecutively. The FCD-E1M modular access multiplexer also provides 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 link may be clocked from the recovered receive clock, an internal oscillator, one of the data ports, or the sub-E1 link.

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

Meets E1 protocols

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).

Setup, control and monitoring of status and diagnostics can be performed via an ASCII terminal. The FCD-E1M modular access multiplexer can also be managed via any standard SNMP application or the RADview SNMP network management application. Inband management is available via TS0 (E1) or datalink bit (T1), or a dedicated timeslot using standard Frame Relay (RFC 1490), PPP and RIP-2 routing protocols.

The FCD-E1M modular access multiplexer supports 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 in-band loops.

The FCD-E1M modular access multiplexer is available as a 19-inch, 1U-high standalone unit for desktop use. A rack-mount adapter kit enables installation in a 19-inch rack.