E1/T1 or Fractional E1/T1 Access Units

• Simple to operate

• Fast access rates

• Integrated Ethernet bridge/router option, enabling LAN extension 

• Multiple services transmitted from a single source

• Management timeslots – allows management of all FCD-IP chain via single DTS

• Default startup configuration simplifies installation

Access units for full or fractional E1/T1 services The FCD-E1 and FCD-T1 access units enable E1/T1 full or Fractional services. They can be ordered with either one or two data ports and with an optional sub-E1/T1 drop-and-insert port. The data port rates are selectable for any multiple of 56 kbps or 64 kbps, up to 1,984 kbps. Alternatively, one of the data ports can be replaced by an Ethernet bridge, providing direct connection to the LAN. In the FCD-E1A model, one of the data ports can also be replaced by four S0 interfaces for ISDN BRI extension, or by an ISDN backup interface.

The FCD-E1 access unit is available with or without an internal LTU (line termination unit), allowing direct connection to the E1 network or connection via an external LTU. The FCD-E1A access unit has this capability built-in and can be configured with or without LTU by the customer. The FCD-T1 access unit has a built-in CSU, allowing direct connection to the T1 network.

The FCD-E1, FCD-T1 and FCD-E1A access units can operate with RAD's modular DXC multiservice access node products for multilink star applications, including access to SDH/SONET networks. The DXC units and these FCD devices operate under centralized SNMP network management.

Timeslot assignment is programmable, allowing data from each data port and from the sub-E1/T1 port to be placed into timeslots on the main link, either consecutively or alternately. The FCD-E1, FCD-T1 and FCD-E1A access units also allow flexible timeslot allocation of the data port timeslots. Each timeslot of the sub-E1/T1 port is placed on the same timeslot of the main E1/T1 link.

Multiple clock source selection ensures maximum flexibility, both for the main link and for the data ports, enabling the support of different applications.

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 diagnostic information can be activated in four ways: 

• Front panel LCD with pushbuttons (menudriven management)

• ASCII terminal connected to the async control port (command line interpreter)

• SNMP management connected to the async control port

• In-band management through a datalink bit (T1), a dedicated timeslot or TS0 (E1), supporting proprietary protocol and Frame Relay RFC 1490 

The FCD-E1, FCD-T1 and FCD-E1A access units support an internal SNMP agent and can be controlled by any generic SNMP station or by the RADview-HPOV/TDM, or RADview-PC/TDM (FCD-E1A only) SNMP network management application.

The FCD-E1, FCD-T1 and FCD-E1A access units support dial-in/dial-out, which can be used for remote out-of-band configuration and monitoring (dial-in) and for alarms (dial-out).

Maintenance capabilities include useractivated local and remote loopbacks and internal BERTs on the main E1/T1 link, sub-E1/T1 link and data ports. The FCD-T1 also responds to network-activated loops (RLB, LLB) when configured as a CSU.

The FCD-E1, FCD-T1 and FCD-E1A access units are available as standalone units for the desktop or a 19" rack shelf.