E1 or Fractional E1 Access Unit

RAD's FCD-2L E1 or Fractional E1 access unit is an economical single port access unit for E1 or Fractional E1 services. The unit can also be used as a rate or interface converter between the user data interface port and the E1 line. Alternatively, an Ethernet bridge, providing direct connection to the LAN, can replace the data port. The FCD-2L E1 or Fractional E1 access unit can be equipped with or without a Line Termination Unit (LTU).

• Low cost E1/Fractional E1 access unit

• Built-in line driver extends service reach to two kilometers

• Can serve as a rate or interface converter

The FCD-2L E1 or Fractional E1 access unit is a single port access unit for full or fractional E1 services. Data port rates are selectable for any multiple of 56 kbps or 64 kbps up to 1,984 kbps. Alternatively, the data port can be replaced by an Ethernet bridge, providing direct connection to the LAN. User data is placed into the E1 frame, using only the required number of timeslots. Timeslot assignment is according to the data port speed and is consecutive, starting from any timeslot. The FCD-2L E1 or Fractional E1 access unit can be ordered with or without an LTU (line termination unit). The integral LTU ensures a range of up to 2 km (1.2 miles).

 

The FCD-2L E1 or Fractional E1 access unit meets all requirements of ITU for G.703, G.704, G.706, G.732 and G.823. It supports both two and 16 frames per multiframe, with or without CRC-4. Zero suppression over the line is HDB3. The unit may be clocked from the recovered receive clock (LBT) of the main E1 link or from an internal oscillator. The data channel interface is RS-530. Adapter cables are available for V.35, V.36/RS-422 or X.21.

 

The unit also supports an optional UTP bridge port.

 

FCD-2L setup and control is by internal jumpers. Front panel switches control all diagnostic options.

 

Diagnostics include user activated local loopbacks on the main E1 link and DCE data port. A pseudo-random data pattern (BERT) can be used to check the transmission path and the local and remote units. The FCD-2L can display major and minor alarms, and indicate bit error rate on the E1 line in excess of 1 x 10ֿ3.

 

The FCD-2L E1 or Fractional E1 access unit is available as a standalone unit or as a card for a 19" rack. An adapter kit enables installation of one or two standalone units in a 19" rack.