T1 or Fractional T1 CSU/DSU

The FCD-1L T1 or Fractional T1 access unit is an economical single port access unit for T1 or Fractional T1 services. The unit can also be used as a rate or interface converter between the user data interface port and the T1 line. The FCD-1L T1 or Fractional T1 access unit can be equipped with or without a CSU. When equipped with a CSU, the transmission range can be extended to 1.2 miles.

• Economical access device for T1 and Fractional T1 services

• Can serve as a rate or interface converter

• Built-in CSU extends service offering over one mile

The FCD-1L T1 or Fractional T1 access unit is a single port access unit for full or Fractional T1 services. Data port rates are selectable for any multiple of 56 kbps or 64 kbps up to 1,536 kbps. User data is placed into a T1 frame, using only the required number of timeslots. Timeslot assignment is performed according to the data port speed and is consecutive, starting from any timeslot.

 

The FCD-1L T1 or Fractional T1 access unit can be ordered with or without a CSU. The integral CSU ensures a range of up to 2 kilometers (1.2 miles).

 

The FCD-1L T1 or Fractional T1 access unit meets all the requirements of TR-62411 and TR-62421. The unit supports both D4 and ESF framing formats. Zero suppression over the line is selectable for B7ZS or B8ZS.

 

The main T1 link may be clocked from the recovered receive clock (LBT) 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.

 

FCD-1L T1 or Fractional T1 access unit setup and control is by internal jumpers. Front panel switches control all diagnostic options.

 

Diagnostics include user-activated local loopbacks on the main T1 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-1L can display major and minor alarms, and indicate bit error rate on the T1 line in excess of 1 x 10-3.

 

The FCD-1L T1 or Fractional T1 access unit is available as a standalone unit or as a card in a 19" rack. An adapter kit enables installation of one or two standalone units in a 19" rack.