- The
120A channel service unit (CSU) module connects to either a TN464E/F
or a TN767D/E DS1 circuit pack on 1 end. The other end connects
to the network interface smart jack. The 120A is powered from
the +5 VDC port carrier power supply and uses a maximum of 1.2
Watts.
- In
combination with the DS1 circuit pack, it provides the essential
functions of external CSUs. The TN464/767 and switch administration
support all framing and line coding options.
- The
120A is small, a little larger than a wallet, is easier to install
than an external CSU, and does not require any option switch settings
or DS1 cable.
- Vintage
2 of the 120A CSU module (the 120A2) provides enhancements to
support the payload loopback function available when the ESF framing
format is selected.
- This
700A loopback jack is controlled from the network side using the
data link provided by the ESF framing format. This provides a
loopback of data back to the network and operates as defined in
AT&T TR54016-1989.
- Includes
Clip and Cable.
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