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LBI-39224
3-77
– Digital voice/data using subrate ports mode (currently not
supported)
– Digital voice/data using T1/E1 mode (currently not
supported)
Line Type
This is a read-only field which indicates which type of line (T1 or E1)
that the system is configured for.
Frame Format
Framing deals with how the digitized data stream is configured
(formatted), a data stream with one framing format would not be
recognized by a system with another frame format. The possible T1
formats are 4-Frame Multiframe (F4), 12-Frame Multiframe (F12,
D3/4), Extended Superframe (ESF), and Remote Switch Mode (F72).
The possible E1 formats are Doubleframe and CRC Multiframe. The
format is determined by the service line used. Select from the available
choices in the drop-down list box to match the line format.
Line Code
The line code indicates the method used to encode long strings of
zeroes. The receiving end of a T1/E1 link would not be able to remain
in sync if long strings of zeroes were transmitted. The possible T1 line
codes are B8ZS and AMI w/ZCS. The E1 line code is HDB3. The line
code also is determined by the service line utilized. Select from the
available choices in the drop-down list box to match the line.
Signaling Type
This signaling is used by the T1/E1 Interface Card to transmit channel
status information (busy or idle). T1 uses bits robbed from the channel
data to convey this information. E1 uses a dedicated channel to send
signaling information for all channels; therefore only 30 user channels
are allowed. In a CEC/IMC system, signaling must be set for MIM site
interfaces, and the T1/E1 muxes and base stations at the associated site
location must be configured for E&M Signaling unless the site is all
digital (no analog voice). Signaling should not be set for any other
device types. The types of signaling are No Signaling (both T1 and
E1), CAS-BR for T1, and CAS-CC for E1. Select the signaling type
from the drop-down list box.
Line Length
This is the distance between the CEC/IMC and the device at the other
end of the T1 line, which could be a microwave transceiver, a mux in
co-located site equipment, CSU, etc. Line effects change the signal