Lucent Technologies SLC ConnectReach User & Service Manual page 48

Product Description
Physical and Functional Description
Interfaces (Continued)
Emulated channel
units (continued)
Voice interfaces
* Trademark of VINA Technologies, Inc.
2-6 Issue 4 June 2002
SPQ456 Channel Unit (Direct Inward Dialing/Current Sink)
The SPQ456 channel unit is a quad direct inward dialing (DID) channel unit that is
used to provide capability for applications such as DID and local call routing
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(LCR ). The SPQ456 channel unit supports loop reverse battery signaling and D4
signaling format is used for the A/B/C/D signaling bits. The SPQ456 channel unit
is emulated by the foreign exchange office (FXO) circuit card and is used for
analog voice channels and secondary/fractional-T1 voice lines in the SLC
ConnectReach system.
The SPQ456 channel unit is normally provisioned by means of software for a loss
of either 0 or 2.5 dB. However, in the SLC ConnectReach system, provisioning
messages will determine the setting and the 2.5-dB loss option will be mapped to
the SLC ConnectReach system option of 3.0 dB of loss.
The SLC ConnectReach system emulates three different types of voice channel
units: SPQ440(C,D), SPQ443, and SPQ456. The SPQ443 channel unit will be
used to interface with the DS0 signals that the SLC ConnectReach system is
mapping from the network T1/DSX-1 line to the secondary T1/DSX-1 line for
connection to a private branch exchange (PBX) or key system.
Voice hardware that can be installed in the SLC ConnectReach system is
comprised of four different types of circuit boards: four-line (quad) current feed,
eight-line current feed, quad current sink, and eight-line current sink. Current feed
boards provide service to current feed lines typically connected to analog
telephones or analog ports on a PBX or key system. Both loop-start and
ground-start signaling are supported on current feed lines. Current sink boards
provide service to current sink lines that typically connect to a CO over an analog
line for LCR applications or to a PBX analog direct inward dialing (DID)-dial pulse
terminating (DPT) interface. Only loop reverse battery signaling is supported in
the DID-DPT channel units.
The assignment of specific channel units must be coordinated with the installation
of voice hardware so that the assigned channel units match the voice hardware.
For example, if a range of analog voice channels (analog-begin and analog-end
DS0 range) is configured for SPQ
must be installed to serve these channels is an FXS. Whereas, if a range of
analog voice channels is configured for SPQ
board that must be installed to serve these channels is an FXO.
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440, then the corresponding circuit board that
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456, then the corresponding circuit
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363-208-050
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