Nortel SL-100 Product Manual page 55

Figure 21
Line Group Controller links with other components
The Line Group Controller provides call processing and handling
capabilities, tone circuits and a time switch that can connect individual 64
kbps P-side channels with C-side channels to/from ENET.
The Line Group Controller supports concentration for line interfaces to
make sure that C-side capacity is not wasted (that is, there may be more
P-side channels than C-side channels, in which case the P-side channels
contend for the available C-side channels). Depending on the level of
concentration required, there can be from two to six links between the Line
Group Controller and a Line Concentrating Module. Physically, a Line
Group Controller can support up to 20 P-side ports, giving a theoretical
maximum of 10 LCMs supported using the minimum of two ports on the
Line Concentrating Module. To avoid traffic congestion, however, Line
Groups Controllers are engineered to support a maximum of 16 P-side
ports for up to eight Line Concentrating Modules.
Within the Line Group Controller, voice and data traffic is converted from
serial form (as used for PCM30 and DS-512 channels) into parallel form, to
be conveyed over the Line Group Controller's speech bus. The speech bus
Copyright © 2006, Nortel Networks
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Communication Server 2100
Meridian SL-100 Product Guide
555-4001-103 20.01 Standard
SE09 20 October 2006
Line peripherals 55
Nortel Networks Confidential