the mate LCA over available for DS30 links from the LCM and, therefore, also has a this link. If a fault occurs in one LCA, the mate LCA can take over maximum of 600 (20 X 30) speech links from the LCM. the calls in progress. There are up to 480 (16 X 30) speech links between the Switching Network and the LGC. Between the two LCA, there can be one or more speech links Line concentration can be lessened either by reducing the number (DS30). If all channels on an LCA are busy, but the mate LCA has of Line Concentrating Modules or the number of lines per LCM. free channels, a call originating on the busy LCA can be routed over Remote line modules can provide a limited local switching service one of the inter-LCA speech links to a free channel on the mate should the remote site become isolated from the host. LCA. This capability provides access for all lines to all six DS30 links for traffic engineering purposes. 32.13.2 Digital trunk controller The LGC performs high level functions, such as call coordination and the provision of the different tones required. It is equipped with This is used for 30 channel PCM connections to DMS. The PCM30 duplicated processors operating in hot worker/standby mode. Digital Trunk Controller (PDTC) interfaces up to 16 2Mbit/s carrier DMS Peripheral Modules (PM) 32/21 4 X DS512 Speech link interfaces or equiv. (one located by each crosspoint card) V bus V bus V bus V bus Crosspoint card 0 Even H bus (16k) Shelf 0 Odd H bus (16k) Shelf 1 Shelf 2 Crosspoint card 0 Even H bus (16k) Shelf 3 Odd H bus (16k) Figure 32.13 DMS switch network (E Net) systems via 16 DS30 speech links to the network (i.e. a total of 480 32.13.4 Link Peripheral Processor channels per PDTC). Its two processors operate in hot worker/standby mode. A Link Peripheral Processor (LPP) consists of a number of Link Interface Units (LIU) which are connected to DMS- Bus via a Link Interface Module (LIM). Each LIM consists of a pair of Local 32.13.3 Trunk Module Message Switches each serving a maximum of 36 LIU. An LIU configu