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Extra info for All in One Cisco CCIE Lab Study Guide Second Edition
Out−of−Band Network Management Figure 2−1 depicts a remote site that does not use a terminal server to access the routers on the network. Therefore, each router requires a separate modem connection in order to manage the device out−of−band. Figure 2−1: Out−of−band network management without a terminal server In Figure 2−2, all devices are accessed through the terminal server. Notice that only one analog line and one modem are needed to manage all of the local devices. Not only does this simplify network management, it also greatly reduces the cost.
Many of the Cisco routers with built−in ISDN interfaces have an ST interface. In order to convert the U interface circuit from the carrier to an ST interface circuit that the router can handle, an external NT1 (network terminating unit) is needed. This is depicted in Figure 3−5. An ISDN circuit is usually delivered by the Telco on an 8−pin RJ−45 jack. 16 Figure 3−5: ISDN BRI U and ST interfaces ISDN PRI An ISDN PRI (Primary Rate Interface) is delivered on a T1 circuit. As shown in Figure 3−6, a PRI consists of 23 data channels (bearer channels) running at 56K or 64K each.
Figure 3−11 shows how a call is placed. As seen in Figure 3−11, some of the signaling is local — between the router and the ISDN switch on either side of the circuit — while other signaling flows end to end between both routers. 22 Figure 3−11: ISDN Layer 3 call control The following traces show a call setup and disconnect sequence between RouterA and RouterB (reference Figure 3−11 for a frame−by−frame explanation). Setup Message from Router to Switch RouterA sends a Setup message to the RouterB.