26 Overviewtolerance, the MGC is equipped with a clock reference input/output. Theclock reference input and output connections and cable detect are providedthrough a 15-pin DSUB connector.MGC Serial PortsEach MGC installed in a CS 1000B provides the opportunity for 3 remoteSDIs. The maximum number of TTYs does not change. Therefore, after youconfigure the maximum TTYs , no additional TTYs are supported.The MGC has three serial ports SDI0, SDI1, and SDI2.You can use serial ports for local debugging; or, you can configure the portsin the MG 1000B Call Server as system terminals in LD 17.During the initial configuration of the MGC, you must connect to eitherSDI0 or SDI1 to access the installation menu. Only SDI0 has full modemsupport, as SDI1 and SDI2 have no hardware flow control (limitation ofthe three-port cable used).SDI2 is not available during the MGC bootup; therefore, you cannot useit to access the installation menus.Unlike the NTDK20xx SSC card, all SDI ports on the MGC are configuredby using shipped software. No DIP switches are on the MGC for configuringthe baud rate of SDI0.Single CPU ImplicationsSingle CPU installations do not require dynamic binding of TTY ports tothe active CPU because only one CPU exists. Therefore, single-CPUinstallations can use the Call Server TTY ports or the MGC remote TTYports.Dual CPU ImplicationsMG 1000B uses a terminal server to ensure that serial ports are alwaysbound to the active CPU. The remote SDIs on the MGC provide similarfunctionality. Each MGC provides three SDI ports that you can provisionin the softswitch as TTYs.Remote TTY provisioning is enhanced over the terminal server model. SDIport provisioning is performed on the softswitch and does not require localprovisioning at the IPMG.Terminal Server SupportThe remote SDI feature on the MGC eliminates the need for a terminalserver.Nortel Communication Server 1000Branch Office Installation and CommissioningNN43001-314 01.02 StandardRelease 5.0 20 June 2007Copyright © 2007, Nortel Networks.
