SDCP Operation3-173166-A2-GB20-20 March 1999The carrier COM port provides the following functionality: If configured for ASCII, only one ASCII device may be used for the carrier. (Iftwo COM ports are configured for ASCII, neither will work.) If configured for Mgmt, each device in the carrier can support a Mgmt COMport; however, each Mgmt COM port must be connected to a different subnet.To facilitate IP data routing, the device with the closest link to the SNMPmanager or Telnet client should be configured as the IP Bus Master. If configured for either ASCII or Mgmt, the carrier COM port may beconfigured to control an external device (e.g., modem, x.25 PAD) through theuse of AT or user-specified commands.The set of valid characters for control of the carrier external COM port device isas follows: The numbers: 0–9 The lowercase letters: a–z The uppercase letters: A–Z The space (“ ”) character The ASCII symbols (in ascending order, based on the ASCII code) The End Of Line (EOL) symbol: ← The caret (‘‘^”) control character is used to select non-printable ASCIIcharacters. The caret ‘‘^” must be followed by one character which togetherform the control sequence. Table 3-4 defines all of the available controlsequences.
