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Configuring Cryptographic Resynchronization (Crypto Resync)

 

You can use the CTP chassis with cryptographic devices. You can configure synchronized (in-sync) and pulse cryptographic resynchronized (resync) options for use with these devices.

If an error occurs on a secure link, the cryptographic devices can get out of sync. When the CTP software detects that a cryptographic device is out of sync or that keepalives or LMI has been lost, it signals to the cryptographic device to resync by pulsing DSR and/or CTS.

The NRZ port has a configuration parameter for cryptographic resynchronization where you need to specify a port that is on the same node and is monitored. The port has to be a Fractional T1/E1 port that has Frame transport Enabled. When the bundle that includes these ports is up and running, the cryptographic resynchronization function monitors the frame synchronization bit of the framer in the east bound direction, and if the framer indicates loss of frame, then the cryptographic function is activated.

You can configure how long the CTP software waits before requesting a resynchronization, set the pulse width, and set the pulse period of the resynchronization request. You can also configure the direction of the pulse (0 to 1 or 1 to 0). To disable the pulse, set the in-sync and pulse value to the same value.

To configure cryptographic resynchronization:

  1. From the CTP Main Menu, select 1) Bundle Operations >
  2. Select 1) CTP.
  3. Select a bundle from the list.
  4. Select 3) Port Config > 4) Advanced Options > 11) Remote Port T1E1 crypto
  5. Enter y and select a T1E1 port when prompted..
  6. 12) Crypto Options
  7. Configure the cryptographic resynchronization options as described in Table 1

    Table 1: Cryptographic Resynchronization Options

    Field Name

    Field Description

    Crypto resync wait time

    Number of seconds to wait between loss of sync on the port and the first resynchronization pulse.

    Enter a value in the range 1 – 60. The default value is 4 seconds

    Crypto resync pulse width

    Pulse width in seconds. This is the number of seconds the resynchronization pulse will be asserted.

    Enter a value in the range 1 -15. the default value is 1 second

    Crypto resync pulse period

    Number of seconds between the beginning of each pulse. This value minus the pulse width equals the time between the end of one pulse and the beginning of the next pulse.

    Enter a value in the range 1-1000. The default value is 8 seconds.

    Crypto resync DSR in-sync value

    State of DSR or DTR when the port is in sync.

    Enter a value in the range 0-1. The default value is 1.

    Crypto resync DSR pulse value

    State of DSR or DTR to be sent between the resynchronization pulses when the port is out of sync.

    Enter a value in the range 0-1. The default value is 0.

    Crypto resync CTS in-sync value

    State of CTS or RTS when the port is in sync.

    Enter a value in the range 0-1. The default value is 1.

    Crypto resync CTS pulse value

    State for CTS or RTS to be sent between the resynchronization pulses when the port is out of sync.

    Enter a value in the range 0-1. The default value is 0.