Avaya Configuring WAN Lines Services Instrukcja Użytkownika Strona 132

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Configuring WAN Line Services
6-10
308648-14.00 Rev 00
Enabling or Disabling E1 Services
By default, the router enables E1 line services when you add the interface. You
can disable or reenable this interface without moving the cables.
See the Enable parameter on page A-10 for information.
Enabling or Disabling CRC
Some E1 equipment expects a 4-byte CRC trailer at the end of each frame.
By default, the CRC trailer is not added to received E1 frames. Set the Line Type
parameter to E1CRC4 if the E1 equipment expects a 4-byte CRC trailer at the end
of each frame.
See the Line Type parameter on page A-12 for information.
Enabling or Disabling High-Density Bipolar Coding (HDB3S)
E1 uses bipolar format for signals. In bipolar format, alternating positive and
negative pulses on the digital line signify the number 1, and the absence of a pulse
signifies 0 (see Figure 6-2
on page 6-5).
A long string of zeros on an E1 line would cause the line to lose synchronization
due to lack of pulses. For synchronization, Nortel Networks provides HDB3S,
which is a mechanism to maintain sufficient 1s density in the E1 data stream.
HDB3S support is disabled by default. You can enable or disable HDB3S on this
interface, depending on the ability of the associated E1 equipment to support
HDB3S.
See the HDB3S Support parameter on page A-11 for information.
Setting the Clock Source
The E1 equipment associated with an E1 interface must use a compatible transmit
clock. The E1 interface supports three sources for the transmit clock:
Internal -- Indicates that the router sets the clock
Slave -- Indicates that the incoming data stream sets the clock
Manual -- Indicates that jumpers on the E1 link module set the clock
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