Configuration Options
C-7
3162-A2-GB20-30 March 1999

Table C-3. Sync Data Port Configuration Options (2 of 5)

Embedded Data Link: Disable
Enable Disable
Specifies whether Embedded Data Link (EDL) is enabled for a particular port. If EDL is
enabled, then 8 kbps of the total bandwidth allocated for this port is not available to the
synchronous data port. For example, if the port rate is 256 kbps (4 DS0 channels
allocated) and EDL is enabled, then only 248 kbps is available to the port. EDL provides
the following: detection of frame synchronization, CRC of the data stream (excluding the
8 kbps EDL), and an in-band data link (4 kbps) between the local and remote units. The
4 kbps in-band data link can be used for performance report messages and as an IP
link for SNMP or Telnet sessions.
Enable – Indicates the port’s EDL is enabled.
Disable – Indicates the port’s EDL is disabled.
NOTES: – If the local DSU/CSU’s EDL is enabled, then the remote DSU/CSU’s
EDL must also be enabled.
– EDL is not recommended for networks in which data is examined for
routing purposes (e.g., frame relay, x.25).
EDL Management Link: Disable
Enable Disable
Specifies whether the EDL management link is enabled for a particular port. Selecting
Enable allows SNMP or Telnet traffic to flow over the 4 kbps in-band data link provided
by EDL.
Enable – Enables the port’s EDL management link.
Disable – Disables the port’s EDL management link.
NOTES: – This configuration option is not available if EDL is disabled or FDL is
enabled.
– If the local DSU/CSU’s EDL is enabled, then the remote device’s EDL
must also be enabled.
Invert Transmit Clock: Disable
Enable Disable
Specifies whether the clock supplied by the DSU/CSU on the TXC interchange circuit
DB (CCITT 114) is phase inverted with respect to the Transmitted Data interchange
circuit BA (CCITT 103). This configuration option is useful when long cable lengths
between the DSU/CSU and the DTE are causing data errors.
Enable – Indicates TXC supplied by the DSU/CSU on this port is phase inverted.
Disable – Indicates TXC supplied by the DSU/CSU on this port is not phase inverted.
Invert Transmit and Received Data: Disable
Enable Disable
Specifies whether the port’s transmitted data and received data are logically inverted
before being transmitted or received. This configuration option is useful for applications
where HDLC data is being transported. Inverting the data ensures that the density
requirements for the network interface are met.
Enable – Indicates the transmitted data and received data for this port are inverted.
Disable – Indicates the transmitted data and received data for this port are not inverted.