Interface Configuration
7750 SR Interface Configuration Guide Page 175
Configuration Notes
The following information describes provisioning caveats:
• If a card or MDA type is installed in a slot provisioned for a different type, the card will
not initialize.
• A card and MDA installed in an unprovisioned slot remain administratively and
operationally down until the card type and MDA is specified.
• Ports cannot be provisioned until the slot, card and MDA type are specified.
• cHDLC does not support HDLC windowing features, nor other HDLC frame types such
as S-frames.
• cHDLC operates in the HDLC Asynchronous Balanced Mode (ABM) of operation.
• APS configuration rules:
→ A physical port (either working or protection) must be shutdown before
it can be removed from an APS group port.
→ For a single-chassis APS group, a working port must be added first. Then a protection
port can be added or removed at any time.
→ A protection port must be shutdown before being removed from an APS group.
→ A path cannot be configured on a port before the port is added to an APS group.
→ A working port cannot be removed from an APS group until the APS port path is
removed.
→ When ports are added to an APS group, all path-level configurations are available
only on the APS port level and configuration on the physical member ports are
blocked.
→ For APS-protected bundles, all members of a working bundle must reside on the
working port of an APS group. Similarly all members of a protecting bundle must
reside on the protecting circuit of that APS group.
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