Interface Configuration
7750 SR Interface Configuration Guide Page 375
The no form of this command removes the working-circuit. The working circuit can only be removed from
the configuration after the protect circuit has been removed.
Default none
Parameters port-id — Specify the physical port that will act as the working circuit for this APS group.
Syntax: port-id: slot/mda/port
numberSpecify in
Syntax: number: 1-2
Modifying Hold-Down Timer Values
Note that for APS configurations, the hold-time down and hold-time up default values are 100 ms and 500
ms respectively. But, if there is a large difference in the transmission delay between the APS working
(working-circuit) and protect line (protect-circuit), it is highly suggested to increase the default timer on
the working line accordingly with the transmission delay present on the protect line. See hold-time on
page 456.
The following output shows an example of the timers on POS interfaces.
A:NS044050253# show port aps-1
===============================================================================
SONET/SDH Interface
===============================================================================
Description : APS Group
Interface : aps-1 Speed : oc3
Admin Status : up Oper Status : up
Physical Link : Yes Loopback Mode : none
Single Fiber Mode : No
Clock Source : node Framing : sonet
Last State Change : 04/11/2007 13:53:01 Port IfIndex : 1358987264
J0 String : 2/1/5 7750-SR-7 Section Trace Mode : string
Rx S1 Byte : 0x00 (stu) Rx K1/K2 Byte : 0x00/0x00
Tx S1 Byte : 0x0f (dnu) Tx DUS/DNU : disabled
Rx J0 String (Hex) : 81 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Cfg Alarm : loc lais lrdi ss1f lb2er-sd lb2er-sf slof slos lrei
Alarm Status :
Hold time up : 500 milliseconds
Hold time down : 100 milliseconds
===============================================================================
Port Statistics
=============================================================================== Input
Output
-------------------------------------------------------------------------------
Packets 6670498 3804661
Discards 0 0
Unknown Proto Discards 0
===============================================================================
A:NS044050253#
For unprotected port these timer are different:
A:NS044050253# show port 2/2/2
===============================================================================
SONET/SDH Interface
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