igPrimaryEocTmcDs1IfIndex

For systems that support more than one DS1, 
protection switching for the Embedded Operations 
Channel (EOC) and a Time-slot Management Channel 
(TMC) is mandatory.  
              
This object refers to the ifIndex for the DS1 
line supporting the active EOC and TMC path 
protection switching.  The value for this object 
is equal to the value of ifIndex from the 
Interfaces table of MIB II (RFC 1213).
              
Per-call time-slot assignment is accomplished 
over a 64 kb/s TMC that carries mesages between 
the LDS and RDT.  These messages are used to make
and break time-slot assignments between line
units and DS0s on a per-call basis.
              
A separate DS0 data link, called the Embedded 
Operations Channel (EOC), is used to transmit
operations messages between RDT and LDS/OSs.
              
The initial protection channel for the EOC is 
channel number 12 of a DS1 and channel number 
24 on the same DS1 is reserved for TMC 
protection.  Note that GR-303-CORE states that 
protection switching for DS1 lines is optional.
              
GR-303-CORE R5-263 [1835] An RDT and an IDT 
shall support EOC and TMC/CSC path protection 
switching on systems supporting more than one DS1.
              
R5-264 [505] An RDT and an IDT shall receive 
from a remote managing system and process 
retrieval of time slots for the second EOC 
(i.e., the initial standby) and the second TMC 
or CSC.
              
R5-266 [507] An RDT and an IDT shall receive 
from a remote managing system and process 
requests to assign and to retrieve the DS1 line 
for the standby EOC and the standby TMC/CSC.
              
The value will be zero if the Interface Group
is not installed on a specific card.

MIB

ZhoneGR303-MIB

OID

.1.3.6.1.4.1.5504.4.3.1.1.1.7

Type

column

Access

readonly

Status

current

Parent

interfaceGroupEntry