Be not deceived, my brethren: If anyone follows a maker of schism [i.e., is a schismatic], he does not inherit the kingdom of God; if anyone walks in strange doctrine [i.e., is a heretic], he has no part in the Passion [of Christ]. Take care, then, to use one Eucharist, so that whatever you do, you do according to God: For there is one flesh of our Lord Jesus Christ, and one cup in the union of his blood; one altar, as there is one bishop, with the presbytery and my fellow servants, the deacons (Letter to the Philadelphians 3:3-4:1 [A.D. 110]).
St Ignatius taught that there is only one alter and one bishop in the letter to the Phiadelphians.( There should be a number of bishops with equal status in Church, not only one bishop which is infalliable has special authority, like catholic church!!

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What does 'ONE alter' and 'ONE bishop' mean in the letter to Phildeplphians? How do Orthodox Christians understand 'One altar' and 'one bishop'?