How to AR routers support E1/T1 cards

E1/T1 cards that AR routers support are described as follows:

1. 1E1T1-M/2E1T1-M/4E1T1-M/8E1T1-M equipped with 1 interface or /2/4/8 interfaces support the switching use of E1 and T1. Cards equipped with 4 or 8 interfaces do not support T1 currently.
- Cards equipped with 1 interface or 2 interfaces use the DB9 female connector interface and support E1/CE1/CT1/PRI(E1&T1) modes.
- Cards equipped with 4/8 interfaces use the RJ45 interface and support E1/CE1/PRI(E1) modes.

2. 1E1T1-F/2E1T1-F/4E1T1-F/8E1T1-F equipped with 1 interface or /2/4/8 interfaces support the switching use of E1 and T1. Cards equipped with 4 or 8 interfaces do not support T1 currently.
- Cards equipped with 1 interface or 2 interfaces use the DB9 female connector interface and support E1 (framed and unframed) and T1 modes.
- Cards equipped with 4/8 interfaces use the RJ45 interface and support E1 (framed and unframed) mode.

3. 4E1-IMA, which is used on ATM networks, demultiplexes an aggregate ATM cell flow into multiple lower-speed E1 links, and multiplexes the E1 links on the far end to restore the original aggregate ATM cell flow.

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