# What is the rate of the 1E1T1-M interface of AR2220?

35

The rate of the E1 interface of an AR router is described as follows:

The maximum rate of an E1 interface can be calculated as follows: 32 (timeslots) x 64 (kbit/s per timeslot) = 2.048 Mbit/s
If timeslots are divided and timeslot 0 is used to transfer synchronization information:
- CE1: Except for timeslot 0, a CE1 interface includes 31 timeslots. Therefore, the maximum rate of a CE1 interface can be calculated as follows: 31 (timeslots) x 64 (kbit/s per timeslot) = 1.984 Mbit/s The maximum rate is determined by the number of timeslots that are bundled.
- PRI: Except for timeslot 0, and timeslot 16 that is used to transfer control signal, a PRI interface includes 30 timeslots that can transmit service data. Therefore the maximum rate of a PRI interface can be calculated as follows: 30 (timeslots) x 64 (kbit/s per timeslot) = 1.920 Mbit/s.

###### Other related questions:
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.

Why traffic forwarding fails when interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards are added to an MP-group and the maximum MTU of the interfaces is set to 1596 bytes
After interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards are added to an MP-Group, the interfaces add a 4-byte MP packet header to a 1596-byte IP packet before sending it. As a result, the total packet length exceeds the maximum MTU of the interfaces, 1596 bytes. Consequently, traffic forwarding fails. In this scenario, you are advised to set the MTU of the interfaces on the 1E1T1-M/2E1T1-M/1E1T1-F/2E1T1-F interface cards to 1592 bytes.

Rate of uplink interfaces on S series fixed switches
The S2700 and S3700 provide GE uplink interfaces. The S1720, S600, and S5700 provide GE or 10GE uplink interfaces, depending on the model. The S6700EI provides 10GE uplink and downlink interfaces. The S6720EI and S6720S-EI provide 40GE uplink interfaces.

Service interfaces of the OceanStor 9000 V100R001C01 M node
The OceanStor 9000 V100R001C01 M node has the following service interfaces: two 10GE optical ports and four GE ports.

###### If you have more questions, you can seek help from following ways:
To iKnow To Live Chat