MX2820 System Manual7-116 61186003L1-1D16. From the Network Provisioning menu, select DS2 #1 M ODE.Input a value of 1 or 2 to select the desired setting, and press E NTER.1 - M12 <4xT1>2 - G.747 <3xE1>NOTEThe MX2820 system can individually frame each of the seven DS2streams in M12 (four T1s) format or G.747 (three E1s) format.When set to M12 (4xT1) format, the four T1s for the selected groupare framed per ANSI T1.107. When set to G.747 (3xE1) format, thefirst three T1/E1 ports of the selected group are framed per CCITTG.747 into the DS3 stream. The fourth T1/E1 port of the selectedgroup is not available in this mode. Any combination of M12 andG.747 is allowed. This note applies to Step 15.17. Repeat step 16 for the remaining DS2 #n Modes, pressing Enter after each option setting.18. From the Network Provisioning menu, select DS3 E QUIPMENT IDENTIFICATION.Figure 7-29 shows the DS3 Equipment Identification menu screen. These fields provideuser-configurable text strings to identify the MX2820 system over the network. The NearEnd Location ID Code, Near End Frame ID Code, and Near End Equipment Code fieldssupport up to ten alphanumeric characters. The Near End Facility ID Code supports up to38 characters. The Near End Unit Code supports up to six characters. The Far-End fieldsare read-only.Table 7-6. MTU Datagram SizeMTU Size Description260 This value sets the maximum IP datagram size to 260 bytes. All ADTRAN MX2820and MX2800 systems that support IP forwarding are compatible with this MTUvalue. Therefore, this is the preferred setting when the IP Forwarding Protocol modeis set for ADTRAN.1500 This value sets the maximum IP datagram size to 1500 bytes. This is the preferredvalue when the IP Forwarding Protocol mode is set to PPP. If the IP Forwarding Proto-col is set for ADTRAN, then the IP Forwarding MTU should only be set to 1500 whenthat same value can be set on both ends of the DS3 facility.NOTEIf one of the ADTRAN devices does not have an IP Forwarding MTU setting (as in anolder module) then the other end should be set for 260 in order to avoid lost packets.
