M7/M7L/M7LT Modular Satellite Modem Maintenance
M7/M7L/M7LT - Rev. 0.05 3-95
3.8.2.5. Modem Control Channel (MCC)
The E7 interface provides an in-band management channel that allows communications over the
satellite link to the modem(s) at the distant end. Activation for read/write capability over the MCC is
set in menu item <Intf: MCC Mode = Full Access>. The default setting for the MCC mode is
“Disable” and limited access is set by “Read Only” configuration. The MCC addresses and bit rate
limits are set in menu items <Intf: MCC Send Address>, <Intf: MCC Rcv Address>, and <Intf:
MCC Send Rate Limit>.
3.8.2.6. Test Modes and Statistics
The E7 offers loopback modes for link verification prior to running live traffic or for troubleshooting.
Loop back of Ethernet traffic can cause considerable problems within a network but the E7 design
resolves all of these issues and allows proper loopback testing. Loopback functions are set in menu
item <Intf: Test Sat WAN Loopback > for over the satellite testing and menu item <Intf: Test Ter
WAN Loopback > for local interface checkout.
The E7 provides extensive live statistics of the link performance. Statistics on Packets per Second
(PPS) sent and received, number of data, MCC, and idle packets and Bytes sent and received, the
percentage of the link that contains data, MCC, or idle packets, and total packets sent and received.
There is also a count of the total errored packets and the packet error rate. These statistics are
displayed in the <Intf: Stats Send Data> and <Intf: Stats Rcv Data> menu items. The send and
receive statistic counters can be independently reset in any of the menu items by pressing the “Edit”
and then the “Enter” keys on the front panel.
NOTE: When the <Intf: Send WAN Protocol = M7 HDLC> Idle Packets are inserted into the send bit
stream, up to the WAN throughput data rate, when there are no valid packets of either Data
or MCC. No Idle packets will be inserted when the <Intf: Send WAN Protocol = M500
HDLC>.
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