Metrodata FM4900, User Manual

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CONFIGURING THE FM4900
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6. 4 WAN (Line) Port Set-up Menu
The menu is shown below for each operating mode.
G.751 Framed mode Unframed mode
Figure 6. 11 WAN Port set-up menus
6 . 4. 1 Framing
This option can be set to either G.751 or UNFRAMED mode.
If UNFRAMED mode is selected 34
.
368 Mbps of bandwidth is available to the DTE.
If G.751 framed mode is selected 34
.
100 Mbps of bandwidth is available to the DTE.
6 . 4. 2 Line coding
This setting cannot be altered, and is for information only. The value is HDB3 (High Density
Binary 3).
6 . 4. 3 Timing
This details the clocking employed in the FM4900, and the values are INTERNAL and
LOOP .
The E3 Line TX clock is derived from the DTE using CCT 113 (TT: terminal timing). The HSSI
specification requires this signal to be a non-gated version of CCT 114 (ST: send timing).
The E3 Line Rx clock is always used to generate the CCT 115 timing (RT: receive timing).
We recommend that one end is set to INTERNAL timing and the other end is set to LOOP
timing, although they will operate with both set to INTERNAL timing.
The units may operate with both set to LOOP timing but this is not recommended. The
clocking diagram is shown in Figure 6.11 below.
WAN PORT SET-UP WAN PORT SET-UP
Framing G.751 Framing Unframed
Line coding HDB3 Line coding HDB3
Timing Internal Timing Internal
data-linK On aIs detection Enabled