Motorola APEX1000 Installation And Operation Manual page 136

Window Section
GigE Global
GigE Interface
Settings
Configuration • GigE Configuration
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
GigE Configuration window field definitions
Definition/Range
GARP Gratuitous ARP requests can help detect IP conflicts that could
Periodicity (s)
happen after an APEX1000 is swapped out, for example. Devices
(such as switches) on the network with the sender's IP address in
their bridge table/cache should update their bridge table/cache with
the new mapping.
The APEX1000 sends a GARP (Gratuitous ARP) request on bootup
(or if an IP address is changed) to detect duplicate IP addresses and
advertise a new MAC address associated with an IP address. This
value indicates the periodicity of these requests.
The default value is 150.
Nominal Buffer This value indicates the delay generated when MPEG transport
Level (ms) packets are transmitted over Ethernet. This allows the APEX to
properly de-jitter an input stream. De-jittering takes into account
normal network jitter, clock skew between the source and APEX,
and also time between PCR packets.
Range: 50 – 475 ms (in 5 ms steps)
The default is 325 ms. This value has been defined as the optimal
time for the APEX to allow for the input buffers to grow and shrink.
Motorola highly recommends that you not change this value.
Changes to this value cause all input stream buffers to be reset,
resulting in a momentary loss of data.
Enable Enables or disables a GigE interface (GigE 1 through GigE 4).
MAC Address
Shows the MAC address of the APEX GigE interface.
IP Address This is the IP address of the APEX GigE interface.
Motorola highly recommends that you configure each GigE interface
on a separate subnet.
The GigE network stack contains a single routing table. Therefore,
each GigE interface should be on a separate network. If configured
on the same network, responses to pings (ICMP) will be
transmitted out the primary interface.
Given that the APEX contains two GigE processors (one processor
for GigE 1–2 and a second processor for GigE 3–4), GigE 1 and GigE
3 are the primary interfaces. This means that if you configure GigE 1
and 2 on the same subnet, a ping received on the GigE 2 interface
will result in a reply being sent out on GigE 1. The same occurs for
GigE 3 and 4, respectively. To avoid this condition, you should
configure each GigE interface on a separate network.
Subnet Mask
Indicates the network address and host ID portion of the IP address.
Auto Indicates whether Auto Negotiation is Enabled or Disabled. Auto
Negotiation
Negotiation is always enabled within the network stack. (The GigE
interfaces can only function at 1000/Full.)
B
118