Exalt Installation and Management Guide
ExtendAir (TDD) Series
203591-004
17
2010-09-20
channel spacing may accommodate this configuration. Asymmetry is, however, ideal for single-hop,
multi-link hub/spoke architectures, or simply single independent links.
TDD frame sizes of 2ms and 5ms are supported. The 5ms configuration maximizes the aggregate
throughput of the radio for every situation. The 2ms configuration reduces latency to meet latency-
critical applications, especially for multi-link and TDM circuit support. The following RF BW/mode
combinations are supported for these two configurations:
•
16MHz/Mode1 (called 20MHz/Mode1 for some regulatory domains)
•
16MHz/Mode2 (called 20MHz/Mode 2 for some regulatory domains)
•
16MHz/Mode 3 (called 20MHz/Mode 3 for some regulatory domains)
•
32MHz/Mode1 (called 40MHz/Mode 1 for some regulatory domains)
•
32MHz/Mode2 (called 40MHz/Mode 2 for some regulatory domains)
•
32MHz/Mode 3 (called 40MHz/Mode 3 for some regulatory domains)
The following Tx/Rx ratios are supported for these two configurations:
•
65/35 and 35/65
•
80/20 and 20/80
For example, a radio configuration of 32MHz/Mode2 with a 5ms TDD frame size supports up to
110Mbps user capacity or 55Mbps full-duplex. By selecting 80/20 on one side of the link and 20/80 on
the other side, the radio allows up to 88Mbps in one direction, and 22Mbps in the opposite direction.
T1/E1 is supported with asymmetric settings. However, based on the BW/mode setting (and in some
cases, TDD frame size and distance), the direction with the limited throughput limits the number of T1
or E1 connections obtained. For example, the 16MHz/Mode1 setting typically supports up to 27Mbps
aggregate throughput. In the 80/20 ratio configuration, one direction is limited to 5.4Mbps, which is
less than 3xE1 and less than 4xT1. Since TDM connections must be symmetrical, this setting therefore
limits throughput to no more than 2xE1 or 3xT1.
Simple Network Management Protocol (SNMP)
The Exalt radios primarily use a browser-based graphical user interface (GUI) for radio configuration
and management, as described in
Exalt Graphical User Interface (GUI)
. In addition, a command line
interface (CLI) is provided for serial and/or Telnet access, as described in
. SNMP is often used for management of larger networks as described here. Use SNMP to
manage networked devices and execute the following functions:
•
GET: Obtain information from the device, such as a configuration setting or parameter.
•
SET: Change a configuration setting on the device.
•
TRAP: The device proactively informs the management station of a change of state, usually used
for critical alarms or warnings.
Note:
Asymmetry is only supported for a specific subset of system configurations that are
optimized for typical asymmetric applications.
Note:
GPS sync is supported with asymmetric settings, but in addition to the other
requirements for sync, all radios tied to sync must be set with matching ratios.
