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Canopy T1/E1 Multiplexer
Table 11: Canopy BH20 Ethernet throughput for programmed T1/E1 connections
Active
T1/E1
Channels
1
2
3
4
* Due to the bandwidth limitations of the Canopy BH, only 3 E1 channels can be
used.
Note: The maximum packet rate in T1 mode is 666 packets/sec. The maximum packet
rate in E1 mode is 442 packets/sec.
1.5.6
VLAN Support
The Canopy T1/E1 Multiplexer fully supports customer VLAN traffic. The Canopy T1/E1
Multiplexer has an increased maximum Ethernet packet size of 1600 bytes. Typically,
the maximum packet size is 1518 bytes for Ethernet traffic, however VLAN traffic adds an
extra 4 bytes for the VLAN tag as in the 802.1Q protocol. In addition, some
manufacturers, such as Cisco, have proprietary VLAN applications that result in extra
long Ethernet packets.
1.5.7
Round‐Trip Packet Delay
The one-directional delay between the two T1/E1 endpoints would be approximately 20
milliseconds. This delay does not include any delay added by Canopy Backhaul Modules.
The Ethernet throughput delay is the time required for one Ethernet packet to pass
through the LAN port of the Canopy T1/E1 Multiplexer. The maximum one-directional
delay for an Ethernet packet of size 1518 Bytes is approximately 240 microseconds,
excuding the delay that Canopy BH modules introduce.
1.5.8
Alarms
The Canopy T1/E1 Multiplexer supports the Alarm Indication Signal (AIS). It is sent
under 2 conditions: a loss of incoming T1/E1 signal (in which case AIS is sent out to the
far end and the same for the other end losing T1/E1 signal) and a loss of BH link (in
which case the AIS is sent in both directions).
Issue 1
Ethernet Half-duplex
Throughput on LAN
Port in T1 mode.
7.2 Mbps
5.0 Mbps
2.6 Mbps
250 Kbps
T1/E1 Multiplexer Release 3.1
Ethernet Half-duplex
Throughput on LAN
Port in E1 mode.
6.4 Mbps
3.2 Mbps
254 Kbps
N/A*
June 2004
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