23-2
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 23 E-Series and G-Series Ethernet Operation
G1K-4 and G1000-4 Comparison
• High availability (HA), including hitless (< 50 ms) performance with software upgrades and all
types of SONET/SDH equipment protection switches
• Hitless reprovisioning
• Support of Gigabit Ethernet traffic at full line rate
• Full TL1-based provisioning capability
• Serviceability options including enhanced port states, terminal and facility loopback, and J1 path
trace
• SONET/SDH-style alarm support
• Ethernet performance monitoring (PM) and remote monitoring (RMON) functions
The G-Series cards allow you to provision and manage an Ethernet private line service like a traditional
SONET or SDH line. G-Series card applications include providing carrier-grade transparent LAN
services (TLS), 100-Mbps Ethernet private line services (when combined with an external 100-Mb
Ethernet switch with Gigabit uplinks), and high-availability transport.
On the ONS 15454 or ONS 15327, the card maps a single Ethernet port to a single ST S circuit. You can
independently map the four ports on a G-Series card to any combination of STS-1, STS-3c, STS-6c,
STS-9c, STS-12c, STS-24c, and STS-48c circuit sizes, provided that the sum of the circuit sizes that
terminate on a card do not exceed STS-48c.
On the ONS 15454 SDH, the cards map a single Ethernet port to a single STM circuit. You can
independently map the four ports on the G-Series card to a ny combination of VC4, VC4-2c, VC4-3c,
VC4-4c, VC4-8c, and VC4-16c circuit sizes, provided the sum of the circuit sizes that terminate on a
card do not exceed VC4-16c.
To support a Gigabit Ethernet port at full line rate, an STS/VC4 circuit with a capacity greater or equal
to 1 Gbps (bidirectional 2 Gbps) is needed. An STS-24c/VC4-8c is the minimum circuit size that can
support a Gigabit Ethernet port at full line rate. A G-Series card supports a maximum of two ports at full
line rate.
The G-Series transmits and monitors the J1 Path Trace byte in the same manner as OC-N/STM-N cards.
For more information, see the appropriate platform reference book, eith er ONS 15454 Reference
Manual, ONS 15454 SDH Reference Manual, or ONS 15327 Reference Manual.
Note The G-Series uses LEX encapsulation. LEX is standard high-level data link control (HDLC) framing
over SONET/SDH as described in RFC 1622 and RFC 2615, with the Point-to-Point Protocol (PPP) field
set to the value specified in RFC 1841. For more information on LEX, see Chapter 20, “POS on ONS
Ethernet Cards.”
G1K-4 and G1000-4 Comparison
The G1K-4 and the G1000-4 cards comprise the ONS 15454/ONS 15454 SDH G-Series. The G1K-4 is
the hardware equivalent of the earlier G1000-4.
When installed in ONS 15454s running Software Release 3.4 and earlier, both cards require the XC10G
card to operate. However, when installed on an ONS 15454 running Software R4.0 and later, the G1K-4
card is not limited to installation in ONS 15454s with XC10G cards but can also be installed in
ONS 15454s with XC and XCVT cards. When used with XC and XCVT cards on an ONS 1545 4 running
Software R4.0 and later, the G1K-4 is limited to Slots 5, 6, 12, and 13.
These constraints do not apply to a G-Series card configured for Gigabit Ethernet Transponder Mode;
see the “G-Series Gigabit Ethernet Transponder Mode” section on page 23-8 for more information.