5-3
Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5
78-18133-01
Chapter 5 Configuring POS on the ML-Series Card
Configuring the POS Interface
• Path-level alarms and conditions, including loss of pointer (LOP), unequipped (UNEQ-P), payload
mismatch (PLM-P), alarm indication signal (AIS) detection, and remote defect in dication (RDI)
• J1 path trace for high-order paths

Framing Mode, Encapsulation, Scrambling, MTU and CRC Support

The ML-Series card on the ONS 15310-CL and ONS 15310-M A supports high-level data link control
(HDLC) framing and frame-mapped generic framing procedur e (GFP-F) framing. Supported
encapsulation and cyclic redundancy check (CRC) sizes for the framing types are detailed in Tab le 5 -2.
LEX is the common term for Cisco-EoS-LEX, which is a proprietary Cisco Ethernet-over-SONET
encapsulation. This encapsulation is available on most ONS Ethernet cards. When the ML-Series card
is configured for GFP-F framing, the LEX encapsulation is in accordance with ITU-T G.7041 as
standard mapped Ethernet over GFP. Under GFP-F framing, the Cisco IOS CLI also uses this lex
keyword to represent standard mapped Ethernet over GFP-F.
LEX encapsulation is the required and default encapsulation for RPR on the ML-Series card. The
maximum transmission unit (MTU) size is not configurable and is set at a 1500-byte maximu m (standard
Ethernet MTU). In addition, the ML-Series card suppo rts baby giant frames in which the standard
Ethernet frame is augmented by IEEE 802.1 Q tags or Multiprotocol Label Switching (MPLS) tags. It
does not support full Jumbo frames.
The ML-Series card supports GFP null mode. GFP-F client -management frames (CMFs) are counted a nd
discarded.
The ML-100T-8 card is interoperable with the ONS 15310-C L and ONS 15310-MA CE-100 T-8 card and
several other ONS Ethernet cards. For specific details on the ONS 15310-CL and ONS 15310-MA
CE-100T-8 card’s encapsulation, framing, and CRC, see Chapter 17, “CE-100T-8 Ethernet Operation.”
For specific details on interoperability with other ONS system Ethernet cards, including framing mode,
encapsulation, and CRC, refer to the “POS on ONS Ethernet Cards” ch apter of the Cisco ONS 15454
and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide.
Configuring the POS Interface
The user can configure framing mode, encapsulation, and Cisco IOS SONET alarm re porting parameters
through Cisco IOS.
Table 5-2 ML-Series Card Encapsulation, Framing, and CRC Sizes
GFP-F Framing HDLC Framing
Encapsulations LEX (default)1
Cisco HDLC
PPP/BCP
1. RPR requires LEX encapsulation in either framing mode.
LEX (default)
CRC Sizes 32-bit (default) 32-bit (default)
None (FCS disabled)