Nortel Networks 8000 - Manual (Page 68)

Nortel Secure Router 8000 Series
Configuration -WAN Access 4 POS and CPOS interface configuration
Channelization and unchannelization
In the framed mode, channelization transmits multiple paths of data over a piece of optical
fiber by using low speed tributary signals of STN-N signals. One path of data is called a
channel. During transmission, each channel has its own bandwidth, start and end points, and
monitoring policies.
In the framed mode, unchannelization transmits all data in a single channel over a piece of
optical fiber by using all STM-N signals. During transmission, all the data has the same ID,
star and end points, and follows the same monitoring policy.
The clear channelization, also called the non-framed mode, refers to the mode where there is
no signal to identify the frames in the data code stream, and any bit in the code stream is data.
The data in the code stream can only belong to one channel.
Channelization can utilize the bandwidth to transmit paths of low speed signals.
CPOS Interface types
The CPOS interface cards supported by SR8000 are as follows:
• FIC low-speed interface module
- 1-port channelized POS/155M optical module (1CPOS(E))
• HIC high-speed interface module
- 1-port channelized POS/155M optical interface E1 module (RTP1CPE1)
- 1-port channelized POS/155M optical interface T1 module (RTP1CPT1)
A
• SR8012 supports only RTP1CPE1 and RTP1CPT1 interface cards.
• When the E1/T1 channelized by the RTP1CPE1 and RTP1CPT1 works in the clear
channel (unframed) mode, you can carry out the MP binding. In addition, you can only
carry out the MP binding within the card. The E1/T1 channel does not support binding
with those on the other low-speed cards.
• The CPOS E1/T1 (HIC) interface supports only the equal-speed binding and binding
within the CPOS card, and it does not support the binding with the low-speed cards. It
supports framed binding.
Table 4-1 describes the synchronous serial interface channelized by the CPOS interface card
supporting the link layer on the SR8000.
Table 4-1 Description of the link layer of the CPOS interface card and channel
Interface
Card Link Layer Protocol MP Binding
1CPOS(E) PPP, HDLC, FR,
LAPB, X.25, and
SDLC
Supports each MP binding supports a maximum of
12 channels, and the maximum number of bindings
is 32.
Issue 5.3 (30 March 2009) Nortel Networks Inc. 4-7