The DS1/E1 tributary interfaces transmit and receive a standard electrical DS1/E1 signal. DS1 signals are as specified in GR-499-CORE (1.544 Mb/s nominal rate, DSX-1 interconnect specification). E1 signals are as specified in ITU G.703, G.704, G.706, G.736, G.775, M.2100 (120-Ohm termination, 2.048 Mb/s nominal rate, DSX-1 interconnect specification).
The VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62, and VLNC64 framing format can be set to SF, ESF, and UF (unframed) for the DS1 ports. Interfaces used in ML-PPP mode cannot be unframed. DS1 line coding (VLNC50/52/55 and VLNC60/61/62) is provisioned per DS1 port to alternate mark inversion (AMI) or AMI with bipolar 8-zero substitution (B8ZS).
The VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62, and VLNC64 framing format can be set to FAS or CRC-4, and a line code of HDB3.
The following parameters are monitored on the VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62, and VLNC64 DS1/E1 interfaces:
Loss of signal (LOS): VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62
Loss of frame (LOF): VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62, VLNC64
Alarm Indication Signal (AIS): VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62, VLNC64
Bit error rate threshold (BER) based on line coding violations (CV-L): VLNC50, VLNC52, VLNC55, VLNC60, VLNC61,VLNC62.
The alarm level for the monitored parameters can be provisioned to critical (CR), major (MJ), minor (MN), or status.
Coding violation failure thresholds are provisionable.
The valid values for the VLNC50/52/55 are 10−3, 10−6, 10−7, 10−8
The valid values for the VLNC60/61/62 are 10−4, 5 x 10−4, 5 x 10−5, 10−6, 5 x 10−6, 10−7, 10−8
When transmitting the DS1/E1 signals to a DSX panel, the Approximate Span Length is 655 feet.
The following loopbacks are supported on the VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62 circuit packs:
The following loopbacks are supported on the VLNC64 circuit pack:
loopback-eth (loopback toward the Ethernet packet network)
loopback-opt (loopback toward the optical OC-3/STM-1)
Line build-outs are software-provisionable for VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62; LBOs do not apply to the portless VLNC64 packs. The maximum distance depends on the cable type. The maximum cable length for DS1/E1 lines is 655 feet.
For a detailed list of PM parameters and thresholds, refer to DS1 performance monitoring parameters and E1 performance parameters in Chapter 5, Operations, administration, maintenance, and provisioning.
| Copyright © 2011 Alcatel-Lucent. All rights reserved. |